APAR status
Closed as program error.
Error description
Error Message: This problem can manifest itself in various forms as a value in a register may be unexpectedly changed. . Stack Trace: N/A . This problem can only happen on z Systems.
Local fix
Problem summary
When generating instructions for integer shift bytecodes (ishr or ishl), the JIT compiler will use an NILL instruction with an immediate of 0x1F as part of the sequence. This instruction changes the value of the destination register. The JIT compiler can potentially make the mistake of not realizing that the original value of the destination register is still needed. If this is the case, then unexpected results will probably occur when the modified destination register is used as if it were the original value.
Problem conclusion
The JIT compiler has been updated to ensure that the generated code for integer shift bytecodes does not clobber values in registers which later need to be used. . This APAR will be fixed in the following Java Releases: 7 SR9 FP50 (7.0.9.50) 7 R1 SR3 FP50 (7.1.3.50) 6 SR16 FP30 (6.0.16.30) 6 R1 SR8 FP30 (6.1.8.30) 8 SR3 FP10 (8.0.3.10) . 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
IV86387
Reported component name
JIT
Reported component ID
620700124
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-06-29
Closed date
2016-06-29
Last modified date
2016-06-29
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
R260 PSY
UP
R130 PSY
UP
R600 PSY
UP
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Document Information
Modified date:
29 June 2016