APAR status
Closed as program error.
Error description
Error Message: Incorrect code path was executed after a conditional statement using "instanceof" with "object <OSB><CSB><OSB><CSB>" as the right hand side of the operation. . Stack Trace: N/A . The problem occurred only with Java 8 SR5 or later and can only happen on PowerPC and zSeries machines (AIX / zOS / LinuxPPC / zLinux). The issue does not occur on X86. The problem can only occur when the right hand side type is a subclass of the left hand side object and both sides are arrays of 2 or more dimensions.
Local fix
The problem can only be avoided by preventing the method with the instanceof check from being JIT compiled: i.e. -Xjit:exclude={package/class.method*},dontinline={package/class. method*}
Problem summary
The JIT would generate an insufficient number of checks for an instanceof when the right hand side type is a 2 or more dimension array type (i.e. Object <OSB><CSB><OSB><CSB>).
Problem conclusion
The JIT was modified to emit the correct checks for instanceof instructions involving multi-dimension arrays. . This APAR will be fixed in the following Java Releases: 8 SR5 FP15 (8.0.5.15) . 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
IJ05529
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-04-06
Closed date
2018-05-10
Last modified date
2018-05-10
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:
10 May 2018