APAR status
Closed as program error.
Error description
Error Message: N/A . Stack Trace: N/A . A Java application hangs. The javacore dump shows: (1) The VM class table is locked by a JIT compilation thread: 2LKREGMON VM class table lock (0x7F836E70): Flat locked by "J IT Compilation Thread" (0x7F813A00), entry count 1 3LKWAITERQ Waiting to enter: 3LKWAITER "Signal Dispatcher" (0x7F836F00) 3LKWAITER "HungThreadDetectorForDeferrable Alarm" (0x7F 839500) 3LKWAITER "LT=0:P=821261:O=0:port=9109" (0x7F83F800) . . . (60+ threads waiting to enter) (2) The JIT compilation thread itself is waiting for another lock: 2LKREGMON JIT-CompilationQueueMonitor lock (0x7F832C20): <uno wned> 3LKNOTIFYQ Waiting to be notified 3LKWAITNOTIFY "JIT Compilation Thread" (0x7F813A00)
Local fix
Problem summary
Under rare circumstances, the JIT compilation thread locks the VM class table but does not release it before finishing a compilation.
Problem conclusion
The JIT compiler has been updated to release the VM class table lock in such situations. . This APAR will be fixed in the following Java Releases: 6 SR16 FP1 (6.0.16.1) 6 R1 SR8 FP1 (6.1.8.1) 7 SR7 FP1 (7.0.7.1) 7 R1 SR1 FP1 (7.1.1.1) . Contact your IBM Product's Service Team for these Service Refreshes and Fix Packs. For those running stand-alone, Java maintenance is available from: https://www.ibm.com/developerworks/java/jdk/
Temporary fix
Comments
APAR Information
APAR number
IV61659
Reported component name
JIT
Reported component ID
620700124
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2014-06-17
Closed date
2014-06-18
Last modified date
2014-07-16
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
R600 PSY
UP
R260 PSY
UP
R130 PSY
UP
[{"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":"6.0","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
16 July 2014