RE: VKTM background process terminating the DB instance.

From: Noveljic Nenad <nenad.noveljic_at_vontobel.com>
Date: Wed, 11 Aug 2021 08:20:55 +0000
Message-ID: <226fd4cc6e93444d9f9bb9d5990bac31_at_vontobel.com>

Strace shows the segmentation fault (sigsegv) which normally translates to ora-7445.

What are the last entries in the vktm trace?

Von: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org>> im namen von: Goti <aryan.goti_at_gmail.com<mailto:aryan.goti_at_gmail.com>> Datum Mittwoch, 11. Aug. 2021, 8:54 AM
An: ORACLE-L <oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org>> Betreff: VKTM background process terminating the DB instance.

Hi All,

Envt Details: DB version 12.1.0.2 Apr 2019 PSU , Running on VM RHEL 7.7

We have an issue wherein we have 6 DB instances running on different VM's sharing the same host getting terminated. The background process VKTM dies and subsequently PMON terminates the instance. Raised an SR with Oracle a couple of weeks back but so far they have not been able to find the root cause.Also i did follow some of the recommendations given the below MOS notes, but that also didn't help. Prior to VKTM getting terminated , the strace just shows "nanosleep({0, 1000000}, 0x7fff29abd7f0) = 0" in its trace file. Please find the below gist file which contains strace information of VKTM process just before it got terminated.

https://gist.github.com/aryangoti/7fd0882352e4d6e306d212ff1ab0a432

MOS Notes:

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Customer RecommendedVKTM processes consume High CPU (Doc ID 1992652.1)

Patch For Excessive VKTM And VKRM Traces In Bug 9382956 Requires Events (Doc ID 1381270.1)

Alert log snippet:

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Wed Aug 11 01:30:55 2021
Instance Critical Process (pid: 4, ospid: 8566, VKTM) died unexpectedly PMON (ospid: 8561): terminating the instance due to error 56703 Wed Aug 11 01:30:55 2021
System state dump requested by (instance=1, osid=8561 (PMON)), summary=[abnormal instance termination]. System State dumped to trace file /xxx/xxxxx/diag/rdbms/xxxx/xxxxx/trace/xxxx_diag_8576_20210811013055.trc Wed Aug 11 01:30:56 2021
Dumping diagnostic data in directory=[cdmp_20210811013055], requested by (instance=1, osid=8561 (PMON)), summary=[abnormal instance termination]. Wed Aug 11 01:30:57 2021
Instance terminated by PMON, pid = 8561

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Appreciate of i can get some help here!

Thanks,
Goti

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Received on Wed Aug 11 2021 - 10:20:55 CEST