APAR status
Closed as program error.
Error description
Error Message: An unexpected java/lang/NullPointerException or a segmentation error is raised by JIT compiled code in the JVM . Stack Trace: N/A . This problem can only happen on z Systems on EC12 or later hardware
Local fix
This problem can be avoided by using the following Java option: -Xjit:disableZHelix This option disables the generation of instructions added in zEC12 hardware, thus it can potentially cause some performance degradation
Problem summary
When generating compiled code for an implicit null check, the JIT compiler can potentially do an extra de-reference before an LLGFAT instruction. If this happens, then one of two things are possible. The LLGFAT instruction will always trap meaning it will always throw a NullPointerException, or garbage will be loaded into a register which will very likely cause a segmentation error shortly afterwards.
Problem conclusion
The JIT compiler has been updated to prevent an erroneous extra de-reference before an LLGFAT instruction. . This APAR will be fixed in the following Java Releases: 7 SR10 (7.0.10.0) 7 R1 SR4 (7.1.4.0) 6 R1 SR10 (6.1.10.0) 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
IV86618
Reported component name
JIT
Reported component ID
620700124
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-07-06
Closed date
2016-07-06
Last modified date
2016-07-06
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
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Document Information
Modified date:
06 July 2016