IV65392: CRASH IN GC IF -XTRACE HEAPDUMP TRIGGER SET ON TRACEPOINT J9MM.1 48

APAR status

• Closed as program error.

Error description

• Error Message: java -Xmx1m
  "-Xtrace:trigger=tpnid{j9mm.148,heapdump,,1}"
  -versionOutput:JVMDUMP034I User requested Heap dump using
  '/home/parselva/heapdump.20140523.181250.11627.0001.phd' through
  -Xtrace:triggerJVMDUMP010I Heap dump written to
  /home/parselva/heapdump.20140523.181250.11627.0001.phdUnhandled
  exceptionType=Segmentation error
  vmState=0x00020015Module=/usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x
  86_64/jre/lib/amd64/compressedrefs/libj9gc26.soModule_base_addre
  ss=00007FF4485AC000Target=2_60_20140106_181350 (Linux
  2.6.32-431.17.1.el6.x86_64)
  .
  Stack Trace: #11 signal handler called....#12 0x00007ff44862dac1
  in MM_Scavenger::reportGCCycleStart(MM_EnvironmentModron*)
  ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#13 0x00007ff44862dd09 in
  MM_Scavenger::masterThreadGarbageCollect(MM_EnvironmentModron*)
  ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#14 0x00007ff44862e837 in
  MM_Scavenger::internalGarbageCollect(MM_EnvironmentModron*,
  MM_MemorySubSpace*, MM_AllocateDescription*) ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#15 0x00007ff448613d7c in
  MM_ParallelScavenger::internalGarbageCollect(MM_EnvironmentModro
  n*, MM_MemorySubSpace*, MM_AllocateDescription*) ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#16 0x00007ff4485e5e58 in
  MM_Collector::garbageCollect(MM_EnvironmentModron*,
  MM_MemorySubSpace*, MM_AllocateDescription*, unsigned int,
  MM_ObjectAllocationInterface*, MM_MemorySubSpace*,
  MM_AllocationContext*) () from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#17 0x00007ff44872bd92 in
  MM_MemorySubSpaceSemiSpace::allocationRequestFailed(MM_Environme
  ntModron*, MM_AllocateDescription*,
  MM_MemorySubSpace::AllocationType,
  MM_ObjectAllocationInterface*, MM_MemorySubSpace*,
  MM_MemorySubSpace*) ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#18 0x00007ff4487332cb in
  MM_TLHAllocationInterface::refresh(MM_EnvironmentModron*,
  MM_AllocateDescription*, bool) ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#19 0x00007ff448733486 in
  MM_TLHAllocationInterface::allocateFromTLH(MM_EnvironmentModron*
  , MM_AllocateDescription*, bool) ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#20 0x00007ff448733839 in
  MM_TLHAllocationInterface::allocateObject(MM_EnvironmentModron*,
  MM_AllocateDescription*, MM_MemorySpace*, bool) ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#21 0x00007ff448736937 in
  MM_ArrayletAllocationModel::allocateAndInitializeLayout(MM_Memor
  ySpace*, MM_EnvironmentModron*, MM_AllocateDescription*,
  unsigned int, bool) () from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#22 0x00007ff448736c10 in
  MM_ArrayletAllocationModel::allocateIndexableObject(MM_Environme
  ntModron*, MM_AllocateDescription*, unsigned int, bool) ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#23 0x00007ff4485f1519 in
  J9AllocateIndexableObject () from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9gc26.so#24 0x00007ff447ef9d0c in
  Java_java_security_AccessController_getProtectionDomains ()from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libjclse7b_26.so#25 0x00007ff44fd970da in
  VMprJavaSendNative () from
  /usr/lib/jvm/java-1.7.0-ibm-1.7.0.6.1.x86_64/jre/lib/amd64/compr
  essedrefs/libj9vm26.so
  .
  

Local fix

• Disable the GC compaction that is performed in preparation for
  the heapdump by specifying the following
  option:-Xdump:heap:defaults:request=exclusive+prepwalk
  

Problem summary

• The problem is caused when triggering a heapdump from a GC
  tracepoint while GC is running.
  

Problem conclusion

• The heapdump preparation code in the JVM has been updated to
  avoid making the GC compaction request while a GC is in
  progress.
  .
  This APAR will be fixed in the following Java Releases:
     7    SR8       (7.0.8.0)
     7 R1 SR2       (7.1.2.0)
     6 R1 SR8 FP2   (6.1.8.2)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, Java maintenance is available
  from:
             https://www.ibm.com/developerworks/java/jdk/
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R260 PSY

     UP

• R270 PSY

     UP