APAR status
Closed as program error.
Error description
Error Message: A SIGSEGV/GPF is received. . Stack Trace: Relevant stack trace: #12 in TR_CHTable::cleanupNewlyExtendedInfo(TR_Compilation*) () #13 in TR_CompilationInfoPerThreadBase::compile(J9VMThread*, TR_MethodToBeCompiled*, bool) () #14 in protectedCompilationThreadProc(J9PortLibrary*, TR_CompilationInfoPerThread*) () .
Local fix
The problem does not show if the user disables optimizations based on class hierarchy table -Xjit:disableCHOpts This solution is expected to slightly degrade throughput of applications Another workaround is to disable dynamic class unloading with -Xnoclassgc This solution may increase the memory footprint (possibly leading to OutOfMemory errors) if the application is relying heavily on dynamically generated classes that are subsequently unloaded.
Problem summary
The problem may appear when the JIT is doing some cleanup over the class hierarchy table (at the end of a compilation) and one of the classes from the class hierarchy table has been unloaded during the compilation.
Problem conclusion
This defect will be fixed in: 6.0.0 SR10 . The JIT has been modified to avoid accessing classes that have been unloaded (during the JIT compilation) . To obtain the fix: Install build 20110531 or later
Temporary fix
Comments
APAR Information
APAR number
IV02326
Reported component name
JIT
Reported component ID
620700124
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-06-23
Closed date
2011-06-23
Last modified date
2011-06-23
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
R600 PSY
UP
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Document Information
Modified date:
23 June 2011