--- a/hotspot/src/share/vm/runtime/thread.cpp Thu May 29 14:31:28 2014 +0200
+++ b/hotspot/src/share/vm/runtime/thread.cpp Wed Jun 04 14:16:20 2014 +0200
@@ -3968,8 +3968,14 @@
// GC vm_operations can get caught at the safepoint, and the
// heap is unparseable if they are caught. Grab the Heap_lock
// to prevent this. The GC vm_operations will not be able to
- // queue until after the vm thread is dead. After this point,
- // we'll never emerge out of the safepoint before the VM exits.
+ // queue until after the vm thread is dead.
+ // After this point, we'll never emerge out of the safepoint before
+ // the VM exits, so concurrent GC threads do not need to be explicitly
+ // stopped; they remain inactive until the process exits.
+ // Note: some concurrent G1 threads may be running during a safepoint,
+ // but these will not be accessing the heap, just some G1-specific side
+ // data structures that are not accessed by any other threads but them
+ // after this point in a terminal safepoint.
MutexLocker ml(Heap_lock);