APAR status
Closed as program error.
Error description
Error Message: j> 12:18:09 Unhandled exception j> 12:18:09 Type=Segmentation error vmState=0x00054fff . Stack Trace: N/A . Failing test was run using the "enableGPU={enforce<PIPE>verbose}" Xjit option.
Local fix
Two choices for a workaround: 1. Do not use the "-Xjit:enableGPU={enforce}" option. Just "-Xjit:enableGPU" is still okay. This may prevent Java from offloading code to the GPU when normally it could. 2. Use "-Xjit:disableAutoSIMD" option. This will disable the use of vector instructions to parallelize qualified loops.
Problem summary
If the "enableGPU={enforce}" Xjit option is used to enforce the use of JIT GPU, it can sometimes confuse the AutoSIMD optimization (which is on be default) that tries to automatically parallelize loops with vector instructions. This happens when both optimizations try to act on the same loop and leads to a segmentation fault.
Problem conclusion
The AutoSIMD optimization was updated to understand what the JIT GPU optimization did and back off instead of segfaulting. . This APAR will be fixed in the following Java Releases: 8 SR5 FP30 (8.0.5.30) . 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
IJ14008
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-02-19
Closed date
2019-02-19
Last modified date
2019-02-19
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:
19 February 2019