Fixes are available
APAR status
Closed as program error.
Error description
A security exit is defined in a channel server connection (SVRCONN). When a Websphere MQ client application tries to connect to the queue manager and it is not authorized, the security exit closes the connection. The application receives error MQRC = 2538 (MQRC_HOST_NOT_AVAILABLE) and the following message is written in AMQERR01.LOG of the queue manager: AMQ9536: Channel ended by an exit. EXPLANATION: Channel program 'channe_name' was ended by exit 'exit_name' ACTION: None. Memory used by the amqrmppa process is not freed and if there are a lot of connections closed by the security exit, then consumption continues to grow. If the issue is not fixed then the channel process might exhaust available memory and WebSphere MQ may produce memory allocation FDCs. If the problem is found to be being caused by a security exit closing connections then it may be possible to work around the issue by either disabling the exit or setting the SHARECNV value of the affected channel to zero.
Local fix
Set SHARECNV=0 in channel server connection (SVRCONN) definition.
Problem summary
**************************************************************** USERS AFFECTED: Users who have installed security exits that may cause connections to be refused are at particular risk of hitting this problem, although it may in theory occur in other channel failure scenarios. The impact to a system will be determined on how frequently connections are being ended by the security exit. Platforms affected: All Distributed (iSeries, all Unix and Windows) **************************************************************** PROBLEM SUMMARY: Channels that are run with a SHARECNV of greater than zero were not freeing the receive buffer if an error was being returned from a WebSphere MQ function call.
Problem conclusion
The WebSphere MQ channel code was changed so that it attempts to free the receive buffer regardless of the return value of other function calls. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: v7.0 Platform Fix Pack 7.0.1.8 -------- -------------------- Windows U200335 AIX U845856 HP-UX (PA-RISC) U847965 HP-UX (Itanium) U847970 Solaris (SPARC) U847966 Solaris (x86-64) U847972 iSeries 7.0.1.8 Linux (x86) U847967 Linux (x86-64) U847971 Linux (zSeries) U847968 Linux (Power) U847969 v7.1 Platform Fix Pack 7.1.0.1 -------- -------------------- Windows 7.1.0.1 AIX 7.1.0.1 HP-UX (PA-RISC) 7.1.0.1 HP-UX (Itanium) 7.1.0.1 Solaris (SPARC) 7.1.0.1 Solaris (x86-64) 7.1.0.1 iSeries 7.1.0.1 Linux (x86) 7.1.0.1 Linux (x86-64) 7.1.0.1 Linux (zSeries) 7.1.0.1 Linux (Power) 7.1.0.1 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
IV10032
Reported component name
WMQ AIX V7
Reported component ID
5724H7221
Reported release
701
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-11-03
Closed date
2011-12-16
Last modified date
2012-01-19
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 AIX V7
Fixed component ID
5724H7221
Applicable component levels
R701 PSY
UP
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Document Information
Modified date:
31 March 2023