APAR status
Closed as program error.
Error description
Error Message: SIGSEGV in JIT library running jitWalkFrame() . Stack Trace: {libj9jit24.so}{jitWalkFrame} {libj9jit24.so}{jitWalkStackFrames} {libj9vm24.so}{walkStackFrames} {libj9gc24.so}{scanSlots__28GC_VMThreadStackSlotIterator...} {libj9gc24.so}{scanOneThread__14MM_RootScanner...} {libj9gc24.so}{scanThreads__14MM_RootScanner...} {libj9gc24.so}{scanRoots__14MM_RootScanner...} {libj9gc24.so}{markRoots__16MM_MarkingScheme...} {libj9gc24.so}{markLiveObjects__16MM_MarkingScheme...} {libj9gc24.so}{run__19MM_ParallelMarkTask...} .
Local fix
You can avoid the problem by using the following java command line parameter: -Xjit:disableNewInstanceImplOpt Note: Using this option will have a small effect on performance. The degree of the effect is based on how frequently the Class.newInstance() API is used by the java application.
Problem summary
The JIT can compile helper routines to optimize calls to the Class.newInstance() API. If the JIT compiles a helper to optimize the case where Class.newInstance() is called against an array class and a GC is triggered when that helper is executing, the stack walker will crash with a SIGSEGV.
Problem conclusion
This defect will be fixed in: 5.0.0 SR13 6.0.0 SR10 6.0.1 SR1 . The JIT was modified so that it will refuse to compile Class.newInstance() helpers against array classes . To obtain the fix: Install build 20110909 or later
Temporary fix
Comments
APAR Information
APAR number
IV07652
Reported component name
JAVA 5 JIT
Reported component ID
620500124
Reported release
500
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-09-15
Closed date
2011-09-20
Last modified date
2011-09-25
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
JAVA 5 JIT
Fixed component ID
620500124
Applicable component levels
R500 PSY
UP
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Document Information
Modified date:
25 September 2011