APAR status
Closed as program error.
Error description
Error Message: JVM crashes while throwing a ClassCastException on x86 64 bit with compressed references. System corefile analysis will find that one of the two class pointers has the high bits set (0xFFFFFFFF????????). . Stack Trace: The native callstack will include jitThrowClassCastException .
Local fix
The problem can be avoided by using the JVM command line option -Xjit:disableInlineCheckcast Note that there can only be one -Xjit on the command line, so if necessary multiple options can be combined with commas. Alternatively, disabling compressed references will also avoid the problem. -Xnocompressedrefs
Problem summary
When creating a class cast exception the 32 bit constant class pointer was passed to a helper method using a push immediate instruction. Unfortunately this instruction sign extends the 32 bit value to 64 bits, so if a class pointer is allocated in memory above 2GB the called code fails while attempting to read from an incorrect pointer value.
Problem conclusion
The x86 code generator was modified to use a different instruction sequence when passing class pointers that are in memory above 2GB. . This APAR will be fixed in the following Java Releases: 8 SR6 (8.0.6.0) . 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
IJ19899
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-09-26
Closed date
2019-10-03
Last modified date
2019-10-03
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:
03 October 2019