[HARMONY-5103] [drlvm] Crash in DeleteGlobalRef

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Component/s: DRLVM
• Environment: x86-64
• Assignee: Gregory Shimansky
• Reporter: Pavel Afremov
• Created: 09/Nov/07 19:02
• Updated: 28/Dec/07 13:27
• Resolved: 12/Nov/07 15:20

Description

During evaluating HARMONY-2772 crash on following stack was reproduced:

SIGSEGV in VM code.
Stack trace:
0: JNIEnv_External::DeleteGlobalRef(_jobject*) (/nfs/ims/proj/drl/mrt2/users/pnafremo/work/H64/drlvm/vm/include/jni.h:678)
1: jthread_vm_detach (/nfs/ims/proj/drl/mrt2/users/pnafremo/work/H64/drlvm/vm/vmcore/src/thread/thread_java_basic.cpp:419)
2: jthread_wrapper_start_proc(void*) (/nfs/ims/proj/drl/mrt2/users/pnafremo/work/H64/drlvm/vm/vmcore/src/thread/thread_java_basic.cpp:172)
3: start_thread (??:-1)
<end of stack trace>
Segmentation fault

As evaluation shows the source of the crash is in jni_env usage after deallocation in vm_detach.
If jni_env, after deallocation but before usage, is nullified in other thread, sigsegv happen.

Issue Links

• is duplicated by: HARMONY-4955 [drlvm] classloader.StressLoader crashes intermittently
• relates to: HARMONY-2772 [drlvm][gc] test stress.Mix intermittently failed on the em64t platform