A fix is available
APAR status
Closed as program error.
Error description
When running Websphere Application Server zOS, the com/ibm/ws/asynchbeans/services/wlm/EnclaveManager goes into a deadlock with two threads causing the server to hang and eventually timeout with an EC3/04130007. The external symptoms would be a server hang/timeout with the below. BBOO0327I HTTP REQUEST TIMEOUT: (0301):(FCCD51ED):(0001001D):(009B6088):(STC64556): (2011/01/29 21:45:01.811575):(2011/01/29 21:45:02.046377): (2011/01/29 21:45:02.054852):(RemoteWebContainer):(httprequest): (ipaddr=a.b.b.d port=xxxx):():():(/aaaaa/bbbbb) When extracted the javacore from the EC3 dump we found the below deadlock contention. 1LKDEADLOCK Deadlock detected !!! NULL --------------------- NULL 2LKDEADLOCKTHR Thread "java.lang.ThreadGroup[name=DefaultWorkManager: CWS_LOGON_EAR,maxpri=10]" (0x4EFFCC00) 3LKDEADLOCKWTR is waiting for: 4LKDEADLOCKMON sys_mon_t:0x5113A2AC infl_mon_t: 0x5113A2EC: 4LKDEADLOCKOBJ java/util/HashMap@36548D18/36548D24: 3LKDEADLOCKOWN which is owned by: 2LKDEADLOCKTHR Thread "WebSphere:ORB.thread.pool t=009be9d8" (0x527A0500) 3LKDEADLOCKWTR which is waiting for: 4LKDEADLOCKMON sys_mon_t:0x5113A7FC infl_mon_t: 0x5113A83C: 4LKDEADLOCKOBJ com/ibm/ws/asynchbeans/services/wlm/Enclave@2EAE7F80/2EAE7F8C: 3LKDEADLOCKOWN which is owned by: 2LKDEADLOCKTHR Thread "java.lang.ThreadGroup[name=DefaultWorkManager: CWS_LOGON_EAR,maxpri=10]" (0x4EFFCC00)
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM WebSphere Application Server * V7.0 * **************************************************************** * PROBLEM DESCRIPTION: At times a deadlock is reported when * * using Classifiction Service in * * AsynchBeans. * **************************************************************** * RECOMMENDATION: * **************************************************************** There is a circular reference in the EnclaveManager code of Classification Service that could lead to deadlock, when two threads simultaneously work on the single object of this class.
Problem conclusion
The problem is fixed by avoiding circular reference. APAR PM35239 is currently targeted for inclusion in Service Level (Fix Pack) 7.0.0.19 of WebSphere Application Server V7.0. Please refer to URL: //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970 for Fix Pack availability.
Temporary fix
Comments
APAR Information
APAR number
PM35239
Reported component name
WEBSPHERE FOR Z
Reported component ID
5655I3500
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-03-21
Closed date
2011-05-10
Last modified date
2011-10-04
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
WEBSPHERE FOR Z
Fixed component ID
5655I3500
Applicable component levels
R700 PSY UK71280
UP11/09/10 P F109
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SS7K4U","label":"WebSphere Application Server for z\/OS"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
10 February 2022