ASM and Database Instance hang when exceeding around 1800 sessions (Doc ID 858279.1)

Last updated on AUGUST 17, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.1 to 11.1.0.7 [Release 10.2 to 11.1]
Information in this document applies to any platform.

Symptoms


Symptom I

ASM and Database Instance hang due to waiting for cssd. Many sessions hang with stack going into clsssinit()

ASM Instance blocker process waits for cssd

Blocker process call stack :

<-nsevwait() <-clsc_nswait() <-clsc_select_ext() <-clsc_receive_wait() <-clscreceive() <-clscconnect()
<-clsssInitNative()+1682<-clsssinit() <-kgxgncin() <-kfmsInit() <-kfmsSlvReg() <-kfmdSlvOpPriv() <-kfmEnslave()  <-kfddsGet() <-kfdParallelIO()+895<-kfdDiscoverDeep() <-kfgDiscoverDeep() <-kfgDiscoverGroup() <-kfgTableCb() <-kfgGrpTableCb() <-qerfxFetch() <-qersoProcessULS() <-qersoFetch() <-opifch2() <-kpoal8() <-opiodr() <-ttcpip() <-opitsk() <-opiino() <-opiodr() <-opidrv <-sou2o() <-opimai_real() <-ssthrdmain() <-main() <-__libc_start_main() <-_start()


Symptom II


WARNING:Oracle instance running on a system with low open file descriptor
limit. Tune your system to increase this limit to avoid
severe performance degradation.


This issue can happen on both RAC and nonRAC set up.

Changes

Note that this problem will occur even with the fix for the <Bug 4462367> where the following code was added:

# Allow the daemon to drop a diagnostic core file
ulimit -c unlimited
ulimit -n unlimited << this line >>

Cause

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