Fixes are available
APAR status
Closed as program error.
Error description
WebSphere MQ queue managers running in a Windows domain environment become unresponsive as a result of a lack of response from the Domain controller. Applications connecting to WebSphere MQ queue managers are sometimes unable to connect and/or reconnect to the queue manager. Many FDCs will be generated with data similar to the following: Probe Id :- XC307100 Component :- xlsRequestMutex Process Name :- ....\amqzlaa0.exe Major Errorcode :- xecL_W_LONG_LOCK_WAIT Probe Type :- MSGAMQ6150 Probe Severity :- 3 Probe Description :- AMQ6150: WebSphere MQ semaphore is busy. FDCSequenceNumber :- 11 ----------------------- MQM Function Stack zlaMainThread zlaProcessMessage zlaProcessMQIRequest zlaMQCONN zsqMQCONN kpiMQCONN kqiAuthorityChecks gpiCheckObjectAuthority zfu_as_checkobjectauthority zfu_as_calculateauthority zfuLockHashTable xlsRequestMutex xcsFFST +------------------+ Probe Id :- XC308010 Component :- xlsReleaseMutex Process Name :- ...\amqzlaa0.exe Major Errorcode :- xecL_W_LONG_LOCK_WAIT Probe Type :- MSGAMQ6150 Probe Severity :- 3 Probe Description :- AMQ6150: WebSphere MQ semaphore is busy. FDCSequenceNumber :- 5 ---------------------- MQM Function Stack zlaMainThread zlaProcessMessage zlaProcessSPIRequest zlaSPIKernel zsqSPIKernel kpiGeneric kqiCheckPrivileged gpiCheckPrivileged zfu_as_CheckPrivileged zfu_as_calculateauthority zfuUnlockHashTable xlsReleaseMutex xcsFFST If a WebSphere MQ trace is collected it can be identified that a WebSphere MQ agent process thread is hanging in the function xcsTimedLookupAccountName(). This in turn is blocking other threads requiring interprocess shared memory.
Local fix
Problem summary
**************************************************************** USERS AFFECTED: All users of IBM WebSphere MQ with a domain controller, or active directory controller, which can be very slow to respond to requests. Platforms affected: Windows **************************************************************** PROBLEM SUMMARY: A queue manager wide lock was taken prior to making a query to the domain controller for user information, which was expected to complete very quickly. All new MQI operations are blocked whilst this query was completed, meaning that when the domain controller took a long time to respond, the queue manager appeared to hang and new work was not processed.
Problem conclusion
The locking in the code area which is responsible for querying the domain controller has been altered to ensure that the lock which was preventing other MQI calls from proceeding is not held whilst a request is made outside of MQ to the domain controller. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v7.1 7.1.0.6 v7.5 7.5.0.4 The latest available maintenance can be obtained from 'WebSphere MQ Recommended Fixes' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037 If the maintenance level is not yet available information on its planned availability can be found in 'WebSphere MQ Planned Maintenance Release Dates' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IC98984
Reported component name
WMQ WINDOWS V7
Reported component ID
5724H7220
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2014-01-27
Closed date
2014-02-21
Last modified date
2014-02-21
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
WMQ WINDOWS V7
Fixed component ID
5724H7220
Applicable component levels
R710 PSY
UP
[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.1"}]
Document Information
Modified date:
09 March 2021