APAR status
Closed as program error.
Error description
1XHEXCPCODE J9Generic_Signal_Number: 00000010 1XHEXCPCODE Signal_Number: 00000004 IAR: 0000000000008624 Java 1.8 process coredump due to Illegal Instruction at IAR '0x8624'. This happens when tprof event based is used. This happens because tprof -E is a global tool with respect to PMSVCS and pmsvcs does not restore java?s pmcontext into CPU when global tool is running. As pmcontext of java is not restored in to PMU mmcr0[PMCC] bit is set ?00? revoking the access to mmcr0 register in user space. When Java process tries to access the mmcr0 via ?_write_mmcr0_addr? routine it gets ILL INSTRUCTION EXCEPTION.
Local fix
power7 compat mode. OR Also as a workaround you could even disable RuntimeInstrumentation feature in IBM JAVA. -XX:-RuntimeInstrumentation
Problem summary
1XHEXCPCODE J9Generic_Signal_Number: 00000010 1XHEXCPCODE Signal_Number: 00000004 IAR: 0000000000008624 Java 1.8 process coredump due to Illegal Instruction at IAR '0x8624'. This happens when tprof event based profiling is used. This happens because tprof -E is a global tool with respect to PMSVCS and pmsvcs does not restore java s pmcontext into CPU when global tool is running.
Problem conclusion
Added the code to restore the access of mmcr0 Register in user space even when global tool is running
Temporary fix
Comments
APAR Information
APAR number
IV97095
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-06-09
Closed date
2017-06-09
Last modified date
2017-10-30
APAR is sysrouted FROM one or more of the following:
IV96353
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX V7.1
Fixed component ID
5765H4000
Applicable component levels
R710 PSY U878670
UP17/10/30 I 1000
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SG11R"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
Document Information
Modified date:
19 April 2022