APAR status
Closed as program error.
Error description
Error Message: This can result in a segmentation error raised by the Garbage Collector with vmstate=0x0002000f, or various other error messages are possible. . Stack Trace: If the segmentation error is raised by the Garbage Collector, the stack trace will look approximately like this: MM_ParallelScavenger::copy MM_ParallelScavenger::incrementalScanCacheBySlot MM_ParallelScavenger::completeScan MM_ParallelScavengerRootClearer::scanUnfinalizedObjectsComplete MM_RootScanner::scanClearable MM_ParallelScavenger::workThreadGarbageCollect MM_ParallelDispatcher::slaveEntryPoint .
Local fix
This problem can be avoided by using the following Java option: -Xjit:disableExplicitNewInitialization
Problem summary
The JIT compiler may generate an optimized sequence of code used to zero initialize new objects. Doing this has exposed a problem where the code that is generated for zero initialization can continue past the last field of an object and writes zeros in whatever proceeds it in memory, which is likely a header of another object.
Problem conclusion
This problem is related to the ExplicitNewInitialization optimization. The JIT compiler has been updated to remove the problematic parts of this optimization. . This APAR will be fixed in the following Java Releases: 8 SR2 (8.0.2.0) . 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
IV78387
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2015-10-26
Closed date
2015-10-26
Last modified date
2015-10-26
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
R130 PSY
UP
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Document Information
Modified date:
26 October 2015