# HG changeset patch
# User shade
# Date 1571338564 -7200
# Node ID 0cc52a55fce4ff0fd5a37a958b63b1714f2f64f4
# Parent  42a3a8941418821813e75f704645bcc0c92b2a6c
8232534: Shenandoah: guard against reentrant ShenandoahHeapLock locking
Reviewed-by: rkennke

diff -r 42a3a8941418 -r 0cc52a55fce4 src/hotspot/share/gc/shenandoah/shenandoahLock.hpp
--- a/src/hotspot/share/gc/shenandoah/shenandoahLock.hpp	Thu Oct 17 13:14:48 2019 -0400
+++ b/src/hotspot/share/gc/shenandoah/shenandoahLock.hpp	Thu Oct 17 20:56:04 2019 +0200
@@ -41,6 +41,9 @@
   ShenandoahLock() : _state(unlocked), _owner(NULL) {};
 
   void lock() {
+#ifdef ASSERT
+    assert(_owner != Thread::current(), "reentrant locking attempt, would deadlock");
+#endif
     Thread::SpinAcquire(&_state, "Shenandoah Heap Lock");
 #ifdef ASSERT
     assert(_state == locked, "must be locked");