Fixes are available
8.5.5.4: WebSphere Application Server V8.5.5 Fix Pack 4
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
8.5.5.6: WebSphere Application Server V8.5.5 Fix Pack 6
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.15: WebSphere Application Server V8.5.5 Fix Pack 15
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
8.5.5.17: WebSphere Application Server V8.5.5 Fix Pack 17
8.5.5.20: WebSphere Application Server V8.5.5.20
8.5.5.18: WebSphere Application Server V8.5.5 Fix Pack 18
8.5.5.19: WebSphere Application Server V8.5.5 Fix Pack 19
8.5.5.16: WebSphere Application Server V8.5.5 Fix Pack 16
8.5.5.21: WebSphere Application Server V8.5.5.21
APAR status
Closed as program error.
Error description
When trace is enabled on Websphere Application Server that utilizes the Service Integration Bus objectmanager, deadlock occurs between the following threads: CheckpointHelper: at com/ibm/wbe/objectManager/TreeMap.size(TreeMap.java:242) at com/ibm/wbe/objectManager/AbstractMap.toString(AbstractMap.java: 394) at com/ibm/wbe/objectManager/utils/TraceImpl.getObjectArrayMsg(Trac eImpl.java:44) at com/ibm/wbe/objectManager/utils/TraceImpl.entry(TraceImpl.java:1 31) at com/ibm/wbe/objectManager/SingleFileObjectStore.write(SingleFile ObjectStore.java:604) at com/ibm/wbe/objectManager/AbstractSingleFileObjectStore.updateDi rectory(AbstractSingleFileObjectStore.java:1252) at com/ibm/wbe/objectManager/AbstractSingleFileObjectStore.flush(Ab stractSingleFileObjectStore.java:1145) at com/ibm/wbe/objectManager/ObjectManagerState.performCheckpoint(O bjectManagerState.java:928) .. .. RulesEngineThread-7: at com/ibm/wbe/objectManager/AbstractSingleFileObjectStore.reserve( AbstractSingleFileObjectStore.java:769) at com/ibm/wbe/objectManager/TreeMap.remove(TreeMap.java:1018) at com/ibm/wbe/server/engine/store/om/ConcurrentHashMap.remove(Conc urrentHashMap.java:229) .. ..
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: Users of the default messaging provider * * for IBM WebSphere Application Server V8.0 * * and v8.5. * **************************************************************** * PROBLEM DESCRIPTION: Deadlock between ObjectManager and * * WebSphere Business Events (WBE) * * RuleEngine threads when tracing * * enabled. * **************************************************************** * RECOMMENDATION: * **************************************************************** As per the "CheckpointHelper" thread in the stacktrace, the TraceImpl.entry() method prints the method entry trace for SingleFileObjectStore.write() method. It performs a .toString() operation which locks "TreeMap" to get the list of entries locked by the transaction, adjust the size of the tree, and then print the size. However, there is no need to lock the "TreeMap" as the .toString() method invokes the TreeMap.size() with a transaction id as an argument which is passed as "null".
Problem conclusion
Source code has been modified not to lock the "TreeMap" object when the passed transaction is "null". The fix for this APAR is currently targeted for inclusion in fix packs 8.0.0.10 and 8.5.5.4. Please refer to the Recommended Updates page for delivery information: http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
Temporary fix
Remove "ObjectManager*=all" tracing (or) Disable class level tracing by adding, com.ibm.wbe.objectManager.SingleFileObjectStore=all=disabled
Comments
APAR Information
APAR number
PI17537
Reported component name
WAS SIB & SIBWS
Reported component ID
620800101
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2014-05-08
Closed date
2014-08-18
Last modified date
2014-11-03
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
WAS SIB & SIBWS
Fixed component ID
620800101
Applicable component levels
R800 PSY
UP
R850 PSY
UP
Document Information
Modified date:
28 April 2022