APAR status
Closed as program error.
Error description
Error Message: A SIGSEGV or ABEND occurs in a JIT-compiled method after an inlined method throws an exception which is caught by a handler in the JIT-compiled method. The catch is often implicit, caused by the exception being thrown out of a synchronize block, which requires the JVM to unlock an object before continuing to look for a suitable catch block down the call stack. Hence, in some cases, the crash point can be in the native function jitMonitorExit. . Stack Trace: . This failure only occurs on a z196 system running z/OS or z/Linux.
Local fix
This issue can be avoided by using the -Xjit:disableZGryphon option.
Problem summary
The crash or ABEND occurs when program execution jumps to a wrong exception handler, due to an incorrectly specified exception range in the exception table of the JIT-compiled method. This problem is caused by a z196-specific optimization that exploits conditional move instructions to eliminate unnecessary branches. When the branch being eliminated comes from a basic block that can throw exceptions, the JIT compiler fails to mark the end of the exception range properly, and eventually generates a corrupt exception table.
Problem conclusion
This defect will be fixed in: 6.0.1 SR2 FP1 7.0.0 SR2 . The JIT compiler has been updated to generate correct exception ranges in this scenario.
Temporary fix
Comments
APAR Information
APAR number
IV20339
Reported component name
JIT
Reported component ID
620700124
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-04-29
Closed date
2012-05-18
Last modified date
2012-10-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PM74205
Fix information
Fixed component name
JIT
Fixed component ID
620700124
Applicable component levels
R260 PSY
UP
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Document Information
Modified date:
02 October 2012