APAR status
Closed as program error.
Error description
Error Message: When using a JVMTI or Java agent to redefine Java method bytecode during execution, the user may be able to observe that a previous version of a method is executed under rare circumstances. These circumstances will involve methods compiled after JITSTARTUP using nextGenHCR. The JIT may fail to place an OSR guard after some loop asyncchecks. . Stack Trace: N/A . The problem is limited to Java 8sr5 up to and including fp26 (8.0.5.0 through 8.0.5.26)
Local fix
The problem can be circumvented with -Xjit:disableNextGenHCR.
Problem summary
The JIT dataflow analysis used to implement method redefinition support for nextGenHCR may fail to place transitions at all points required to prevent execution continuing in JITed code after a method redefinition.
Problem conclusion
The dataflow analysis has been enhanced to ensure appropriate transitions are placed at all required points to prevent entering the wrong version of a method after redefinition. . This APAR will be fixed in the following Java Releases: 8 SR5 FP27 (8.0.5.27) . 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
IJ12158
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-12-13
Closed date
2018-12-13
Last modified date
2018-12-13
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
[{"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":"130","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
13 December 2018