Fixes are available
APAR status
Closed as program error.
Error description
You get an FDC with probe XC130004 when you stop all of the active channels in order to perform a media backup of the qmgr. . The FDC's show the following pattern: XC130004 xehExceptionHandler SIGSEGV: address not mapped ZL043050 zlaMainThread ZL043105 zlaMainThread The stack for the XC130004 will include the following functions: zsqSPICancelWaiter kpiCancelWaiter kqiWakeUpWaiter xcsFFST .
Local fix
Problem summary
**************************************************************** USERS AFFECTED: The kqiWakeUpWaiter function is called during a request to stop a channel abruptly, typically either as a result of a STOP CHL MODE(TERMINATE) | MODE(FORCE), or perhaps due to AdoptMCA processing. Platforms affected: All Distributed (iSeries, all Unix and Windows) **************************************************************** PROBLEM SUMMARY: The locking which stops a queue from changing state while a request to cancel a thread which is waiting for a message to arrive on that queue was incorrect, leaving a small window where a change in the queue state could result in the queue manager accessing uninitialized memory.
Problem conclusion
Cancelling a waiting MQGET is not a performance sensitive operation, hence there is no need for fine grained locking in this function and the code has been changed to hold the queue lock for the duration of the search for the waiting MQGET. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: v6.0 Platform Fix Pack 6.0.2.3 -------- -------------------- Windows U200279 AIX U811346 HP-UX (PA-RISC) U811630 HP-UX (Itanium) U811631 Solaris (SPARC) U811632 Solaris (x86-64) U811633 iSeries SI27288 Linux (x86) U811634 Linux (x86-64) U811635 Linux (zSeries) U811636 Linux (Power) U811637 Linux (s390x) U811638 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
IZ01599
Reported component name
WMQ LIN X86 V6
Reported component ID
5724H7204
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2007-07-17
Closed date
2007-07-25
Last modified date
2007-07-30
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 LIN X86 V6
Fixed component ID
5724H7204
Applicable component levels
R600 PSY
UP
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.0","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
31 March 2023