Hi Nenad,
I did set “_disable_hihghres_ticks” to true last week as I saw that as a
workaround in one the blog but post that also instance was terminated. I
will once again try in one of the non prod box and update you. Could this
be an issue with VM as post moving couple of VMs to a new host I don’t see
the problem again. Or do you suspect this to be an Oracle bug?
Thanks again Nenad, you have been so helpful!
Thanks,
Goti
On Thu, Aug 12, 2021 at 6:41 AM Goti <aryan.goti@xxxxxxxxx> wrote:
Hi Nenad,
I did set “_disable_hihghres_ticks” to true last week as I saw that as a
workaround in one the blog but post that also instance was terminated. I
will once again try in one of the non prod box and update you. Could this
be an issue with VM as post moving couple of VMs to a new host I don’t see
the problem again. Or do you suspect this to be an Oracle bug?
Thanks again Nenad, you have been so helpful!
Goti
On Thu, 12 Aug 2021 at 6:19 AM, Noveljic Nenad <
nenad.noveljic@xxxxxxxxxxxx> wrote:
Relink the Oracle software.--
*Von: *oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> im
namen von: Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
*Datum *Mittwoch, 11. Aug. 2021, 8:09 PM
*An: *Goti <aryan.goti@xxxxxxxxx>, 'Oracle L' <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>
*Datum *Mittwoch, 11. Aug. 2021, 3:28 PM
*An: *Noveljic Nenad <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> 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>
*Datum *Mittwoch, 11. Aug. 2021, 11:01 AM
*An: *Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
*Cc: *ORACLE-L <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> wrote:
Hi Nenad,Important Notice
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> 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 <oracle-l-bounce@xxxxxxxxxxxxx>
im namen von: Goti <aryan.goti@xxxxxxxxx>
*Datum *Mittwoch, 11. Aug. 2021, 8:54 AM
*An: *ORACLE-L <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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stated to the contrary and without prejudice to any contractual agreements
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as your consent to forward you commercial communications. You can exercise,
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referred to as "Vontobel Group") for any damages resulting from e-mail use
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printed version.
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are subject to electronic storage and review by Vontobel Group. Unless
stated to the contrary and without prejudice to any contractual agreements
between you and Vontobel Group which shall prevail in any case,
e-mail-communication is for informational purposes only and is not intended
as an offer or solicitation for the purchase or sale of any financial
instrument or as an official confirmation of any transaction.
The legal basis for the processing of your personal data is the
legitimate interest to develop a commercial relationship with you, as well
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rights. If you prefer not to receive any further communications, please
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Thanks,
Goti
