JDK-8209889 : RedefineStress tests crash
  • Type: Bug
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 12
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2018-08-23
  • Updated: 2019-05-28
  • Resolved: 2018-10-05
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Description
vmTestbase/nsk/jvmti/RedefineClasses/StressRedefine/TestDescription.java

#  Internal Error (/scratch/opt/mach5/mesos/work_dir/slaves/c4ee7e63-1ded-4e8c-9581-ce26f27e3af4-S150176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/1a72085d-2fb3-4c17-95fb-f55cfe80d904/runs/d0af250e-7cd1-4b65-81d4-a5fc073dbfa1/workspace/open/src/hotspot/share/runtime/handles.inline.hpp:73), pid=20865, tid=20923
#  assert(((Metadata*)obj)->is_valid()) failed: obj is valid
#

And

vmTestbase/nsk/jvmti/RedefineClasses/StressRedefineWithoutBytecodeCorruption/TestDescription.java	

#
#  Internal Error (/scratch/opt/mach5/mesos/work_dir/slaves/c4ee7e63-1ded-4e8c-9581-ce26f27e3af4-S150176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/1a72085d-2fb3-4c17-95fb-f55cfe80d904/runs/d0af250e-7cd1-4b65-81d4-a5fc073dbfa1/workspace/open/src/hotspot/share/oops/instanceKlass.cpp:3791), pid=3887, tid=3908
#  assert(method->is_obsolete() || method->is_running_emcp()) failed: emcp method cannot run after emcp bit is cleared
#

Moving purging these out of do_unloading might not be working.
Comments
Fix Request This intermittent crash can cause memory to be reclaimed while the memory is in the queue of methods to be compiled. This crash only happens when the method is redefined, which is a small window. The fix is simple; to move the code that the safepoints that leaks the compile task. This code causing the breakage was added in jdk11. The JDK 12 patch does not apply cleanly. There was dead code removed in 12 in the area. Code was tested with mach5 hs-tier1 and 2. Review thread. Last two entries are the jdk11 review. http://mail.openjdk.java.net/pipermail/hotspot-dev/2018-October/034509.html
05-10-2018