Merge #18458: net: Add missing cs_vNodes lock

fa369651c5523f393e0bfcfa328b8e27006711aa net: Add missing cs_vNodes lock (MarcoFalke)

Pull request description:

  Fixes #18457

ACKs for top commit:
  promag:
    Code review ACK fa369651c5523f393e0bfcfa328b8e27006711aa.
  laanwj:
    ACK fa369651c5523f393e0bfcfa328b8e27006711aa

Tree-SHA512: 60d7000f2f3d480bb0953ce27a0020763e7102da16a0006b619e0a236cfc33cbd4f83d870e9f0546639711cd877c1f9808d419184bbc153bb328885417e0066c

1 files changed, 14 insertions, 1 deletions

diff --git a/src/init.cpp b/src/init.cpp
index 88caed9de..437e93409 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -197,7 +197,20 @@ void Shutdown(NodeContext& node)
     // Because these depend on each-other, we make sure that neither can be
     // using the other before destroying them.
     if (node.peer_logic) UnregisterValidationInterface(node.peer_logic.get());
-    if (node.connman) node.connman->Stop();
+    // Follow the lock order requirements:
+    // * CheckForStaleTipAndEvictPeers locks cs_main before indirectly calling GetExtraOutboundCount
+    //   which locks cs_vNodes.
+    // * ProcessMessage locks cs_main and g_cs_orphans before indirectly calling ForEachNode which
+    //   locks cs_vNodes.
+    // * CConnman::Stop calls DeleteNode, which calls FinalizeNode, which locks cs_main and calls
+    //   EraseOrphansFor, which locks g_cs_orphans.
+    //
+    // Thus the implicit locking order requirement is: (1) cs_main, (2) g_cs_orphans, (3) cs_vNodes.
+    if (node.connman) {
+        node.connman->StopThreads();
+        LOCK2(::cs_main, ::g_cs_orphans);
+        node.connman->StopNodes();
+    }
 
     StopTorControl();