APAR status
Closed as program error.
Error description
Error Message: A GPF/SIGSEGV is received when a compiled Java method is executed that contains loops (or calls to methods containing loops). The method is likely to be hot (frequently executed) and heavily optimized. The direct cause of the crash is an attempt to dereference a pointer that has been loaded from a stack slot that was not initialized. . Stack Trace: N/A .
Local fix
The issue can be avoided with the -Xjit:disableLoopVersioner option. However, this can cause significant (2% to 10%) impact on performance.
Problem summary
The JIT compiler contained a loop optimization bug which could lose variable updates in a loop in the generated code.
Problem conclusion
This defect will be fixed in: 5.0.0 SR11 . The JIT compiler has been modified to correct the problem. . To obtain the fix: Install build 20090928 or later
Temporary fix
Comments
APAR Information
APAR number
IZ61357
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
2009-09-24
Closed date
2009-12-16
Last modified date
2009-12-16
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
IZ61639
Fix information
Fixed component name
JAVA 5 JIT
Fixed component ID
620500124
Applicable component levels
R500 PSN
UP
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