Request validation and resilience improvements (#864)

### Security: Input validation & path safety
- **Reject local file references by default** in package parsing — only allow when explicitly opted in by the service (`ParseFlags::kAllowLocalReferences`) and validated by an `ILocalRefPolicy` (fail-closed: no policy = rejected)
- **`DataRootLocalRefPolicy`** restricts local ref paths to the server's data root via canonical path prefix matching
- **Validate attachment hashes** in compute HTTP handlers — decompresses and re-hashes each attachment at ingestion time to reject tampered payloads
- **Path traversal validation** for worker descriptions (`pathvalidation.h`) — rejects absolute paths, `..` components, Windows reserved device names, and invalid filename characters
- **Harden CbPackage parsing** against corrupt inputs — overflow-safe attachment count, bounds checks on local ref offset/size, graceful failure instead of `ZEN_ASSERT` for untrusted data
- **Harden legacy package parser** — reject zero-size binary fields, missing mappers, and optionally validate resolved attachment hashes
- **Bounds check in `CbPackageReader::MarshalLocalChunkReference`** — detect when `MakeFromFile` silently clamps offset+size to file size

### Reliability: Lock consolidation & bug fixes
- **Consolidate three action map locks into one** (`m_ActionMapLock`) — eliminates deadlock risk from multi-lock ordering, simplifies state transitions, and fixes a race where newly enqueued actions were briefly invisible to `GetActionResult`/`FindActionResult`
- **Fix infinite loop in `BaseRunnerGroup::SubmitActions`** when actions exceed total runner capacity — cap round-robin at `TotalCapacity` and default unassigned results to "No capacity"
- **Fix `MakeSafeAbsolutePathInPlace` for UNC paths** — `\server\share` now correctly becomes `\?\UNC\server\share` instead of `\?\server\share`
- **Fix `max_retries=0`** — previously fell through to the default of 3; now correctly means "no retries"

### New: ManagedProcessRunner
- Cross-platform process runner backed by `SubprocessManager` — uses async exit callbacks instead of polling, delegates CPU/memory metrics to the manager's built-in sampler
- `ProcessGroup` (JobObject on Windows, process group on POSIX) for bulk cancellation on shutdown
- `--managed` flag on `zen exec inproc` to select this runner
- Refactored monitor thread lifecycle — `StartMonitorThread()` now called from derived constructors to avoid calling virtual functions from base constructor

### Process management
- **Suppress crash dialogs** via `JOB_OBJECT_UILIMIT_ERRORMODE` + `SEM_NOGPFAULTERRORBOX` in both `WindowsProcessRunner` and `JobObject::Initialize` — prevents WER/Dr. Watson modal dialogs from blocking the monitor thread
- **CREATE_SUSPENDED → AssignProcessToJobObject → ResumeThread** pattern in `WindowsProcessRunner` — ensures job object assignment before process execution
- **Move stdout/stderr callbacks to `Spawn()` parameters** in `SubprocessManager` — prevents race where early output could be missed before callback installation
- Consistent PID logging across all runner types

### Test infrastructure
- **`zentest-appstub`**: Added `Fail` (configurable exit code) and `Crash` (abort / nullptr deref) test functions
- **Compute integration tests**: exit code handling, auto-retry exhaustion, manual reschedule after failure, mixed success/failure queues, crash handling (abort + nullptr), crash auto-retry, immediate query visibility after enqueue
- **Package format tests**: truncated header, bad magic, attachment count overflow, truncated data, local ref rejection/acceptance, policy enforcement (inside/outside root, traversal, no-policy fail-closed)
- **Legacy package parser tests**: empty input, zero-size binary, hash resolution with/without mapper, hash mismatch detection
- **UNC path tests** for `MakeSafeAbsolutePath`

### Misc
- ANSI color helper macros (`ZEN_RED`, `ZEN_BRIGHT_WHITE`, etc.) and `ZEN_BOLD`/`ZEN_DIM`/etc.
- Generic `fmt::formatter` for types with free `ToString` functions
- Compute dashboard: truncated hash display with monospace font and hover for full value
- Renamed `usonpackage_forcelink` → `cbpackage_forcelink`
- Compute enabled by default in xmake config (releases still explicitly disable)

15 files changed, 767 insertions, 205 deletions

diff --git a/src/zencompute/CLAUDE.md b/src/zencompute/CLAUDE.md
index a1a39fc3c..750879d5a 100644
--- a/src/zencompute/CLAUDE.md
+++ b/src/zencompute/CLAUDE.md
@@ -141,7 +141,7 @@ Actions that fail or are abandoned can be automatically retried or manually resc
 
 **Manual retry (API path):** `POST /compute/jobs/{lsn}` calls `RescheduleAction()`, which finds the action in `m_ResultsMap`, validates state (must be Failed or Abandoned), checks the retry limit, reverses queue counters (moving the LSN from `FinishedLsns` back to `ActiveLsns`), removes from results, and calls `ResetActionStateToPending()`. Returns 200 with `{lsn, retry_count}` on success, 409 Conflict with `{error}` on failure.
 
-**Retry limit:** Default of 3, overridable per-queue via the `max_retries` integer field in the queue's `Config` CbObject (set at `CreateQueue` time). Both automatic and manual paths respect this limit.
+**Retry limit:** Default of 3, overridable per-queue via the `max_retries` integer field in the queue's `Config` CbObject (set at `CreateQueue` time). Setting `max_retries=0` disables automatic retry entirely; omitting the field (or setting it to a negative value) uses the default of 3. Both automatic and manual paths respect this limit.
 
 **Retraction (API path):** `RetractAction(Lsn)` pulls a Pending/Submitting/Running action back for rescheduling on a different runner. The action transitions to Retracted, then `ResetActionStateToPending()` is called *without* incrementing `RetryCount`. Retraction is idempotent.
 
@@ -156,7 +156,7 @@ Queues group actions from a single client session. A `QueueEntry` (internal) tra
 - `ActiveLsns` — for cancellation lookup (under `m_Lock`)
 - `FinishedLsns` — moved here when actions complete
 - `IdleSince` — used for 15-minute automatic expiry
-- `Config` — CbObject set at creation; supports `max_retries` (int) to override the default retry limit
+- `Config` — CbObject set at creation; supports `max_retries` (int, default 3) to override the default retry limit. `0` = no retries, negative or absent = use default
 
 **Queue state machine (`QueueState` enum):**
 ```
@@ -216,11 +216,7 @@ Worker handler logic is extracted into private helpers (`HandleWorkersGet`, `Han
 
 ## Concurrency Model
 
-**Locking discipline:** When multiple locks must be held simultaneously, always acquire in this order to prevent deadlocks:
-1. `m_ResultsLock`
-2. `m_RunningLock` (comment in localrunner.h: "must be taken *after* m_ResultsLock")
-3. `m_PendingLock`
-4. `m_QueueLock`
+**Locking discipline:** The three action maps (`m_PendingActions`, `m_RunningMap`, `m_ResultsMap`) are guarded by a single `m_ActionMapLock`. This eliminates lock-ordering concerns between maps and prevents actions from being temporarily absent from all maps during state transitions. Runner-level `m_RunningLock` in `LocalProcessRunner` / `RemoteHttpRunner` is a separate lock on a different class — unrelated to the session-level action map lock.
 
 **Atomic fields** for counters and simple state: queue counts, `CpuUsagePercent`, `CpuSeconds`, `RetryCount`, `RunnerAction::m_ActionState`.
 
diff --git a/src/zencompute/computeservice.cpp b/src/zencompute/computeservice.cpp
index 92901de64..58761556a 100644
--- a/src/zencompute/computeservice.cpp
+++ b/src/zencompute/computeservice.cpp
@@ -8,6 +8,8 @@
 #	include "recording/actionrecorder.h"
 #	include "runners/localrunner.h"
 #	include "runners/remotehttprunner.h"
+#	include "runners/managedrunner.h"
+#	include "pathvalidation.h"
 #	if ZEN_PLATFORM_LINUX
 #		include "runners/linuxrunner.h"
 #	elif ZEN_PLATFORM_WINDOWS
@@ -195,13 +197,9 @@ struct ComputeServiceSession::Impl
 
 	std::atomic<IComputeCompletionObserver*> m_CompletionObserver{nullptr};
 
-	RwLock							 m_PendingLock;
-	std::map<int, Ref<RunnerAction>> m_PendingActions;
-
-	RwLock									   m_RunningLock;
+	RwLock									   m_ActionMapLock;	 // Guards m_PendingActions, m_RunningMap, m_ResultsMap
+	std::map<int, Ref<RunnerAction>>		   m_PendingActions;
 	std::unordered_map<int, Ref<RunnerAction>> m_RunningMap;
-
-	RwLock									   m_ResultsLock;
 	std::unordered_map<int, Ref<RunnerAction>> m_ResultsMap;
 	metrics::Meter							   m_ResultRate;
 	std::atomic<uint64_t>					   m_RetiredCount{0};
@@ -343,9 +341,12 @@ struct ComputeServiceSession::Impl
 	ActionCounts GetActionCounts()
 	{
 		ActionCounts Counts;
-		Counts.Pending		= (int)m_PendingLock.WithSharedLock([&] { return m_PendingActions.size(); });
-		Counts.Running		= (int)m_RunningLock.WithSharedLock([&] { return m_RunningMap.size(); });
-		Counts.Completed	= (int)m_ResultsLock.WithSharedLock([&] { return m_ResultsMap.size(); }) + (int)m_RetiredCount.load();
+		m_ActionMapLock.WithSharedLock([&] {
+			Counts.Pending	 = (int)m_PendingActions.size();
+			Counts.Running	 = (int)m_RunningMap.size();
+			Counts.Completed = (int)m_ResultsMap.size();
+		});
+		Counts.Completed += (int)m_RetiredCount.load();
 		Counts.ActiveQueues = (int)m_QueueLock.WithSharedLock([&] {
 			size_t Count = 0;
 			for (const auto& [Id, Queue] : m_Queues)
@@ -364,8 +365,10 @@ struct ComputeServiceSession::Impl
 	{
 		Cbo << "session_state"sv << ToString(m_SessionState.load(std::memory_order_relaxed));
 		m_WorkerLock.WithSharedLock([&] { Cbo << "worker_count"sv << m_WorkerMap.size(); });
-		m_ResultsLock.WithSharedLock([&] { Cbo << "actions_complete"sv << m_ResultsMap.size(); });
-		m_PendingLock.WithSharedLock([&] { Cbo << "actions_pending"sv << m_PendingActions.size(); });
+		m_ActionMapLock.WithSharedLock([&] {
+			Cbo << "actions_complete"sv << m_ResultsMap.size();
+			Cbo << "actions_pending"sv << m_PendingActions.size();
+		});
 		Cbo << "actions_submitted"sv << GetSubmittedActionCount();
 		EmitSnapshot("actions_arrival"sv, m_ArrivalRate, Cbo);
 		EmitSnapshot("actions_retired"sv, m_ResultRate, Cbo);
@@ -450,27 +453,17 @@ ComputeServiceSession::Impl::RequestStateTransition(SessionState NewState)
 void
 ComputeServiceSession::Impl::AbandonAllActions()
 {
-	// Collect all pending actions and mark them as Abandoned
+	// Collect all pending and running actions under a single lock scope
 	std::vector<Ref<RunnerAction>> PendingToAbandon;
+	std::vector<Ref<RunnerAction>> RunningToAbandon;
 
-	m_PendingLock.WithSharedLock([&] {
+	m_ActionMapLock.WithSharedLock([&] {
 		PendingToAbandon.reserve(m_PendingActions.size());
 		for (auto& [Lsn, Action] : m_PendingActions)
 		{
 			PendingToAbandon.push_back(Action);
 		}
-	});
-
-	for (auto& Action : PendingToAbandon)
-	{
-		Action->SetActionState(RunnerAction::State::Abandoned);
-	}
 
-	// Collect all running actions and mark them as Abandoned, then
-	// best-effort cancel via the local runner group
-	std::vector<Ref<RunnerAction>> RunningToAbandon;
-
-	m_RunningLock.WithSharedLock([&] {
 		RunningToAbandon.reserve(m_RunningMap.size());
 		for (auto& [Lsn, Action] : m_RunningMap)
 		{
@@ -478,6 +471,11 @@ ComputeServiceSession::Impl::AbandonAllActions()
 		}
 	});
 
+	for (auto& Action : PendingToAbandon)
+	{
+		Action->SetActionState(RunnerAction::State::Abandoned);
+	}
+
 	for (auto& Action : RunningToAbandon)
 	{
 		Action->SetActionState(RunnerAction::State::Abandoned);
@@ -742,7 +740,7 @@ std::vector<ComputeServiceSession::RunningActionInfo>
 ComputeServiceSession::Impl::GetRunningActions()
 {
 	std::vector<ComputeServiceSession::RunningActionInfo> Result;
-	m_RunningLock.WithSharedLock([&] {
+	m_ActionMapLock.WithSharedLock([&] {
 		Result.reserve(m_RunningMap.size());
 		for (const auto& [Lsn, Action] : m_RunningMap)
 		{
@@ -810,6 +808,11 @@ void
 ComputeServiceSession::Impl::RegisterWorker(CbPackage Worker)
 {
 	ZEN_TRACE_CPU("ComputeServiceSession::RegisterWorker");
+
+	// Validate all paths in the worker description upfront, before the worker is
+	// distributed to runners. This rejects malicious packages early at ingestion time.
+	ValidateWorkerDescriptionPaths(Worker.GetObject());
+
 	RwLock::ExclusiveLockScope _(m_WorkerLock);
 
 	const IoHash& WorkerId = Worker.GetObject().GetHash();
@@ -994,10 +997,15 @@ ComputeServiceSession::Impl::EnqueueResolvedAction(int QueueId, WorkerDesc Worke
 	Pending->ActionObj = ActionObj;
 	Pending->Priority  = RequestPriority;
 
-	// For now simply put action into pending state, so we can do batch scheduling
+	// Insert into the pending map immediately so the action is visible to
+	// FindActionResult/GetActionResult right away. SetActionState will call
+	// PostUpdate which adds the action to m_UpdatedActions and signals the
+	// scheduler, but the scheduler's HandleActionUpdates inserts with
+	// std::map::insert which is a no-op for existing keys.
 
 	ZEN_DEBUG("action {} ({}) PENDING", Pending->ActionId, Pending->ActionLsn);
 
+	m_ActionMapLock.WithExclusiveLock([&] { m_PendingActions.insert({ActionLsn, Pending}); });
 	Pending->SetActionState(RunnerAction::State::Pending);
 
 	if (m_Recorder)
@@ -1043,11 +1051,7 @@ ComputeServiceSession::Impl::GetSubmittedActionCount()
 HttpResponseCode
 ComputeServiceSession::Impl::GetActionResult(int ActionLsn, CbPackage& OutResultPackage)
 {
-	// This lock is held for the duration of the function since we need to
-	// be sure that the action doesn't change state while we are checking the
-	// different data structures
-
-	RwLock::ExclusiveLockScope _(m_ResultsLock);
+	RwLock::ExclusiveLockScope _(m_ActionMapLock);
 
 	if (auto It = m_ResultsMap.find(ActionLsn); It != m_ResultsMap.end())
 	{
@@ -1058,25 +1062,14 @@ ComputeServiceSession::Impl::GetActionResult(int ActionLsn, CbPackage& OutResult
 		return HttpResponseCode::OK;
 	}
 
+	if (m_PendingActions.find(ActionLsn) != m_PendingActions.end())
 	{
-		RwLock::SharedLockScope __(m_PendingLock);
-
-		if (auto FindIt = m_PendingActions.find(ActionLsn); FindIt != m_PendingActions.end())
-		{
-			return HttpResponseCode::Accepted;
-		}
+		return HttpResponseCode::Accepted;
 	}
 
-	// Lock order is important here to avoid deadlocks, RwLock m_RunningLock must
-	// always be taken after m_ResultsLock if both are needed
-
+	if (m_RunningMap.find(ActionLsn) != m_RunningMap.end())
 	{
-		RwLock::SharedLockScope __(m_RunningLock);
-
-		if (m_RunningMap.find(ActionLsn) != m_RunningMap.end())
-		{
-			return HttpResponseCode::Accepted;
-		}
+		return HttpResponseCode::Accepted;
 	}
 
 	return HttpResponseCode::NotFound;
@@ -1085,11 +1078,7 @@ ComputeServiceSession::Impl::GetActionResult(int ActionLsn, CbPackage& OutResult
 HttpResponseCode
 ComputeServiceSession::Impl::FindActionResult(const IoHash& ActionId, CbPackage& OutResultPackage)
 {
-	// This lock is held for the duration of the function since we need to
-	// be sure that the action doesn't change state while we are checking the
-	// different data structures
-
-	RwLock::ExclusiveLockScope _(m_ResultsLock);
+	RwLock::ExclusiveLockScope _(m_ActionMapLock);
 
 	for (auto It = begin(m_ResultsMap), End = end(m_ResultsMap); It != End; ++It)
 	{
@@ -1103,30 +1092,19 @@ ComputeServiceSession::Impl::FindActionResult(const IoHash& ActionId, CbPackage&
 		}
 	}
 
+	for (const auto& [K, Pending] : m_PendingActions)
 	{
-		RwLock::SharedLockScope __(m_PendingLock);
-
-		for (const auto& [K, Pending] : m_PendingActions)
+		if (Pending->ActionId == ActionId)
 		{
-			if (Pending->ActionId == ActionId)
-			{
-				return HttpResponseCode::Accepted;
-			}
+			return HttpResponseCode::Accepted;
 		}
 	}
 
-	// Lock order is important here to avoid deadlocks, RwLock m_RunningLock must
-	// always be taken after m_ResultsLock if both are needed
-
+	for (const auto& [K, v] : m_RunningMap)
 	{
-		RwLock::SharedLockScope __(m_RunningLock);
-
-		for (const auto& [K, v] : m_RunningMap)
+		if (v->ActionId == ActionId)
 		{
-			if (v->ActionId == ActionId)
-			{
-				return HttpResponseCode::Accepted;
-			}
+			return HttpResponseCode::Accepted;
 		}
 	}
 
@@ -1144,7 +1122,7 @@ ComputeServiceSession::Impl::GetCompleted(CbWriter& Cbo)
 {
 	Cbo.BeginArray("completed");
 
-	m_ResultsLock.WithSharedLock([&] {
+	m_ActionMapLock.WithSharedLock([&] {
 		for (auto& [Lsn, Action] : m_ResultsMap)
 		{
 			Cbo.BeginObject();
@@ -1275,20 +1253,14 @@ ComputeServiceSession::Impl::CancelQueue(int QueueId)
 	std::vector<Ref<RunnerAction>> PendingActionsToCancel;
 	std::vector<int>			   RunningLsnsToCancel;
 
-	m_PendingLock.WithSharedLock([&] {
+	m_ActionMapLock.WithSharedLock([&] {
 		for (int Lsn : LsnsToCancel)
 		{
 			if (auto It = m_PendingActions.find(Lsn); It != m_PendingActions.end())
 			{
 				PendingActionsToCancel.push_back(It->second);
 			}
-		}
-	});
-
-	m_RunningLock.WithSharedLock([&] {
-		for (int Lsn : LsnsToCancel)
-		{
-			if (m_RunningMap.find(Lsn) != m_RunningMap.end())
+			else if (m_RunningMap.find(Lsn) != m_RunningMap.end())
 			{
 				RunningLsnsToCancel.push_back(Lsn);
 			}
@@ -1307,7 +1279,7 @@ ComputeServiceSession::Impl::CancelQueue(int QueueId)
 	// transition from the runner is blocked (Cancelled > Failed in the enum).
 	for (int Lsn : RunningLsnsToCancel)
 	{
-		m_RunningLock.WithSharedLock([&] {
+		m_ActionMapLock.WithSharedLock([&] {
 			if (auto It = m_RunningMap.find(Lsn); It != m_RunningMap.end())
 			{
 				It->second->SetActionState(RunnerAction::State::Cancelled);
@@ -1445,7 +1417,7 @@ ComputeServiceSession::Impl::GetQueueCompleted(int QueueId, CbWriter& Cbo)
 	if (Queue)
 	{
 		Queue->m_Lock.WithSharedLock([&] {
-			m_ResultsLock.WithSharedLock([&] {
+			m_ActionMapLock.WithSharedLock([&] {
 				for (int Lsn : Queue->FinishedLsns)
 				{
 					if (m_ResultsMap.contains(Lsn))
@@ -1541,9 +1513,15 @@ ComputeServiceSession::Impl::SchedulePendingActions()
 {
 	ZEN_TRACE_CPU("ComputeServiceSession::SchedulePendingActions");
 	int	   ScheduledCount = 0;
-	size_t RunningCount	  = m_RunningLock.WithSharedLock([&] { return m_RunningMap.size(); });
-	size_t PendingCount	  = m_PendingLock.WithSharedLock([&] { return m_PendingActions.size(); });
-	size_t ResultCount	  = m_ResultsLock.WithSharedLock([&] { return m_ResultsMap.size(); });
+	size_t RunningCount	  = 0;
+	size_t PendingCount	  = 0;
+	size_t ResultCount	  = 0;
+
+	m_ActionMapLock.WithSharedLock([&] {
+		RunningCount = m_RunningMap.size();
+		PendingCount = m_PendingActions.size();
+		ResultCount	 = m_ResultsMap.size();
+	});
 
 	static Stopwatch DumpRunningTimer;
 
@@ -1560,7 +1538,7 @@ ComputeServiceSession::Impl::SchedulePendingActions()
 			DumpRunningTimer.Reset();
 
 			std::set<int> RunningList;
-			m_RunningLock.WithSharedLock([&] {
+			m_ActionMapLock.WithSharedLock([&] {
 				for (auto& [K, V] : m_RunningMap)
 				{
 					RunningList.insert(K);
@@ -1602,7 +1580,7 @@ ComputeServiceSession::Impl::SchedulePendingActions()
 	// Also note that the m_PendingActions list is not maintained
 	// here, that's done periodically in SchedulePendingActions()
 
-	m_PendingLock.WithExclusiveLock([&] {
+	m_ActionMapLock.WithExclusiveLock([&] {
 		if (m_SessionState.load(std::memory_order_relaxed) >= SessionState::Paused)
 		{
 			return;
@@ -1701,7 +1679,7 @@ ComputeServiceSession::Impl::SchedulerThreadFunction()
 	{
 		int TimeoutMs = 500;
 
-		auto PendingCount = m_PendingLock.WithSharedLock([&] { return m_PendingActions.size(); });
+		auto PendingCount = m_ActionMapLock.WithSharedLock([&] { return m_PendingActions.size(); });
 
 		if (PendingCount)
 		{
@@ -1720,22 +1698,22 @@ ComputeServiceSession::Impl::SchedulerThreadFunction()
 			m_SchedulingThreadEvent.Reset();
 		}
 
-		ZEN_DEBUG("compute scheduler TICK (Pending: {} was {}, Running: {}, Results: {}) timeout: {}",
-				  m_PendingLock.WithSharedLock([&] { return m_PendingActions.size(); }),
-				  PendingCount,
-				  m_RunningLock.WithSharedLock([&] { return m_RunningMap.size(); }),
-				  m_ResultsLock.WithSharedLock([&] { return m_ResultsMap.size(); }),
-				  TimeoutMs);
+		m_ActionMapLock.WithSharedLock([&] {
+			ZEN_DEBUG("compute scheduler TICK (Pending: {}, Running: {}, Results: {}) timeout: {}",
+					  m_PendingActions.size(),
+					  m_RunningMap.size(),
+					  m_ResultsMap.size(),
+					  TimeoutMs);
+		});
 
 		HandleActionUpdates();
 
 		// Auto-transition Draining → Paused when all work is done
 		if (m_SessionState.load(std::memory_order_relaxed) == SessionState::Draining)
 		{
-			size_t Pending = m_PendingLock.WithSharedLock([&] { return m_PendingActions.size(); });
-			size_t Running = m_RunningLock.WithSharedLock([&] { return m_RunningMap.size(); });
+			bool AllDrained = m_ActionMapLock.WithSharedLock([&] { return m_PendingActions.empty() && m_RunningMap.empty(); });
 
-			if (Pending == 0 && Running == 0)
+			if (AllDrained)
 			{
 				SessionState Expected = SessionState::Draining;
 				if (m_SessionState.compare_exchange_strong(Expected, SessionState::Paused, std::memory_order_acq_rel))
@@ -1776,9 +1754,9 @@ ComputeServiceSession::Impl::GetMaxRetriesForQueue(int QueueId)
 
 	if (Config)
 	{
-		int Value = Config["max_retries"].AsInt32(0);
+		int Value = Config["max_retries"].AsInt32(-1);
 
-		if (Value > 0)
+		if (Value >= 0)
 		{
 			return Value;
 		}
@@ -1797,7 +1775,7 @@ ComputeServiceSession::Impl::RescheduleAction(int ActionLsn)
 
 	// Find, validate, and remove atomically under a single lock scope to prevent
 	// concurrent RescheduleAction calls from double-removing the same action.
-	m_ResultsLock.WithExclusiveLock([&] {
+	m_ActionMapLock.WithExclusiveLock([&] {
 		auto It = m_ResultsMap.find(ActionLsn);
 		if (It == m_ResultsMap.end())
 		{
@@ -1871,26 +1849,20 @@ ComputeServiceSession::Impl::RetractAction(int ActionLsn)
 	bool			  WasRunning = false;
 
 	// Look for the action in pending or running maps
-	m_RunningLock.WithSharedLock([&] {
+	m_ActionMapLock.WithSharedLock([&] {
 		if (auto It = m_RunningMap.find(ActionLsn); It != m_RunningMap.end())
 		{
 			Action	   = It->second;
 			WasRunning = true;
 		}
+		else if (auto PIt = m_PendingActions.find(ActionLsn); PIt != m_PendingActions.end())
+		{
+			Action = PIt->second;
+		}
 	});
 
 	if (!Action)
 	{
-		m_PendingLock.WithSharedLock([&] {
-			if (auto It = m_PendingActions.find(ActionLsn); It != m_PendingActions.end())
-			{
-				Action = It->second;
-			}
-		});
-	}
-
-	if (!Action)
-	{
 		return {.Success = false, .Error = "Action not found in pending or running maps"};
 	}
 
@@ -1912,18 +1884,15 @@ ComputeServiceSession::Impl::RetractAction(int ActionLsn)
 void
 ComputeServiceSession::Impl::RemoveActionFromActiveMaps(int ActionLsn)
 {
-	m_RunningLock.WithExclusiveLock([&] {
-		m_PendingLock.WithExclusiveLock([&] {
-			if (auto FindIt = m_RunningMap.find(ActionLsn); FindIt == m_RunningMap.end())
-			{
-				m_PendingActions.erase(ActionLsn);
-			}
-			else
-			{
-				m_RunningMap.erase(FindIt);
-			}
-		});
-	});
+	// Caller must hold m_ActionMapLock exclusively.
+	if (auto FindIt = m_RunningMap.find(ActionLsn); FindIt == m_RunningMap.end())
+	{
+		m_PendingActions.erase(ActionLsn);
+	}
+	else
+	{
+		m_RunningMap.erase(FindIt);
+	}
 }
 
 void
@@ -1973,7 +1942,7 @@ ComputeServiceSession::Impl::HandleActionUpdates()
 					}
 					else
 					{
-						m_PendingLock.WithExclusiveLock([&] { m_PendingActions.insert({ActionLsn, Action}); });
+						m_ActionMapLock.WithExclusiveLock([&] { m_PendingActions.insert({ActionLsn, Action}); });
 					}
 					break;
 
@@ -1983,11 +1952,9 @@ ComputeServiceSession::Impl::HandleActionUpdates()
 
 				// Dispatched to a runner — move from pending to running
 				case RunnerAction::State::Running:
-					m_RunningLock.WithExclusiveLock([&] {
-						m_PendingLock.WithExclusiveLock([&] {
-							m_RunningMap.insert({ActionLsn, Action});
-							m_PendingActions.erase(ActionLsn);
-						});
+					m_ActionMapLock.WithExclusiveLock([&] {
+						m_RunningMap.insert({ActionLsn, Action});
+						m_PendingActions.erase(ActionLsn);
 					});
 					ZEN_DEBUG("action {} ({}) RUNNING", Action->ActionId, ActionLsn);
 					break;
@@ -1995,7 +1962,10 @@ ComputeServiceSession::Impl::HandleActionUpdates()
 				// Retracted — pull back for rescheduling without counting against retry limit
 				case RunnerAction::State::Retracted:
 					{
-						RemoveActionFromActiveMaps(ActionLsn);
+						m_ActionMapLock.WithExclusiveLock([&] {
+							m_RunningMap.erase(ActionLsn);
+							m_PendingActions[ActionLsn] = Action;
+						});
 						Action->ResetActionStateToPending();
 						ZEN_INFO("action {} ({}) retracted for rescheduling", Action->ActionId, ActionLsn);
 						break;
@@ -2019,7 +1989,10 @@ ComputeServiceSession::Impl::HandleActionUpdates()
 
 							if (Action->RetryCount.load(std::memory_order_relaxed) < MaxRetries)
 							{
-								RemoveActionFromActiveMaps(ActionLsn);
+								m_ActionMapLock.WithExclusiveLock([&] {
+									m_RunningMap.erase(ActionLsn);
+									m_PendingActions[ActionLsn] = Action;
+								});
 
 								// Reset triggers PostUpdate() which re-enters the action as Pending
 								Action->ResetActionStateToPending();
@@ -2034,16 +2007,16 @@ ComputeServiceSession::Impl::HandleActionUpdates()
 							}
 						}
 
-						RemoveActionFromActiveMaps(ActionLsn);
+						m_ActionMapLock.WithExclusiveLock([&] {
+							RemoveActionFromActiveMaps(ActionLsn);
 
-						// Update queue counters BEFORE publishing the result into
-						// m_ResultsMap. GetActionResult erases from m_ResultsMap
-						// under m_ResultsLock, so if we updated counters after
-						// releasing that lock, a caller could observe ActiveCount
-						// still at 1 immediately after GetActionResult returned OK.
-						NotifyQueueActionComplete(Action->QueueId, ActionLsn, TerminalState);
+							// Update queue counters BEFORE publishing the result into
+							// m_ResultsMap. GetActionResult erases from m_ResultsMap
+							// under m_ActionMapLock, so if we updated counters after
+							// releasing that lock, a caller could observe ActiveCount
+							// still at 1 immediately after GetActionResult returned OK.
+							NotifyQueueActionComplete(Action->QueueId, ActionLsn, TerminalState);
 
-						m_ResultsLock.WithExclusiveLock([&] {
 							m_ResultsMap[ActionLsn] = Action;
 
 							// Append to bounded action history ring
@@ -2282,6 +2255,18 @@ ComputeServiceSession::AddLocalRunner(ChunkResolver& InChunkResolver, std::files
 }
 
 void
+ComputeServiceSession::AddManagedLocalRunner(ChunkResolver& InChunkResolver, std::filesystem::path BasePath, int32_t MaxConcurrentActions)
+{
+	ZEN_TRACE_CPU("ComputeServiceSession::AddManagedLocalRunner");
+
+	auto* NewRunner =
+		new ManagedProcessRunner(InChunkResolver, BasePath, m_Impl->m_DeferredDeleter, m_Impl->m_LocalSubmitPool, MaxConcurrentActions);
+
+	m_Impl->SyncWorkersToRunner(*NewRunner);
+	m_Impl->m_LocalRunnerGroup.AddRunner(NewRunner);
+}
+
+void
 ComputeServiceSession::AddRemoteRunner(ChunkResolver& InChunkResolver, std::filesystem::path BasePath, std::string_view HostName)
 {
 	ZEN_TRACE_CPU("ComputeServiceSession::AddRemoteRunner");
diff --git a/src/zencompute/httpcomputeservice.cpp b/src/zencompute/httpcomputeservice.cpp
index bdfd9d197..bd3f4e70e 100644
--- a/src/zencompute/httpcomputeservice.cpp
+++ b/src/zencompute/httpcomputeservice.cpp
@@ -93,13 +93,14 @@ struct HttpComputeService::Impl
 		uint64_t NewBytes = 0;
 	};
 
-	IngestStats IngestPackageAttachments(const CbPackage& Package);
-	bool		CheckAttachments(const CbObject& ActionObj, std::vector<IoHash>& NeedList);
-	void		HandleWorkersGet(HttpServerRequest& HttpReq);
-	void		HandleWorkersAllGet(HttpServerRequest& HttpReq);
-	void		WriteQueueDescription(CbWriter& Cbo, int QueueId, const ComputeServiceSession::QueueStatus& Status);
-	void		HandleWorkerRequest(HttpServerRequest& HttpReq, const IoHash& WorkerId);
-	void		HandleSubmitAction(HttpServerRequest& HttpReq, int QueueId, int Priority, const WorkerDesc* Worker);
+	bool IngestPackageAttachments(HttpServerRequest& HttpReq, const CbPackage& Package, IngestStats& OutStats);
+	bool CheckAttachments(const CbObject& ActionObj, std::vector<IoHash>& NeedList);
+	bool ValidateAttachmentHash(HttpServerRequest& HttpReq, const CbAttachment& Attachment);
+	void HandleWorkersGet(HttpServerRequest& HttpReq);
+	void HandleWorkersAllGet(HttpServerRequest& HttpReq);
+	void WriteQueueDescription(CbWriter& Cbo, int QueueId, const ComputeServiceSession::QueueStatus& Status);
+	void HandleWorkerRequest(HttpServerRequest& HttpReq, const IoHash& WorkerId);
+	void HandleSubmitAction(HttpServerRequest& HttpReq, int QueueId, int Priority, const WorkerDesc* Worker);
 
 	// WebSocket / observer
 	void OnWebSocketOpen(Ref<WebSocketConnection> Connection);
@@ -373,7 +374,7 @@ HttpComputeService::Impl::RegisterRoutes()
 			if (HttpResponseCode ResponseCode = m_ComputeService.FindActionResult(ActionId, /* out */ Output);
 				ResponseCode != HttpResponseCode::OK)
 			{
-				ZEN_TRACE("jobs/{}/{}: {}", Req.GetCapture(1), Req.GetCapture(2), ToString(ResponseCode))
+				ZEN_DEBUG("jobs/{}/{}: {}", Req.GetCapture(1), Req.GetCapture(2), ToString(ResponseCode))
 
 				if (ResponseCode == HttpResponseCode::NotFound)
 				{
@@ -1167,35 +1168,81 @@ HttpComputeService::Impl::ResolveQueueRef(HttpServerRequest& HttpReq, std::strin
 	return ParseInt<int>(Capture).value_or(0);
 }
 
-HttpComputeService::Impl::IngestStats
-HttpComputeService::Impl::IngestPackageAttachments(const CbPackage& Package)
+bool
+HttpComputeService::Impl::ValidateAttachmentHash(HttpServerRequest& HttpReq, const CbAttachment& Attachment)
 {
-	IngestStats Stats;
+	const IoHash	 ClaimedHash = Attachment.GetHash();
+	CompressedBuffer Buffer		 = Attachment.AsCompressedBinary();
+	const IoHash	 HeaderHash	 = Buffer.DecodeRawHash();
+
+	if (HeaderHash != ClaimedHash)
+	{
+		ZEN_WARN("attachment header hash mismatch: claimed {} but header contains {}", ClaimedHash, HeaderHash);
+		HttpReq.WriteResponse(HttpResponseCode::BadRequest);
+		return false;
+	}
+
+	IoHashStream Hasher;
+
+	bool DecompressOk = Buffer.DecompressToStream(
+		0,
+		Buffer.DecodeRawSize(),
+		[&](uint64_t /*SourceOffset*/, uint64_t /*SourceSize*/, uint64_t /*Offset*/, const CompositeBuffer& Range) -> bool {
+			for (const SharedBuffer& Segment : Range.GetSegments())
+			{
+				Hasher.Append(Segment.GetView());
+			}
+			return true;
+		});
+
+	if (!DecompressOk)
+	{
+		ZEN_WARN("attachment {}: failed to decompress", ClaimedHash);
+		HttpReq.WriteResponse(HttpResponseCode::BadRequest);
+		return false;
+	}
+
+	const IoHash ActualHash = Hasher.GetHash();
+
+	if (ActualHash != ClaimedHash)
+	{
+		ZEN_WARN("attachment hash mismatch: claimed {} but decompressed data hashes to {}", ClaimedHash, ActualHash);
+		HttpReq.WriteResponse(HttpResponseCode::BadRequest);
+		return false;
+	}
+
+	return true;
+}
 
+bool
+HttpComputeService::Impl::IngestPackageAttachments(HttpServerRequest& HttpReq, const CbPackage& Package, IngestStats& OutStats)
+{
 	for (const CbAttachment& Attachment : Package.GetAttachments())
 	{
 		ZEN_ASSERT(Attachment.IsCompressedBinary());
 
-		const IoHash	 DataHash = Attachment.GetHash();
-		CompressedBuffer DataView = Attachment.AsCompressedBinary();
-
-		ZEN_UNUSED(DataHash);
+		if (!ValidateAttachmentHash(HttpReq, Attachment))
+		{
+			return false;
+		}
 
-		const uint64_t CompressedSize = DataView.GetCompressedSize();
+		const IoHash	 DataHash		= Attachment.GetHash();
+		CompressedBuffer DataView		= Attachment.AsCompressedBinary();
+		const uint64_t	 CompressedSize = DataView.GetCompressedSize();
 
-		Stats.Bytes += CompressedSize;
-		++Stats.Count;
+		OutStats.Bytes += CompressedSize;
+		++OutStats.Count;
 
 		const CidStore::InsertResult InsertResult = m_CidStore.AddChunk(DataView.GetCompressed().Flatten().AsIoBuffer(), DataHash);
 
 		if (InsertResult.New)
 		{
-			Stats.NewBytes += CompressedSize;
-			++Stats.NewCount;
+			OutStats.NewBytes += CompressedSize;
+			++OutStats.NewCount;
 		}
 	}
 
-	return Stats;
+	return true;
 }
 
 bool
@@ -1253,7 +1300,10 @@ HttpComputeService::Impl::HandleSubmitAction(HttpServerRequest& HttpReq, int Que
 			{
 				CbPackage Package = HttpReq.ReadPayloadPackage();
 				Body			  = Package.GetObject();
-				Stats			  = IngestPackageAttachments(Package);
+				if (!IngestPackageAttachments(HttpReq, Package, Stats))
+				{
+					return;	 // validation failed, response already written
+				}
 				break;
 			}
 
@@ -1268,8 +1318,7 @@ HttpComputeService::Impl::HandleSubmitAction(HttpServerRequest& HttpReq, int Que
 	{
 		// --- Batch path ---
 
-		// For CbObject payloads, check all attachments upfront before enqueuing anything
-		if (HttpReq.RequestContentType() == HttpContentType::kCbObject)
+		// Verify all action attachment references exist in the store
 		{
 			std::vector<IoHash> NeedList;
 
@@ -1345,7 +1394,6 @@ HttpComputeService::Impl::HandleSubmitAction(HttpServerRequest& HttpReq, int Que
 
 	// --- Single-action path: Body is the action itself ---
 
-	if (HttpReq.RequestContentType() == HttpContentType::kCbObject)
 	{
 		std::vector<IoHash> NeedList;
 
@@ -1491,10 +1539,14 @@ HttpComputeService::Impl::HandleWorkerRequest(HttpServerRequest& HttpReq, const
 							{
 								ZEN_ASSERT(Attachment.IsCompressedBinary());
 
+								if (!ValidateAttachmentHash(HttpReq, Attachment))
+								{
+									return;
+								}
+
 								const IoHash	 DataHash = Attachment.GetHash();
 								CompressedBuffer Buffer	  = Attachment.AsCompressedBinary();
 
-								ZEN_UNUSED(DataHash);
 								TotalAttachmentBytes += Buffer.GetCompressedSize();
 								++AttachmentCount;
 
diff --git a/src/zencompute/include/zencompute/computeservice.h b/src/zencompute/include/zencompute/computeservice.h
index 1ca78738a..ad556f546 100644
--- a/src/zencompute/include/zencompute/computeservice.h
+++ b/src/zencompute/include/zencompute/computeservice.h
@@ -167,6 +167,7 @@ public:
 	// Action runners
 
 	void AddLocalRunner(ChunkResolver& InChunkResolver, std::filesystem::path BasePath, int32_t MaxConcurrentActions = 0);
+	void AddManagedLocalRunner(ChunkResolver& InChunkResolver, std::filesystem::path BasePath, int32_t MaxConcurrentActions = 0);
 	void AddRemoteRunner(ChunkResolver& InChunkResolver, std::filesystem::path BasePath, std::string_view HostName);
 
 	// Action submission
diff --git a/src/zencompute/pathvalidation.h b/src/zencompute/pathvalidation.h
new file mode 100644
index 000000000..c2e30183a
--- /dev/null
+++ b/src/zencompute/pathvalidation.h
@@ -0,0 +1,118 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include <zencore/compactbinary.h>
+#include <zencore/except_fmt.h>
+#include <zencore/string.h>
+
+#include <filesystem>
+#include <string_view>
+
+namespace zen::compute {
+
+// Validate that a single path component contains only characters that are valid
+// file/directory names on all supported platforms. Uses Windows rules as the most
+// restrictive superset, since packages may be built on one platform and consumed
+// on another.
+inline void
+ValidatePathComponent(std::string_view Component, std::string_view FullPath)
+{
+	// Reject control characters (0x00-0x1F) and characters forbidden on Windows
+	for (char Ch : Component)
+	{
+		if (static_cast<unsigned char>(Ch) < 0x20 || Ch == '<' || Ch == '>' || Ch == ':' || Ch == '"' || Ch == '|' || Ch == '?' ||
+			Ch == '*')
+		{
+			throw zen::invalid_argument("invalid character in path component '{}' of '{}'", Component, FullPath);
+		}
+	}
+
+	// Reject empty components and trailing dots or spaces (silently stripped on Windows, leading to confusion)
+	if (Component.empty() || Component.back() == '.' || Component.back() == ' ')
+	{
+		throw zen::invalid_argument("path component '{}' of '{}' has trailing dot or space", Component, FullPath);
+	}
+
+	// Reject Windows reserved device names (CON, PRN, AUX, NUL, COM1-9, LPT1-9)
+	// These are reserved with or without an extension (e.g. "CON.txt" is still reserved).
+	std::string_view Stem = Component.substr(0, Component.find('.'));
+
+	static constexpr std::string_view ReservedNames[] = {
+		"CON",	"PRN",	"AUX",	"NUL",	"COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7",
+		"COM8", "COM9", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
+	};
+
+	for (std::string_view Reserved : ReservedNames)
+	{
+		if (zen::StrCaseCompare(Stem, Reserved) == 0)
+		{
+			throw zen::invalid_argument("path component '{}' of '{}' uses reserved device name '{}'", Component, FullPath, Reserved);
+		}
+	}
+}
+
+// Validate that a path extracted from a package is a safe relative path.
+// Rejects absolute paths, ".." components, and invalid platform filenames.
+inline void
+ValidateSandboxRelativePath(std::string_view Name)
+{
+	if (Name.empty())
+	{
+		throw zen::invalid_argument("path traversal detected: empty path name");
+	}
+
+	std::filesystem::path Parsed(Name);
+
+	if (Parsed.is_absolute())
+	{
+		throw zen::invalid_argument("path traversal detected: '{}' is an absolute path", Name);
+	}
+
+	for (const auto& Component : Parsed)
+	{
+		std::string ComponentStr = Component.string();
+
+		if (ComponentStr == "..")
+		{
+			throw zen::invalid_argument("path traversal detected: '{}' contains '..' component", Name);
+		}
+
+		// Skip "." (current directory) — harmless in relative paths
+		if (ComponentStr != ".")
+		{
+			ValidatePathComponent(ComponentStr, Name);
+		}
+	}
+}
+
+// Validate all path entries in a worker description CbObject.
+// Checks path, executables[].name, dirs[], and files[].name fields.
+// Throws an exception if any invalid paths are found.
+inline void
+ValidateWorkerDescriptionPaths(const CbObject& WorkerDescription)
+{
+	using namespace std::literals;
+
+	if (auto PathField = WorkerDescription["path"sv]; PathField.HasValue())
+	{
+		ValidateSandboxRelativePath(PathField.AsString());
+	}
+
+	for (auto& It : WorkerDescription["executables"sv])
+	{
+		ValidateSandboxRelativePath(It.AsObjectView()["name"sv].AsString());
+	}
+
+	for (auto& It : WorkerDescription["dirs"sv])
+	{
+		ValidateSandboxRelativePath(It.AsString());
+	}
+
+	for (auto& It : WorkerDescription["files"sv])
+	{
+		ValidateSandboxRelativePath(It.AsObjectView()["name"sv].AsString());
+	}
+}
+
+}  // namespace zen::compute
diff --git a/src/zencompute/runners/functionrunner.cpp b/src/zencompute/runners/functionrunner.cpp
index 4f116e7d8..67e12b84e 100644
--- a/src/zencompute/runners/functionrunner.cpp
+++ b/src/zencompute/runners/functionrunner.cpp
@@ -164,8 +164,9 @@ BaseRunnerGroup::SubmitActions(const std::vector<Ref<RunnerAction>>& Actions)
 		}
 	}
 
-	// Assign any remaining actions to runners with capacity (round-robin)
-	for (int i = 0; ActionIdx < Actions.size(); i = (i + 1) % RunnerCount)
+	// Assign any remaining actions to runners with capacity (round-robin).
+	// Cap at TotalCapacity to avoid spinning when there are more actions than runners can accept.
+	for (int i = 0; ActionIdx < Actions.size() && ActionIdx < TotalCapacity; i = (i + 1) % RunnerCount)
 	{
 		if (Capacities[i] > PerRunnerActions[i].size())
 		{
@@ -186,11 +187,12 @@ BaseRunnerGroup::SubmitActions(const std::vector<Ref<RunnerAction>>& Actions)
 		}
 	}
 
-	// Reassemble results in original action order
-	std::vector<SubmitResult> Results(Actions.size());
+	// Reassemble results in original action order.
+	// Actions beyond ActionIdx were not assigned to any runner (insufficient capacity).
+	std::vector<SubmitResult> Results(Actions.size(), SubmitResult{.IsAccepted = false, .Reason = "No capacity"});
 	std::vector<size_t>		  PerRunnerIdx(RunnerCount, 0);
 
-	for (size_t i = 0; i < Actions.size(); ++i)
+	for (size_t i = 0; i < ActionIdx; ++i)
 	{
 		size_t RunnerIdx = ActionRunnerIndex[i];
 		size_t Idx		 = PerRunnerIdx[RunnerIdx]++;
diff --git a/src/zencompute/runners/linuxrunner.cpp b/src/zencompute/runners/linuxrunner.cpp
index e79a6c90f..9055005d9 100644
--- a/src/zencompute/runners/linuxrunner.cpp
+++ b/src/zencompute/runners/linuxrunner.cpp
@@ -331,6 +331,8 @@ LinuxProcessRunner::LinuxProcessRunner(ChunkResolver&				Resolver,
 	{
 		ZEN_INFO("namespace sandboxing enabled for child processes");
 	}
+
+	StartMonitorThread();
 }
 
 SubmitResult
diff --git a/src/zencompute/runners/localrunner.cpp b/src/zencompute/runners/localrunner.cpp
index b61e0a46f..1b748c0e5 100644
--- a/src/zencompute/runners/localrunner.cpp
+++ b/src/zencompute/runners/localrunner.cpp
@@ -4,6 +4,8 @@
 
 #if ZEN_WITH_COMPUTE_SERVICES
 
+#	include "pathvalidation.h"
+
 #	include <zencore/compactbinary.h>
 #	include <zencore/compactbinarybuilder.h>
 #	include <zencore/compactbinarypackage.h>
@@ -104,8 +106,6 @@ LocalProcessRunner::LocalProcessRunner(ChunkResolver&				Resolver,
 		ZEN_INFO("Cleanup complete");
 	}
 
-	m_MonitorThread = std::thread{&LocalProcessRunner::MonitorThreadFunction, this};
-
 #	if ZEN_PLATFORM_WINDOWS
 	// Suppress any error dialogs caused by missing dependencies
 	UINT OldMode = ::SetErrorMode(0);
@@ -382,6 +382,8 @@ LocalProcessRunner::DecompressAttachmentToFile(const CbPackage&										  FromP
 	const IoHash	 ChunkHash = FileEntry["hash"sv].AsHash();
 	const uint64_t	 Size	   = FileEntry["size"sv].AsUInt64();
 
+	ValidateSandboxRelativePath(Name);
+
 	CompressedBuffer Compressed;
 
 	if (const CbAttachment* Attachment = FromPackage.FindAttachment(ChunkHash))
@@ -457,7 +459,8 @@ LocalProcessRunner::ManifestWorker(const CbPackage&										   WorkerPackage,
 
 	for (auto& It : WorkerDescription["dirs"sv])
 	{
-		std::string_view	  Name = It.AsString();
+		std::string_view Name = It.AsString();
+		ValidateSandboxRelativePath(Name);
 		std::filesystem::path DirPath{SandboxPath / std::filesystem::path(Name).make_preferred()};
 
 		// Validate dir path stays within sandbox
@@ -482,6 +485,8 @@ LocalProcessRunner::ManifestWorker(const CbPackage&										   WorkerPackage,
 	}
 
 	WriteFile(SandboxPath / "worker.zcb", WorkerDescription.GetBuffer().AsIoBuffer());
+
+	ZEN_INFO("manifested worker '{}' in '{}'", WorkerPackage.GetObjectHash(), SandboxPath);
 }
 
 CbPackage
@@ -540,6 +545,12 @@ LocalProcessRunner::GatherActionOutputs(std::filesystem::path SandboxPath)
 }
 
 void
+LocalProcessRunner::StartMonitorThread()
+{
+	m_MonitorThread = std::thread{&LocalProcessRunner::MonitorThreadFunction, this};
+}
+
+void
 LocalProcessRunner::MonitorThreadFunction()
 {
 	SetCurrentThreadName("LocalProcessRunner_Monitor");
diff --git a/src/zencompute/runners/localrunner.h b/src/zencompute/runners/localrunner.h
index b8cff6826..d6589db43 100644
--- a/src/zencompute/runners/localrunner.h
+++ b/src/zencompute/runners/localrunner.h
@@ -67,6 +67,7 @@ protected:
 	{
 		Ref<RunnerAction>	  Action;
 		void*				  ProcessHandle = nullptr;
+		int					  Pid			= 0;
 		int					  ExitCode		= 0;
 		std::filesystem::path SandboxPath;
 
@@ -83,8 +84,6 @@ protected:
 	std::filesystem::path m_SandboxPath;
 	int32_t				  m_MaxRunningActions = 64;	 // arbitrary limit for testing
 
-	// if used in conjuction with m_ResultsLock, this lock must be taken *after*
-	// m_ResultsLock to avoid deadlocks
 	RwLock										m_RunningLock;
 	std::unordered_map<int, Ref<RunningAction>> m_RunningMap;
 
@@ -95,6 +94,7 @@ protected:
 	std::thread		  m_MonitorThread;
 	std::atomic<bool> m_MonitorThreadEnabled{true};
 	Event			  m_MonitorThreadEvent;
+	void			  StartMonitorThread();
 	void			  MonitorThreadFunction();
 	virtual void	  SweepRunningActions();
 	virtual void	  CancelRunningActions();
diff --git a/src/zencompute/runners/macrunner.cpp b/src/zencompute/runners/macrunner.cpp
index 5cec90699..c2ccca9a6 100644
--- a/src/zencompute/runners/macrunner.cpp
+++ b/src/zencompute/runners/macrunner.cpp
@@ -130,6 +130,8 @@ MacProcessRunner::MacProcessRunner(ChunkResolver&				Resolver,
 	{
 		ZEN_INFO("Seatbelt sandboxing enabled for child processes");
 	}
+
+	StartMonitorThread();
 }
 
 SubmitResult
diff --git a/src/zencompute/runners/managedrunner.cpp b/src/zencompute/runners/managedrunner.cpp
new file mode 100644
index 000000000..e4a7ba388
--- /dev/null
+++ b/src/zencompute/runners/managedrunner.cpp
@@ -0,0 +1,279 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include "managedrunner.h"
+
+#if ZEN_WITH_COMPUTE_SERVICES
+
+#	include <zencore/compactbinary.h>
+#	include <zencore/compactbinarypackage.h>
+#	include <zencore/except_fmt.h>
+#	include <zencore/filesystem.h>
+#	include <zencore/fmtutils.h>
+#	include <zencore/scopeguard.h>
+#	include <zencore/timer.h>
+#	include <zencore/trace.h>
+
+ZEN_THIRD_PARTY_INCLUDES_START
+#	include <asio/io_context.hpp>
+#	include <asio/executor_work_guard.hpp>
+ZEN_THIRD_PARTY_INCLUDES_END
+
+namespace zen::compute {
+
+using namespace std::literals;
+
+ManagedProcessRunner::ManagedProcessRunner(ChunkResolver&				Resolver,
+										   const std::filesystem::path& BaseDir,
+										   DeferredDirectoryDeleter&	Deleter,
+										   WorkerThreadPool&			WorkerPool,
+										   int32_t						MaxConcurrentActions)
+: LocalProcessRunner(Resolver, BaseDir, Deleter, WorkerPool, MaxConcurrentActions)
+, m_IoContext(std::make_unique<asio::io_context>())
+, m_SubprocessManager(std::make_unique<SubprocessManager>(*m_IoContext))
+{
+	m_ProcessGroup = m_SubprocessManager->CreateGroup("compute-workers");
+
+	// Run the io_context on a small thread pool so that exit callbacks and
+	// metrics sampling are dispatched without blocking each other.
+	for (int i = 0; i < kIoThreadCount; ++i)
+	{
+		m_IoThreads.emplace_back([this, i] {
+			SetCurrentThreadName(fmt::format("mrunner_{}", i));
+
+			// work_guard keeps run() alive even when there is no pending work yet
+			auto WorkGuard = asio::make_work_guard(*m_IoContext);
+
+			m_IoContext->run();
+		});
+	}
+}
+
+ManagedProcessRunner::~ManagedProcessRunner()
+{
+	try
+	{
+		Shutdown();
+	}
+	catch (std::exception& Ex)
+	{
+		ZEN_WARN("exception during managed process runner shutdown: {}", Ex.what());
+	}
+}
+
+void
+ManagedProcessRunner::Shutdown()
+{
+	ZEN_TRACE_CPU("ManagedProcessRunner::Shutdown");
+	m_AcceptNewActions = false;
+
+	CancelRunningActions();
+
+	// Tear down the SubprocessManager before stopping the io_context so that
+	// any in-flight callbacks are drained cleanly.
+	if (m_SubprocessManager)
+	{
+		m_SubprocessManager->DestroyGroup("compute-workers");
+		m_ProcessGroup = nullptr;
+		m_SubprocessManager.reset();
+	}
+
+	if (m_IoContext)
+	{
+		m_IoContext->stop();
+	}
+
+	for (std::thread& Thread : m_IoThreads)
+	{
+		if (Thread.joinable())
+		{
+			Thread.join();
+		}
+	}
+	m_IoThreads.clear();
+}
+
+SubmitResult
+ManagedProcessRunner::SubmitAction(Ref<RunnerAction> Action)
+{
+	ZEN_TRACE_CPU("ManagedProcessRunner::SubmitAction");
+	std::optional<PreparedAction> Prepared = PrepareActionSubmission(Action);
+
+	if (!Prepared)
+	{
+		return SubmitResult{.IsAccepted = false};
+	}
+
+	CbObject WorkerDescription = Prepared->WorkerPackage.GetObject();
+
+	// Parse environment variables from worker descriptor ("KEY=VALUE" strings)
+	// into the key-value pairs expected by CreateProcOptions.
+	std::vector<std::pair<std::string, std::string>> EnvPairs;
+	for (auto& It : WorkerDescription["environment"sv])
+	{
+		std::string_view Str = It.AsString();
+		size_t			 Eq	 = Str.find('=');
+		if (Eq != std::string_view::npos)
+		{
+			EnvPairs.emplace_back(std::string(Str.substr(0, Eq)), std::string(Str.substr(Eq + 1)));
+		}
+	}
+
+	// Build command line
+	std::string_view	  ExecPath = WorkerDescription["path"sv].AsString();
+	std::filesystem::path ExePath  = Prepared->WorkerPath / std::filesystem::path(ExecPath).make_preferred();
+
+	std::string CommandLine = fmt::format("\"{}\" -Build=build.action"sv, ExePath.string());
+
+	ZEN_DEBUG("Executing (managed): '{}' (sandbox='{}')", CommandLine, Prepared->SandboxPath);
+
+	CreateProcOptions Options;
+	Options.WorkingDirectory = &Prepared->SandboxPath;
+	Options.Flags			 = CreateProcOptions::Flag_NoConsole;
+	Options.Environment		 = std::move(EnvPairs);
+
+	const int32_t ActionLsn = Prepared->ActionLsn;
+
+	ManagedProcess* Proc = nullptr;
+
+	try
+	{
+		Proc = m_ProcessGroup->Spawn(ExePath, CommandLine, Options, [this, ActionLsn](ManagedProcess& /*Process*/, int ExitCode) {
+			OnProcessExit(ActionLsn, ExitCode);
+		});
+	}
+	catch (std::exception& Ex)
+	{
+		ZEN_ERROR("Failed to spawn process for action LSN {}: {}", ActionLsn, Ex.what());
+		m_DeferredDeleter.Enqueue(ActionLsn, std::move(Prepared->SandboxPath));
+		return SubmitResult{.IsAccepted = false};
+	}
+
+	{
+		Ref<RunningAction> NewAction{new RunningAction()};
+		NewAction->Action		 = Action;
+		NewAction->ProcessHandle = static_cast<void*>(Proc);
+		NewAction->Pid			 = Proc->Pid();
+		NewAction->SandboxPath	 = std::move(Prepared->SandboxPath);
+
+		RwLock::ExclusiveLockScope _(m_RunningLock);
+		m_RunningMap[ActionLsn] = std::move(NewAction);
+	}
+
+	Action->SetActionState(RunnerAction::State::Running);
+
+	ZEN_DEBUG("Managed runner: action LSN {} -> PID {}", ActionLsn, Proc->Pid());
+
+	return SubmitResult{.IsAccepted = true};
+}
+
+void
+ManagedProcessRunner::OnProcessExit(int ActionLsn, int ExitCode)
+{
+	ZEN_TRACE_CPU("ManagedProcessRunner::OnProcessExit");
+
+	Ref<RunningAction> Running;
+
+	m_RunningLock.WithExclusiveLock([&] {
+		auto It = m_RunningMap.find(ActionLsn);
+		if (It != m_RunningMap.end())
+		{
+			Running = std::move(It->second);
+			m_RunningMap.erase(It);
+		}
+	});
+
+	if (!Running)
+	{
+		return;
+	}
+
+	ZEN_DEBUG("Managed runner: action LSN {} + PID {} exited with code " ZEN_BRIGHT_WHITE("{}"), ActionLsn, Running->Pid, ExitCode);
+
+	Running->ExitCode = ExitCode;
+
+	// Capture final CPU metrics from the managed process before it is removed.
+	auto* Proc = static_cast<ManagedProcess*>(Running->ProcessHandle);
+	if (Proc)
+	{
+		ProcessMetrics Metrics = Proc->GetLatestMetrics();
+		float		   CpuMs   = static_cast<float>(Metrics.UserTimeMs + Metrics.KernelTimeMs);
+		Running->Action->CpuSeconds.store(CpuMs / 1000.0f, std::memory_order_relaxed);
+
+		float CpuPct = Proc->GetCpuUsagePercent();
+		if (CpuPct >= 0.0f)
+		{
+			Running->Action->CpuUsagePercent.store(CpuPct, std::memory_order_relaxed);
+		}
+	}
+
+	Running->ProcessHandle = nullptr;
+
+	std::vector<Ref<RunningAction>> CompletedActions;
+	CompletedActions.push_back(std::move(Running));
+	ProcessCompletedActions(CompletedActions);
+}
+
+void
+ManagedProcessRunner::CancelRunningActions()
+{
+	ZEN_TRACE_CPU("ManagedProcessRunner::CancelRunningActions");
+
+	std::unordered_map<int, Ref<RunningAction>> RunningMap;
+	m_RunningLock.WithExclusiveLock([&] { std::swap(RunningMap, m_RunningMap); });
+
+	if (RunningMap.empty())
+	{
+		return;
+	}
+
+	ZEN_INFO("cancelling {} running actions via process group", RunningMap.size());
+
+	Stopwatch Timer;
+
+	// Kill all processes in the group atomically (TerminateJobObject on Windows,
+	// SIGTERM+SIGKILL on POSIX).
+	if (m_ProcessGroup)
+	{
+		m_ProcessGroup->KillAll();
+	}
+
+	for (auto& [Lsn, Running] : RunningMap)
+	{
+		m_DeferredDeleter.Enqueue(Running->Action->ActionLsn, std::move(Running->SandboxPath));
+		Running->Action->SetActionState(RunnerAction::State::Failed);
+	}
+
+	ZEN_INFO("DONE - cancelled {} running processes (took {})", RunningMap.size(), NiceTimeSpanMs(Timer.GetElapsedTimeMs()));
+}
+
+bool
+ManagedProcessRunner::CancelAction(int ActionLsn)
+{
+	ZEN_TRACE_CPU("ManagedProcessRunner::CancelAction");
+
+	ManagedProcess* Proc = nullptr;
+
+	m_RunningLock.WithSharedLock([&] {
+		auto It = m_RunningMap.find(ActionLsn);
+		if (It != m_RunningMap.end() && It->second->ProcessHandle != nullptr)
+		{
+			Proc = static_cast<ManagedProcess*>(It->second->ProcessHandle);
+		}
+	});
+
+	if (!Proc)
+	{
+		return false;
+	}
+
+	// Terminate the process. The exit callback will handle the rest
+	// (remove from running map, gather outputs or mark failed).
+	Proc->Terminate(222);
+
+	ZEN_DEBUG("CancelAction: initiated cancellation of LSN {}", ActionLsn);
+	return true;
+}
+
+}  // namespace zen::compute
+
+#endif
diff --git a/src/zencompute/runners/managedrunner.h b/src/zencompute/runners/managedrunner.h
new file mode 100644
index 000000000..21a44d43c
--- /dev/null
+++ b/src/zencompute/runners/managedrunner.h
@@ -0,0 +1,64 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include "localrunner.h"
+
+#if ZEN_WITH_COMPUTE_SERVICES
+
+#	include <zenutil/process/subprocessmanager.h>
+
+#	include <memory>
+
+namespace asio {
+class io_context;
+}
+
+namespace zen::compute {
+
+/** Cross-platform process runner backed by SubprocessManager.
+
+	Subclasses LocalProcessRunner, reusing sandbox management, worker manifesting,
+	input/output handling, and shared action preparation. Replaces the polling-based
+	monitor thread with async exit callbacks driven by SubprocessManager, and
+	delegates CPU/memory metrics sampling to the manager's built-in round-robin
+	sampler.
+
+	A ProcessGroup (backed by a JobObject on Windows, process group on POSIX) is
+	used for bulk cancellation on shutdown.
+
+	This runner does not perform any platform-specific sandboxing (AppContainer,
+	namespaces, Seatbelt). It is intended as a simpler, cross-platform alternative
+	to the platform-specific runners for non-sandboxed workloads.
+ */
+class ManagedProcessRunner : public LocalProcessRunner
+{
+public:
+	ManagedProcessRunner(ChunkResolver&				  Resolver,
+						 const std::filesystem::path& BaseDir,
+						 DeferredDirectoryDeleter&	  Deleter,
+						 WorkerThreadPool&			  WorkerPool,
+						 int32_t					  MaxConcurrentActions = 0);
+	~ManagedProcessRunner();
+
+	void					   Shutdown() override;
+	[[nodiscard]] SubmitResult SubmitAction(Ref<RunnerAction> Action) override;
+	void					   CancelRunningActions() override;
+	bool					   CancelAction(int ActionLsn) override;
+	[[nodiscard]] bool		   IsHealthy() override { return true; }
+
+private:
+	static constexpr int kIoThreadCount = 4;
+
+	// Exit callback posted on an io_context thread.
+	void OnProcessExit(int ActionLsn, int ExitCode);
+
+	std::unique_ptr<asio::io_context>  m_IoContext;
+	std::unique_ptr<SubprocessManager> m_SubprocessManager;
+	ProcessGroup*					   m_ProcessGroup = nullptr;
+	std::vector<std::thread>		   m_IoThreads;
+};
+
+}  // namespace zen::compute
+
+#endif
diff --git a/src/zencompute/runners/windowsrunner.cpp b/src/zencompute/runners/windowsrunner.cpp
index cd4b646e9..92ee65c2d 100644
--- a/src/zencompute/runners/windowsrunner.cpp
+++ b/src/zencompute/runners/windowsrunner.cpp
@@ -21,6 +21,12 @@ ZEN_THIRD_PARTY_INCLUDES_START
 #	include <sddl.h>
 ZEN_THIRD_PARTY_INCLUDES_END
 
+// JOB_OBJECT_UILIMIT_ERRORMODE is defined in winuser.h which may be
+// excluded by WIN32_LEAN_AND_MEAN.
+#	if !defined(JOB_OBJECT_UILIMIT_ERRORMODE)
+#		define JOB_OBJECT_UILIMIT_ERRORMODE 0x00000400
+#	endif
+
 namespace zen::compute {
 
 using namespace std::literals;
@@ -34,38 +40,65 @@ WindowsProcessRunner::WindowsProcessRunner(ChunkResolver&				Resolver,
 : LocalProcessRunner(Resolver, BaseDir, Deleter, WorkerPool, MaxConcurrentActions)
 , m_Sandboxed(Sandboxed)
 {
-	if (!m_Sandboxed)
+	// Create a job object shared by all child processes. Restricting the
+	// error-mode UI prevents crash dialogs (WER / Dr. Watson) from
+	// blocking the monitor thread when a worker process terminates
+	// abnormally.
+	m_JobObject = CreateJobObjectW(nullptr, nullptr);
+	if (m_JobObject)
 	{
-		return;
+		JOBOBJECT_EXTENDED_LIMIT_INFORMATION ExtLimits{};
+		ExtLimits.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE | JOB_OBJECT_LIMIT_DIE_ON_UNHANDLED_EXCEPTION;
+		SetInformationJobObject(m_JobObject, JobObjectExtendedLimitInformation, &ExtLimits, sizeof(ExtLimits));
+
+		JOBOBJECT_BASIC_UI_RESTRICTIONS UiRestrictions{};
+		UiRestrictions.UIRestrictionsClass = JOB_OBJECT_UILIMIT_ERRORMODE;
+		SetInformationJobObject(m_JobObject, JobObjectBasicUIRestrictions, &UiRestrictions, sizeof(UiRestrictions));
+
+		// Set error mode on this process so children inherit it. The
+		// UILIMIT_ERRORMODE restriction above prevents them from clearing
+		// SEM_NOGPFAULTERRORBOX.
+		SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX);
 	}
 
-	// Build a unique profile name per process to avoid collisions
-	m_AppContainerName = L"zenserver-sandbox-" + std::to_wstring(GetCurrentProcessId());
+	if (m_Sandboxed)
+	{
+		// Build a unique profile name per process to avoid collisions
+		m_AppContainerName = L"zenserver-sandbox-" + std::to_wstring(GetCurrentProcessId());
 
-	// Clean up any stale profile from a previous crash
-	DeleteAppContainerProfile(m_AppContainerName.c_str());
+		// Clean up any stale profile from a previous crash
+		DeleteAppContainerProfile(m_AppContainerName.c_str());
 
-	PSID Sid = nullptr;
+		PSID Sid = nullptr;
 
-	HRESULT Hr = CreateAppContainerProfile(m_AppContainerName.c_str(),
-										   m_AppContainerName.c_str(),	// display name
-										   m_AppContainerName.c_str(),	// description
-										   nullptr,						// no capabilities
-										   0,							// capability count
-										   &Sid);
+		HRESULT Hr = CreateAppContainerProfile(m_AppContainerName.c_str(),
+											   m_AppContainerName.c_str(),	// display name
+											   m_AppContainerName.c_str(),	// description
+											   nullptr,						// no capabilities
+											   0,							// capability count
+											   &Sid);
 
-	if (FAILED(Hr))
-	{
-		throw zen::runtime_error("CreateAppContainerProfile failed: HRESULT 0x{:08X}", static_cast<uint32_t>(Hr));
-	}
+		if (FAILED(Hr))
+		{
+			throw zen::runtime_error("CreateAppContainerProfile failed: HRESULT 0x{:08X}", static_cast<uint32_t>(Hr));
+		}
 
-	m_AppContainerSid = Sid;
+		m_AppContainerSid = Sid;
+
+		ZEN_INFO("AppContainer sandboxing enabled for child processes (profile={})", WideToUtf8(m_AppContainerName));
+	}
 
-	ZEN_INFO("AppContainer sandboxing enabled for child processes (profile={})", WideToUtf8(m_AppContainerName));
+	StartMonitorThread();
 }
 
 WindowsProcessRunner::~WindowsProcessRunner()
 {
+	if (m_JobObject)
+	{
+		CloseHandle(m_JobObject);
+		m_JobObject = nullptr;
+	}
+
 	if (m_AppContainerSid)
 	{
 		FreeSid(m_AppContainerSid);
@@ -172,9 +205,9 @@ WindowsProcessRunner::SubmitAction(Ref<RunnerAction> Action)
 	LPSECURITY_ATTRIBUTES lpProcessAttributes = nullptr;
 	LPSECURITY_ATTRIBUTES lpThreadAttributes  = nullptr;
 	BOOL				  bInheritHandles	  = FALSE;
-	DWORD				  dwCreationFlags	  = DETACHED_PROCESS;
+	DWORD				  dwCreationFlags	  = CREATE_SUSPENDED | DETACHED_PROCESS;
 
-	ZEN_DEBUG("Executing: {} (sandboxed={})", WideToUtf8(CommandLine.c_str()), m_Sandboxed);
+	ZEN_DEBUG("{}: '{}' (sandbox='{}')", m_Sandboxed ? "Sandboxing" : "Executing", WideToUtf8(CommandLine.c_str()), Prepared->SandboxPath);
 
 	CommandLine.EnsureNulTerminated();
 
@@ -260,14 +293,21 @@ WindowsProcessRunner::SubmitAction(Ref<RunnerAction> Action)
 		}
 	}
 
-	CloseHandle(ProcessInformation.hThread);
+	if (m_JobObject)
+	{
+		AssignProcessToJobObject(m_JobObject, ProcessInformation.hProcess);
+	}
 
-	Ref<RunningAction> NewAction{new RunningAction()};
-	NewAction->Action		 = Action;
-	NewAction->ProcessHandle = ProcessInformation.hProcess;
-	NewAction->SandboxPath	 = std::move(Prepared->SandboxPath);
+	ResumeThread(ProcessInformation.hThread);
+	CloseHandle(ProcessInformation.hThread);
 
 	{
+		Ref<RunningAction> NewAction{new RunningAction()};
+		NewAction->Action		 = Action;
+		NewAction->ProcessHandle = ProcessInformation.hProcess;
+		NewAction->Pid			 = ProcessInformation.dwProcessId;
+		NewAction->SandboxPath	 = std::move(Prepared->SandboxPath);
+
 		RwLock::ExclusiveLockScope _(m_RunningLock);
 
 		m_RunningMap[Prepared->ActionLsn] = std::move(NewAction);
@@ -275,6 +315,8 @@ WindowsProcessRunner::SubmitAction(Ref<RunnerAction> Action)
 
 	Action->SetActionState(RunnerAction::State::Running);
 
+	ZEN_DEBUG("Local runner: action LSN {} -> PID {}", Action->ActionLsn, ProcessInformation.dwProcessId);
+
 	return SubmitResult{.IsAccepted = true};
 }
 
@@ -294,6 +336,11 @@ WindowsProcessRunner::SweepRunningActions()
 
 			if (IsSuccess && ExitCode != STILL_ACTIVE)
 			{
+				ZEN_DEBUG("Local runner: action LSN {} + PID {} exited with code " ZEN_BRIGHT_WHITE("{}"),
+						  Running->Action->ActionLsn,
+						  Running->Pid,
+						  ExitCode);
+
 				CloseHandle(Running->ProcessHandle);
 				Running->ProcessHandle = INVALID_HANDLE_VALUE;
 				Running->ExitCode	   = ExitCode;
diff --git a/src/zencompute/runners/windowsrunner.h b/src/zencompute/runners/windowsrunner.h
index 9f2385cc4..adeaf02fc 100644
--- a/src/zencompute/runners/windowsrunner.h
+++ b/src/zencompute/runners/windowsrunner.h
@@ -46,6 +46,7 @@ private:
 	bool		 m_Sandboxed	   = false;
 	PSID		 m_AppContainerSid = nullptr;
 	std::wstring m_AppContainerName;
+	HANDLE		 m_JobObject = nullptr;
 };
 
 }  // namespace zen::compute
diff --git a/src/zencompute/runners/winerunner.cpp b/src/zencompute/runners/winerunner.cpp
index 506bec73b..b4fafb467 100644
--- a/src/zencompute/runners/winerunner.cpp
+++ b/src/zencompute/runners/winerunner.cpp
@@ -36,6 +36,8 @@ WineProcessRunner::WineProcessRunner(ChunkResolver&				  Resolver,
 	sigemptyset(&Action.sa_mask);
 	Action.sa_handler = SIG_DFL;
 	sigaction(SIGCHLD, &Action, nullptr);
+
+	StartMonitorThread();
 }
 
 SubmitResult