APAR status
Closed as program error.
Error description
Error Message: Version 8.0.5.0 (Java 8 SR5) crashes during GC when running with -XX:-EnableHCR (i.e. with HCR disabled). This is a non-default setting and is unlikely to be encountered in normal use. . Stack Trace: While the exact location of the crash will vary, the stack will include stackAllocatedObjectSlotWalkFunction, e.g. 0x00007fdc311e85c8 {libj9gc29.so}{_ZN12MM_Scavenger14rememberObjectEP22MM_Environme ntStandardP8J9Object} <OSB>0x7fdbdfddc3f8<CSB> 0x00007fdc311e8752 {libj9gc29.so}{_ZN12MM_Scavenger16rescanThreadSlotEP22MM_Environ mentStandardPP8J9Object} <OSB>0x7fdbdfddc400<CSB> 0x00007fdc31c818ff {libj9jit29.so}{stackAllocatedObjectSlotWalkFunction} <OSB>0x7fdbdfddc460<CSB> 0x00007fdc31080bdb {libj9gc29.so}{j9mm_iterate_object_slots} <OSB>0x7fdbdfddc470<CSB> 0x00007fdc31c81b71 {libj9jit29.so}{walkJITFrameSlots} <OSB>0x7fdbdfddc5b0<CSB> 0x00007fdc31c8212a {libj9jit29.so}{jitWalkFrame} <OSB>0x7fdbdfddc630<CSB> .
Local fix
HCR is enabled by default, so the crash can only happen if the the -XX:-EnableHCR and the related -Xjit:disableNextGenHCR are used. Removing these options and restarting the JVM will avoid the problem. If running with HCR is not possible for some reason, the use of -Xjit:disableEscapeAnalysis should also prevent the crash, however this will likely impose some degree of performance overhead. The extent of any such overhead will vary from application to application.
Problem summary
Under rare circumstances the JIT failed to correctly initialise an object reference before the GC accessed it. Stale data in the object reference could then cause the GC to crash.
Problem conclusion
The JIT has been modified to ensure that object references in stack allocated objects are correctly initialized before they can be inspected by the GC. . This APAR will be fixed in the following Java Releases: 8 SR5 FP5 (8.0.5.5) . 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
IJ01916
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-11-15
Closed date
2017-11-15
Last modified date
2017-11-15
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:
15 November 2017