APAR status
Closed as program error.
Error description
Error Message: A segmentation fault in the JIT compiler (compile time). . Stack Trace: libj9jit29.so - OMR::CodeGenerator::decReferenceCount(TR::Node*)} libj9jit29.so - J9::Z::TreeEvaluator::pdloadEvaluator(TR::Node*,TR::CodeGenerato r*)} libj9jit29.so - OMR::CodeGenerator::evaluate(TR::Node*)} libj9jit29.so - J9::Z::TreeEvaluator::pdstoreEvaluator(TR::Node*,TR::CodeGenerat or*)} libj9jit29.so - J9::Z::TreeEvaluator::pdstoreiEvaluator(TR::Node*,TR::CodeGenera tor*)} libj9jit29.so - OMR::CodeGenerator::evaluate(TR::Node*)} libj9jit29.so - J9::CodeGenerator::doInstructionSelection()} libj9jit29.so - OMR::CodeGenPhase::performInstructionSelectionPhase(TR::CodeGene rator*,TR::CodeGenPhase*)} libj9jit29.so - OMR::CodeGenPhase::performAll()} libj9jit29.so - OMR::CodeGenerator::generateCode()} libj9jit29.so - OMR::Compilation::compile()} libj9jit29.so - TR::CompilationInfoPerThreadBase::compile(J9VMThread*,TR::Compil ation*,TR_ResolvedMethod*,T...} libj9jit29.so - TR::CompilationInfoPerThreadBase::wrappedCompile(J9PortLibrary*, void*)} . The problem can only occur running the zSeries IBM JVM on a z15 or newer CPU. Other (non-z) CPU architectures are not effect by this issue. The issue only occurs when the Java application is making use of the IBM Data Access Accelerator Library (DAA) to manipulate packed decimal values.
Local fix
The problem can be avoided by specifying the following java command line argument: -Xjit:disableVectorBCD This will have some performance effect on methods that are making use of the DAA API. The following environment variable can be used instead if performance is a concern. Using this environment variable is more targeted to the specific issue and will therefore have less of a performance impact: TR_DisablePdstoreVectorEvaluator=1
Problem summary
Under some scenarios when compiling methods with DAA code, the JIT will call decReferenceCount() against a null pointer resulting in a segmentation fault.
Problem conclusion
The JIT was modified so that it does not call decReferenceCount() under scenarios where the pdload operations are being evaluated. https://github.com/eclipse-openj9/openj9/pull/16287 . This APAR will be fixed in the following Releases: . IBM SDK, Java Technology Edition 8 SR8 (8.0.8.0) . Contact your IBM Product's Service Team for these Service Refreshes and Fix Packs. For those running stand-alone, information about the available maintenance can be found at: https://www.ibm.com/support/pages/java-sdk
Temporary fix
Comments
APAR Information
APAR number
IJ44532
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2022-12-07
Closed date
2022-12-08
Last modified date
2022-12-08
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"}],"Version":"130","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]
Document Information
Modified date:
09 December 2022