|
Problem IT12202
|
Status: Closed |
DEADLOCK BETWEEN LISTENER AND LOWMEMORYMGR CAN CAUSE THE INSTANCE TO GET STUCK IN WAITING FOR THE 'SESSION' MUTEX
|
| product: |
INFORMIX SERVER / 5725A3900 / B70 - IDS 11.70 |
| Problem description: |
If you have the LOW_MEMORY_MGR set to 1 in your $ONCONFIG file,
the instance starts the LowMemoryMgr thread which looks for idle
and memory consuming sessions and kills them. There is a small
time window when the LowMemoryMgr thread can get into a deadlock
situation with one of the listener threads (sotcplst, sm_listen,
etc.). This can lead to the instance becoming unresponsive. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* low memory manager users *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Update to IBM Informix Server 11.70.xC9 *
**************************************************************** |
| Local Fix: |
Turn off the LMM feature. To stop the LowMemoryMgr thread run:
echo "execute function task('scheduler lmm disable')"|dbaccess
sysadmin
as the 'informix' user.
To prevent it to be spawned next time the instance is started
change the LOW_MEMORY_MRG parameter setting in your $ONCONFIG
file to:
LOW_MEMORY_MGR 0 |
| Solution |
|
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 10.11.2015
09.06.2017
09.06.2017 |
| Problem solved at the following versions (IBM BugInfos) |
11.70.xC9
|
| Problem solved according to the fixlist(s) of the following version(s) |
