APAR status
Closed as program error.
Error description
Error Message: This problem is only possible on POWER platforms running Java 7.1 builds that include IV76415. Under certain conditions in JIT compiled code a load instruction will be incorrectly removed during the optimization process and lead to crashes or incorrect behavior. . Stack Trace: N/A .
Local fix
This problem can be worked around by defining the following environment variable: TR_DisableLHSPeephole=<any value>. This workaround may incur a small performance penalty.
Problem summary
Under certain conditions in JIT compiled code a load instruction immediately following a store instruction will be incorrectly removed during the optimization process and lead to crashes or incorrect behavior. The store instruction must be a D-form instruction in order for this problem to manifest. In certain cases the load instruction will be replaced by an mr instruction, in others it will simply be deleted.
Problem conclusion
This problem is only possible on POWER platforms running Java 7.1 builds that include IV76415. The JIT compiler has been fixed to avoid this problem. . This APAR will be fixed in the following Java Releases: 8 SR2 (8.0.2.0) 7 R1 SR3 FP20 (7.1.3.20) . Contact your IBM Product's Service Team for these Service Refreshes and Fix Packs. For those running stand-alone, information about the available Service Refreshes and Fix Packs can be found at: https://www.ibm.com/developerworks/java/jdk/
Temporary fix
Comments
APAR Information
APAR number
IV77449
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-09-24
Closed date
2015-09-24
Last modified date
2015-09-24
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
R130 PSY
UP
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Document Information
Modified date:
24 September 2015