APAR status
Closed as program error.
Error description
Error Message: The application hangs, i.e., no progress is made by the application, with no error message. . Stack Trace: N/A .
Local fix
-Xjit:disableAsyncCheckRemoval works around this problem but it may cause slight performance degradation.
Problem summary
This problem may occur when a trusted method (i.e., a method in String, HashMap, or TreeMap classes) that contains a loop is inlined in user code. With low probability, the JIT generates a code for the user loop that doesn't have a GC point. Now if other threads are waiting for GC to happen, and the user code doesn't progress until something happens in the other threads, there will be a deadlock. In other words, GC is waiting for user loop which is waiting for other threads which are waiting for GC.
Problem conclusion
This defect will be fixed in: 7.0.0 SR2 6.0.0 SR11 6.0.1 SR2 5.0.0 SR14 . The check that JIT uses to detect whether a loop has come from a trusted method has been made more accurate.
Temporary fix
Comments
APAR Information
APAR number
IV20922
Reported component name
JAVA 5 JIT
Reported component ID
620500124
Reported release
500
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-05-10
Closed date
2012-05-21
Last modified date
2012-05-21
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
JAVA 5 JIT
Fixed component ID
620500124
Applicable component levels
R500 PSY
UP
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Document Information
Modified date:
21 May 2012