APAR status
Closed as program error.
Error description
Error Message: Crash in MM_ParallelTask::synchronizeGCThreadsAndReleaseSingleThread() or MM_ParallelTask::synchronizeGCThreadsAndReleaseMaster(). One of the following Assertion messages occurs: 04:58:41.796126707 0x1FAC200 j9mm.621 Event GC Assertion message: MM_ParallelScavengeTask::MM_ParallelScavengeTask at 0000000036E0F260 from synchronizeGCThreadsAndReleaseSingleThread: call from (ParallelScavenger.cpp:3563), expected (ParallelScavenger.cpp:4085) OR 13:35:03.922196875 *0x2B97FC00 j9mm.621 Event GC Assertion message: MM_ParallelScavengeTask::MM_ParallelScavengeTask(MM_EnvironmentB ase *, MM_Dispatcher *, MM_ParallelScavenger *, MM_CycleState *) at 00000050082FBB68 from synchronizeGCThreadsAndReleaseMaster: call with syncPointWorkUnitIndex 61, expected 99 The Snap trace file will also show the following message prior to one of the above Assertion messages: 13:35:03.922180500 0x0 j9mm.63 Event Set scavenger backout flag=true . Stack Trace: Native stack may be one of the following: MM_ParallelTask::synchronizeGCThreadsAndReleaseSingleThread+0x1b 0 () MM_ParallelScavengeTask::synchronizeGCThreadsAndReleaseSingleThr ead+0x41 () MM_ParallelScavenger::workThreadGarbageCollect+0x159 () MM_ParallelDispatcher::slaveEntryPoint+0x8a () dispatcher_thread_proc2+0x198 () j9sig_protect+0x208 () dispatcher_thread_proc+0x48 () OR MM_ParallelTask::synchronizeGCThreadsAndReleaseMaster() MM_ParallelScavengeTask::synchronizeGCThreadsAndReleaseMaster() MM_ParallelScavenger::completeBackOut() MM_ParallelScavenger::workThreadGarbageCollect() MM_ParallelScavengeTask::run() MM_ParallelDispatcher::slaveEntryPoint() .
Local fix
Problem summary
GC threads go out-of-sync during an aborted scavenge cycle.
Problem conclusion
The GC has been updated to work correctly in this scenario. . This APAR will be fixed in the following Java Releases: 8 SR5 (8.0.5.0) 7 R1 SR4 FP15 (7.1.4.15) . Contact your IBM Product's Service Team for these Service Refreshes and Fix Packs. For those running stand-alone, information about the available Service Refreshes and Fix Packs can be found at: https://www.ibm.com/developerworks/java/jdk/
Temporary fix
Comments
APAR Information
APAR number
IV99768
Reported component name
J9 COMMON CODE
Reported component ID
620700127
Reported release
270
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-09-11
Closed date
2017-09-11
Last modified date
2018-11-16
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PH05417
Fix information
Fixed component name
J9 COMMON CODE
Fixed component ID
620700127
Applicable component levels
R270 PSY
UP
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSNVBF","label":"Runtimes for Java Technology"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]
Document Information
Modified date:
22 February 2022