APAR status
Closed as program error.
Error description
Error Message: A GPF event is received when the JVM is trying to write to the shared classes cache. . Stack Trace: The native stack trace looks like this: j9vm29!j9shr_Query_IsAddressInCache+0x29 j9vm29!ComparingCursor::isRangeValidForUTF8Ptr() j9vm29!ComparingCursor::writeSRP() j9vm29!ROMClassWriter::ConstantPoolWriter::visitString() j9vm29!ConstantPoolMap::constantPoolDo() j9vm29!ROMClassWriter::writeConstantPool+0x7a j9vm29!ROMClassWriter::writeROMClass() j9vm29!ROMClassBuilder::compareROMClassForEquality+0x136 j9vm29!ROMClassBuilder::prepareAndLaydown() j9vm29!ROMClassBuilder::buildROMClass() j9vm29!j9bcutil_buildRomClass() .
Local fix
The issue can be worked around using option -Xshareclasses:none to disable the shared classes cache.
Problem summary
The problem is caused when JVM tries to read the content of the memory before it ensures the memory is accessible.
Problem conclusion
The JVM has been updated so that the JVM ensures the memory is accessible before the JVM reads the memory content. . This APAR will be fixed in the following Java Releases: 8 SR6 FP25 (8.0.6.25) . 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
IJ29969
Reported component name
J9 COMMON CODE
Reported component ID
620700127
Reported release
270
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-12-16
Closed date
2020-12-21
Last modified date
2020-12-21
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
J9 COMMON CODE
Fixed component ID
620700127
Applicable component levels
R270 PSY
UP
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Document Information
Modified date:
21 February 2022