APAR status
Closed as program error.
Error description
Relockable mutexes exist to allow a thread to lock and unlock access to a protected resource multiple times. In normal use the number of calls to lock the mutex shall equal the number of calls to unlock it. Once the lock count becomes zero the mutex is available to other threads to acquire and lock it. If a program logic error results in too many calls to unlock the mutex a situation could arise whereby another thread could successfully lock and unlock the mutex but leave it in a state where it is recorded as the owner of the mutex when in fact it is not. The result is that a third thread that tries to lock and acquire the mutex will wait indefinitely. The following extract from onstat -g wmx, collected from a customer system, demonstrates the problem: Mutexes with waiters: mid addr name holder lkcnt waiter waittime 5507 7000014e9378808 bld ref constraint 1006101 -1 606382 56865 687553 56865 687476 56865 687558 56865 687530 56865 606379 56865 ... The thread that last locked the mutex, id 1006101, no longer existed when the problem was detected. Hence the other threads are forced to wait forever.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * All users. * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Update to IDS-11.70.xC9 * ****************************************************************
Problem conclusion
Problem Fixed In IDS-11.70.xC9
Temporary fix
Comments
APAR Information
APAR number
IC99364
Reported component name
INFORMIX SERVER
Reported component ID
5725A3900
Reported release
B70
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2014-02-13
Closed date
2017-06-09
Last modified date
2024-09-24
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
INFORMIX SERVER
Fixed component ID
5725A3900
Applicable component levels
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"B70","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
Document Information
Modified date:
24 September 2024