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8212155: Race condition when posting dynamic_code_generated event leads to JVM crash

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Reviewed-by: sspitsyn, dcubed
This commit is contained in:
Leonid Mesnik 2021-06-04 17:22:01 +00:00
parent cd0678fcf6
commit 64ec8b3e5c
3 changed files with 122 additions and 6 deletions
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14
src/hotspot/share/prims/jvmtiExport.cpp
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@ -2289,13 +2289,15 @@ void JvmtiExport::post_dynamic_code_generated_while_holding_locks(const char* na
// register the stub with the current dynamic code event collector
// Cannot take safepoint here so do not use state_for to get
// jvmti thread state.
// The collector and/or state might be NULL if JvmtiDynamicCodeEventCollector
// has been initialized while JVMTI_EVENT_DYNAMIC_CODE_GENERATED was disabled.
JvmtiThreadState* state = JavaThread::current()->jvmti_thread_state();
// state can only be NULL if the current thread is exiting which
// should not happen since we're trying to post an event
guarantee(state != NULL, "attempt to register stub via an exiting thread");
JvmtiDynamicCodeEventCollector* collector = state->get_dynamic_code_event_collector();
guarantee(collector != NULL, "attempt to register stub without event collector");
collector->register_stub(name, code_begin, code_end);
if (state != NULL) {
JvmtiDynamicCodeEventCollector *collector = state->get_dynamic_code_event_collector();
if (collector != NULL) {
collector->register_stub(name, code_begin, code_end);
}
}
}
// Collect all the vm internally allocated objects which are visible to java world