fix Blocked state overwriting oldState in blocking enter

Signed-off-by: Jack Lu <[email protected]>

Author: fengxue-IS

runtime/vm/ObjectMonitor.cpp

@@ -164,7 +164,6 @@ objectMonitorEnterBlocking(J9VMThread *currentThread)
 		/* Table entry was created by the nonblocking case, so this peek cannot fail */
 		Assert_VM_notNull(objectMonitor);
 		object = NULL; // for safety, since object may be moved by the GC at various points after this
-		U_64 oldState = 0;
 		/* Ensure object monitor isn't deflated while we block */
 		omrthread_monitor_t monitor = objectMonitor->monitor;
 		VM_AtomicSupport::add(&monitor->pinCount, 1);
@@ -174,6 +173,8 @@ objectMonitorEnterBlocking(J9VMThread *currentThread)
 		IDATA waitTime = 1;
 		if (J9_EVENT_IS_HOOKED(vm->hookInterface, J9HOOK_VM_MONITOR_CONTENDED_ENTER)) {
 			bool frameBuilt = saveBlockingEnterObject(currentThread);
+			/* Set j.l.Thread status to BLOCKED. */
+			VM_VMHelpers::setThreadState(currentThread, J9VMTHREAD_STATE_BLOCKED);
 			VM_VMAccess::setPublicFlags(currentThread, J9_PUBLIC_FLAGS_THREAD_BLOCKED);
 			ALWAYS_TRIGGER_J9HOOK_VM_MONITOR_CONTENDED_ENTER(vm->hookInterface, currentThread, monitor);
 			restoreBlockingEnterObject(currentThread, frameBuilt);
@@ -187,7 +188,7 @@ objectMonitorEnterBlocking(J9VMThread *currentThread)
 		}
 restart:
 		/* Set j.l.Thread status to BLOCKED. */
-		oldState = VM_VMHelpers::setThreadState(currentThread, J9VMTHREAD_STATE_BLOCKED);
+		VM_VMHelpers::setThreadState(currentThread, J9VMTHREAD_STATE_BLOCKED);
 		internalReleaseVMAccessSetStatus(currentThread, J9_PUBLIC_FLAGS_THREAD_BLOCKED);
 releasedAccess:
 		omrthread_monitor_enter_using_threadId(monitor, osThread);
@@ -288,8 +289,8 @@ objectMonitorEnterBlocking(J9VMThread *currentThread)
 		}
 done:
 		clearEventFlag(currentThread, J9_PUBLIC_FLAGS_THREAD_BLOCKED);
-		/* Set j.l.Thread status to oldState. */
-		VM_VMHelpers::setThreadState(currentThread, oldState);
+		/* Set j.l.Thread status to RUNNING state. */
+		VM_VMHelpers::setThreadState(currentThread, J9VMTHREAD_STATE_RUNNING);
 
 		/* Clear the SUPPRESS_CONTENDED_EXITS bit in the monitor saying that CONTENDED EXIT can be sent again */
 		((J9ThreadMonitor*)monitor)->flags &= ~(UDATA)J9THREAD_MONITOR_SUPPRESS_CONTENDED_EXIT;