APAR status
Closed as program error.
Error description
Error Message: SIGSEGV in JIT compiled code. . Stack Trace: N/A . The problem can result in a crash in JIT compiled code or a crash in the Garbage Collector. The problem can only occur on PPC platforms (AIX and LinuxPPC) and only when using compressed references. The problem therefore can not occur in 32bit JVMs or when using large enough heaps where compressed references are not possible.
Local fix
Prevent the JVM from using compressed references. -Xnocompressedrefs This option will have a performance penalty of around 10% in most cases.
Problem summary
The JIT could fail to generate a compressed reference decompress code sequence right after loading the compressed reference from a heap object field. This could allow for a GC opportunity to exist between the field load and the decompress. A GC cycle at this point could resulting in stale references which would cause a crash in the JIT or in a future GC cycle.
Problem conclusion
The JIT was modified such that a GC opportunity would force a pending decompress to be generated prior to the GC opportunity. . This APAR will be fixed in the following Java Releases: 8 SR3 FP20 (8.0.3.20) 7 R1 SR3 FP60 (7.1.3.60) 7 SR9 FP60 (7.0.9.60) . 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
IJ13395
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-02-08
Closed date
2019-02-13
Last modified date
2019-02-13
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":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSNVBF","label":"Runtimes for Java Technology"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Line of Business":{"code":"LOB36","label":"IBM Automation"}}]
Document Information
Modified date:
14 December 2020