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

Last updated on FEBRUARY 03, 2019

Applies to:

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


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.


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 >>


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