Got the following assertion failure while running: vmTestbase/nsk/jvmti/GetObjectMonitorUsage/objmonusage005/TestDescription.java

#  Internal Error (t:/workspace/open/src/hotspot/share/runtime/mutexLocker.cpp:171), pid=8976, tid=19504
#  fatal error: must own lock Threads_lock

JDK-8241043 introduced an assertion in Thread::stack_base() that calls Thread::name().  Thread::name() for a JavaThread calls JavaThread::get_thread_name, which requires safepoint or Threads_lock or handshake if called from other than the current JavaThread.

(This seems related to (or perhaps an actual occurrence of) the problem described in JDK-8241403.)

jvmti_GetObjectMonitorUsage reaches that point without that state, leading to the assertion failure.

Here's the stack trace from the hs_err file:

stack: [0x000000f524f10000,0x000000f525010000]
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [jvm.dll+0x9d7881]  os::platform_print_native_stack+0xf1  (os_windows_x86.cpp:369)
V  [jvm.dll+0xbda9ab]  VMError::report+0xf0b  (vmerror.cpp:725)
V  [jvm.dll+0xbdc25e]  VMError::report_and_die+0x8ae  (vmerror.cpp:1533)
V  [jvm.dll+0xbdc954]  VMError::report_and_die+0x64  (vmerror.cpp:1317)
V  [jvm.dll+0x410210]  report_fatal+0x80  (debug.cpp:286)
V  [jvm.dll+0x98bdf6]  assert_locked_or_safepoint_or_handshake+0xf6  (mutexlocker.cpp:193)
V  [jvm.dll+0xb78ca5]  JavaThread::get_thread_name+0x85  (thread.cpp:3155)
V  [jvm.dll+0x17c37]  Thread::stack_end+0x27  (thread.hpp:755)
V  [jvm.dll+0xb79edb]  JavaThread::is_lock_owned+0x2b  (thread.cpp:2246)
V  [jvm.dll+0xb7bd24]  Threads::owning_thread_from_monitor_owner+0x74  (thread.cpp:4713)
V  [jvm.dll+0x7e0fb3]  JvmtiEnvBase::get_object_monitor_usage+0x1e3  (jvmtienvbase.cpp:996)
V  [jvm.dll+0x7d81dc]  JvmtiEnv::GetObjectMonitorUsage+0x4c  (jvmtienv.cpp:2847)
V  [jvm.dll+0x798440]  jvmti_GetObjectMonitorUsage+0x130  (jvmtienter.cpp:4105)
C  [objmonusage005.dll+0x1136]

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j  nsk.jvmti.GetObjectMonitorUsage.objmonusage005.check(Ljava/lang/Object;)V+0
j  nsk.jvmti.GetObjectMonitorUsage.objmonusage005.run([Ljava/lang/String;Ljava/io/PrintStream;)I+31
j  nsk.jvmti.GetObjectMonitorUsage.objmonusage005.main([Ljava/lang/String;)V+9
v  ~StubRoutines::call_stub
j  jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Ljava/lang/reflect/Method;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+0 java.base@15-ea
j  jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+100 java.base@15-ea
j  jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+6 java.base@15-ea
j  java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+59 java.base@15-ea
j  com.sun.javatest.regtest.agent.MainWrapper$MainThread.run()V+172
j  java.lang.Thread.run()V+11 java.base@15-ea
v  ~StubRoutines::call_stub