APAR status
Closed as program error.
Error description
Error Message: Under some circumstances the JIT compiler can incorrectly compile a method at high optimization level that includes profiling, resulting in the Java stack pointer being over-written with the C stack pointer. . Stack Trace: Because the problem causes corruption of the stack it is usually difficult to determine the call stack of the failing thread. . In the examples seen so far the failure occurs trying to execute non-executable code at the J9VMThread (failing rip == rbp).
Local fix
The problem can be avoided by disabling the use of JIT profiling: -Xjit:disableProfiling This option will likely result in slightly less optimal code being generated for those methods that reach the very highest optimization levels and so may reduce the maximum performance of the application. The extent of any performance impact will depend on the details of each application.
Problem summary
The problem is caused when a call to jitInstanceOf is placed within the control flow of a call to jitProfileValue, leading incorrect stack management.
Problem conclusion
This defect will be fixed in: 6.0.0 SR15 6.0.1 SR7 7.0.0 SR6 . The JIT has been modified to handle this case correctly.
Temporary fix
Comments
APAR Information
APAR number
IV48538
Reported component name
JIT
Reported component ID
620700124
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-09-12
Closed date
2013-09-12
Last modified date
2013-09-12
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
R260 PSY
UP
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Document Information
Modified date:
12 September 2013