APAR status
Closed as program error.
Error description
Error Message: SIGSEGV received while JIT compiling a method. . Stack Trace: {libj9jit29.so}{instanceOfOrCheckCast} {libj9jit29.so}{jitCTInstanceOf} {libj9jit29.so}{TR_J9VM::isInstanceOf(TR_OpaqueClassBlock*,TR_Op aqueClassBlock*,bool,bool,bool)} {libj9jit29.so}{J9::ValuePropagation::constrainRecognizedMethod( TR::Node*)} {libj9jit29.so}{constrainCall(OMR::ValuePropagation*,TR::Node*)} {libj9jit29.so}{OMR::ValuePropagation::launchNode(TR::Node*,TR:: Node*,int)} {libj9jit29.so}{constrainChildren(OMR::ValuePropagation*,TR::Nod e*)} {libj9jit29.so}{OMR::ValuePropagation::launchNode(TR::Node*,TR:: Node*,int)} {libj9jit29.so}{OMR::ValuePropagation::processTrees(TR::TreeTop* ,TR::TreeTop*)} {libj9jit29.so}{TR::GlobalValuePropagation::processBlock(TR_Stru ctureSubGraphNode*,bool,bool)} {libj9jit29.so}{TR::GlobalValuePropagation::processStructure(TR_ StructureSubGraphNode*,bool,bool)} {libj9jit29.so}{TR::GlobalValuePropagation::processRegionNode(TR _StructureSubGraphNode*,bool,bool)} {libj9jit29.so}{TR::GlobalValuePropagation::processRegionNode(TR _StructureSubGraphNode*,bool,bool)} .
Local fix
The problem can be avoided by setting the following environment variable before starting the JVM. TR_disableVPFoldRecognizedMethod=1 This option will cause the JIT to disable a small optimization where the issue exists. This option may show a minor effect on performance.
Problem summary
In some cases an class that is still unresolved at JIT compile time can result in a NULL pointer to be dereferenced causing a SIGSEGV to occur.
Problem conclusion
The JIT was modified such that it will not attempt this particular optimization unless the classes involved are resolved. . This APAR will be fixed in the following Java Releases: 8 SR5 FP41 (8.0.5.41) . 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
IJ18018
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-07-30
Closed date
2019-08-26
Last modified date
2019-08-26
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":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"130","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
26 August 2019