Relink the Oracle software.
Von: oracle-l-bounce@xxxxxxxxxxxxx
<oracle-l-bounce@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>> im namen
von: Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>>
Datum Mittwoch, 11. Aug. 2021, 8:09 PM
An: Goti <aryan.goti@xxxxxxxxx<mailto:aryan.goti@xxxxxxxxx>>, 'Oracle L'
<oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
Betreff: RE: VKTM background process terminating the DB instance.
Sltrgftime64_cgt tried to jump to an invalid program address. This function is
a wrapper for the OS function for getting high resolution time. I‘ll check this
function in detail in a couple of weeks.
This function was called by kstmhighrestimecntk. You could try to disable the
high resolution ticker by setting _disable_highres_ticks to TRUE as a
workaround. I’ve never done this. Do it on a test system first to see if there
are any side-effects.
Von: Goti <aryan.goti@xxxxxxxxx<mailto:aryan.goti@xxxxxxxxx>>
Datum Mittwoch, 11. Aug. 2021, 3:28 PM
An: Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>>
Betreff: Re: VKTM background process terminating the DB instance.
Hi Nenad,
Below you can find the call stack trace. Thanks again!
https://gist.github.com/aryangoti/5734ad46a8eb513b7d239d321b7ea003
Thanks,
Goti
On Wed, Aug 11, 2021 at 6:07 PM Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>> wrote:
Could you post the call stack for ora-07445? It should be in one of the
trace/incident files. This will provide the clue.
With regard to the different behavior on a different host:
- Are the patch levels the same? (Vktm relies on OS kernel functions, like
nanosleep)
- Could you compare the spfiles on both servers? (Vktm increments the time
counters in SGA. There are some undocumented parameters that define the time
resolution.)
Von: Goti <aryan.goti@xxxxxxxxx<mailto:aryan.goti@xxxxxxxxx>>
Datum Mittwoch, 11. Aug. 2021, 11:01 AM
An: Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>>
Cc: ORACLE-L <oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
Betreff: Re: VKTM background process terminating the DB instance.
Hi Nenad,
Sorry there was typo below. Below is the correct VKTM trace file. And yes you
are right there is ORA-07445 reported. But not sure why we are not getting this
issue for the DB instances after we moved to a different host.
kstmmainvktm: succeeded in setting elevated priority
Verify: SETUID is set on ORADISM and restart the instance
highres_enabled
*** 2021-08-11 01:31:04.534
VKTM running at (1)millisec precision with DBRM quantum (100)ms
[Start] HighResTick = 35067506276
kstmrmtickcnt = 0 : ksudbrmseccnt[0] = 1628645464
*** 2021-08-11 04:36:31.842
Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x7F03344687D0]
[PC:0x7F03344687D0, {empty}] [flags: 0x0, count: 1]
Incident 1800033 created, dump file:
/n02/base/diag/rdbms/xxxx/xxxxx/incident/incdir_1800033/xxxx_vktm_14386_i1800033.trc
ORA-07445: exception encountered: core dump [PC:0x7F03344687D0] [SIGSEGV]
[ADDR:0x7F03344687D0] [PC:0x7F03344687D0] [Address not mapped to object] []
ssexhd: crashing the process...
Background_Core_Dump = partial
Thanks,
Goti
On Wed, Aug 11, 2021 at 1:56 PM Goti
<aryan.goti@xxxxxxxxx<mailto:aryan.goti@xxxxxxxxx>> wrote:
Hi Nenad,
Thanks for responding.
Below is the VKTM trace. BTW forgot to mention that, we moved a couple of DB
instances to another host post which those DB instances are not getting
terminated.
VKTM Trace:
kstmmainvktm: succeeded in setting elevated priority
Verify: SETUID is set on ORADISM and restart the instance
highres_enabled
*** 2021-08-11 04:36:49.798
VKTM running at (1)millisec precision with DBRM quantum (100)ms
[Start] HighResTick = 46212770348
kstmrmtickcnt = 0 : ksudbrmseccnt[0] = 1628656609
Thanks,
Goti
On Wed, Aug 11, 2021 at 1:51 PM Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>> wrote:
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@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>
<oracle-l-bounce@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>> im namen
von: Goti <aryan.goti@xxxxxxxxx<mailto:aryan.goti@xxxxxxxxx>>
Datum Mittwoch, 11. Aug. 2021, 8:54 AM
An: ORACLE-L <oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>>
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:
==============
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:
========================
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
==============================================================
Appreciate of i can get some help here!
Thanks,
Goti
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