APAR status
Closed as program error.
Error description
Error Message: The error will be a segmentation error and can happen while the JIT Compiler is trying to compile a method. It can crash while trying to compile various types of methods. It will look as follows: Type=Segmentation error vmState=0x0005ff06 ... Method_being_compiled=<OSB>NameOfMethodBeingCompiled<CSB> . Stack Trace: OMR::Z::Machine::findBestFreeRegister OMR::Z::Machine::assignBestRegisterSingle OMR::Z::Machine::assignBestRegister OMR::Z::Instruction::assignRegisterNoDependencies . This problem can only happen on IBM Z.
Local fix
Problem summary
During register assignment, if the register pressure is high, the JIT Compiler can run into a corner case where it is not able to allocate a specific register to satisfy an instruction dependency. This can result in a segmentation fault when trying to generate the corresponding instruction.
Problem conclusion
The JIT Compiler has been updated to handle the corner case and will now allocate the register correctly under a similar scenario. . This APAR will be fixed in the following Java Releases: 8 SR5 FP17 (8.0.5.17) . 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
IJ07682
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-07-09
Closed date
2018-07-09
Last modified date
2018-07-09
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:
09 July 2018