APAR status
Closed as program error.
Error description
Error Message: Assertion failed at OMRMemoryReference.cpp: Unexpected instruction type for long displacement on VLRL . Stack Trace: TR_MvsCallStackIterator::TR_MvsCallStackIterator() TR_Debug::printStackBacktrace() TR::fatal_assertion(const char*,int,const char*,const char*,...) OMR::Z::MemoryReference::generateBinaryEncoding() TR::S390VSIInstruction::generateBinaryEncoding() OMR::Z::CodeGenerator::doBinaryEncoding() . A SIGSEGV/GPF is also possible in OMR::Z::MemoryReference::generateBinaryEncoding() This problem only affects IBM Z systems from z13 and onwards. This problem was introduced in Java 8 SR5 This problem can only be encountered when the dataaccess API is used
Local fix
This problem can be avoided with the following command line option with minimal performance impact. -Xjit:disableVectorBCD
Problem summary
The JIT compiler uses vector instructions to accelerate the dataaccess API. One instruction it uses is VLRL. However, when the size of the memory reference offset needed is greater than 2K, VLRL cannot be used. Binary encoding lacked a case to handle this, putting it in an incorrect state. This is caught by a fatal assertion. In some cases the JIT compiler will crash while trying to throw the fatal assertion.
Problem conclusion
This problem is addressed by https://github.com/eclipse/omr/pull/3531 . This APAR will be fixed in the following Java Releases: 8 SR5 FP31 (8.0.5.31) . 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
IJ13156
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-01-30
Closed date
2019-02-07
Last modified date
2019-02-07
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
R130 PSY
UP
[{"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:
26 May 2020