APAR status
Closed as program error.
Error description
Error Message: The application hangs when running with -Xgc:concurrentScavenge on a z14 machine typically with smaller heaps. . Stack Trace: N/A . Collecting multiple core dumps will show we are stuck in a look executing J9ReadBarrier in an attempt to evacuate an object when the heap is entirely full.
Local fix
Increasing the heap size may make the problem much less likely to happen, however the only workaround for this issue is to disable concurrent scavenge by removing the -Xgc:concurrentScavenge option from the command line arguments.
Problem summary
The JIT compiler was not aware of the situation in which J9ReadBarrier was unable to evacuate an object and would return back to the JIT mainline to re-execute a guarded load.
Problem conclusion
This problem has been addressed by https://github.com/eclipse/openj9/pull/3763 . This APAR will be fixed in the following Java Releases: 8 SR5 FP27 (8.0.5.27) . 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
IJ11619
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-11-28
Closed date
2018-11-28
Last modified date
2018-11-28
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
JIT
Fixed component ID
620700124
Applicable component levels
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"130","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
28 November 2018