APAR status
Closed as program error.
Error description
Error Message: N/A . Stack Trace: N/A . A loop copying from a byte array into a character array updates only one of the two integer variables that it is meant to update. Generally the result of this is inconsistent state after execution of the loop. One potential symptom is that the loop appears to exit prematurely. This only occurs on z Systems.
Local fix
The issue can be worked around using -Xjit:disableIdiomRecognition, which may be restricted to a particular method. Note that this may impact performance.
Problem summary
An optimization in the JIT compiler recognized the loop and transformed it into a specialized hardware instruction sequence, but omitted to update one of the variables modified by the original loop.
Problem conclusion
The compiler has been modified so that it will no longer transform this particular form of recognized loop, which is rare. . This APAR will be fixed in the following Java Releases: 7 SR9 FP40 (7.0.9.40) 8 SR3 (8.0.3.0) 6 SR16 FP25 (6.0.16.25) 7 R1 SR3 FP40 (7.1.3.40) 6 R1 SR8 FP25 (6.1.8.25) . 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
IV81083
Reported component name
JIT
Reported component ID
620700124
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-02-02
Closed date
2016-02-02
Last modified date
2017-04-26
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PI79842
Fix information
Fixed component name
JIT
Fixed component ID
620700124
Applicable component levels
R260 PSY
UP
R130 PSY
UP
R600 PSY
UP
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"260","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
26 April 2017