RE: VKTM background process terminating the DB instance.
Date: Wed, 11 Aug 2021 18:09:04 +0000
Message-ID: <adca3f7a244d40a1a837dc84ac87a4c5_at_vontobel.com>
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_at_gmail.com<mailto:aryan.goti_at_gmail.com>>
Datum Mittwoch, 11. Aug. 2021, 3:28 PM
An: Noveljic Nenad <nenad.noveljic_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>>
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_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>> 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_at_gmail.com<mailto:aryan.goti_at_gmail.com>>
Datum Mittwoch, 11. Aug. 2021, 11:01 AM
An: Noveljic Nenad <nenad.noveljic_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>>
Cc: ORACLE-L <oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org>>
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_at_gmail.com<mailto:aryan.goti_at_gmail.com>> 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_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>> 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_at_freelists.org<mailto: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:
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
Please consider the environment before printing this e-mail. Bitte denken Sie an die Umwelt, bevor Sie dieses E-Mail drucken.
Important Notice
This message is intended only for the individual named. It may contain confidential or privileged information. If you are not the named addressee you should in particular not disseminate, distribute, modify or copy this e-mail. Please notify the sender immediately by e-mail, if you have received this message by mistake and delete it from your system. Without prejudice to any contractual agreements between you and us which shall prevail in any case, we take it as your authorization to correspond with you by e-mail if you send us messages by e-mail. However, we reserve the right not to execute orders and instructions transmitted by e-mail at any time and without further explanation. E-mail transmission may not be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete. Also processing of incoming e-mails cannot be guaranteed. All liability of Vontobel Holding Ltd. and any of its affiliates (hereinafter collectively referred to as "Vontobel Group") for any damages resulting from e-mail use is excluded. You are advised that urgent and time sensitive messages should not be sent by e-mail and if verification is required please request a printed version. Please note that all e-mail communications to and from the Vontobel Group 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 as your consent to forward you commercial communications. You can exercise, at any time and under the terms established under current regulation, your rights. If you prefer not to receive any further communications, please contact your client relationship manager if you are a client of Vontobel Group or notify the sender. Please note for an exact reference to the affected group entity the corporate e-mail signature. For further information about data privacy at Vontobel Group please consult www.vontobel.com<https://www.vontobel.com>.
Important Notice
This message is intended only for the individual named. It may contain confidential or privileged information. If you are not the named addressee you should in particular not disseminate, distribute, modify or copy this e-mail. Please notify the sender immediately by e-mail, if you have received this message by mistake and delete it from your system. Without prejudice to any contractual agreements between you and us which shall prevail in any case, we take it as your authorization to correspond with you by e-mail if you send us messages by e-mail. However, we reserve the right not to execute orders and instructions transmitted by e-mail at any time and without further explanation. E-mail transmission may not be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete. Also processing of incoming e-mails cannot be guaranteed. All liability of Vontobel Holding Ltd. and any of its affiliates (hereinafter collectively referred to as "Vontobel Group") for any damages resulting from e-mail use is excluded. You are advised that urgent and time sensitive messages should not be sent by e-mail and if verification is required please request a printed version. Please note that all e-mail communications to and from the Vontobel Group 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 as your consent to forward you commercial communications. You can exercise, at any time and under the terms established under current regulation, your rights. If you prefer not to receive any further communications, please contact your client relationship manager if you are a client of Vontobel Group or notify the sender. Please note for an exact reference to the affected group entity the corporate e-mail signature. For further information about data privacy at Vontobel Group please consult www.vontobel.com<https://www.vontobel.com>.
Important Notice
This message is intended only for the individual named. It may contain confidential or privileged information. If you are not the named addressee you should in particular not disseminate, distribute, modify or copy this e-mail. Please notify the sender immediately by e-mail, if you have received this message by mistake and delete it from your system. Without prejudice to any contractual agreements between you and us which shall prevail in any case, we take it as your authorization to correspond with you by e-mail if you send us messages by e-mail. However, we reserve the right not to execute orders and instructions transmitted by e-mail at any time and without further explanation. E-mail transmission may not be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete. Also processing of incoming e-mails cannot be guaranteed. All liability of Vontobel Holding Ltd. and any of its affiliates (hereinafter collectively referred to as "Vontobel Group") for any damages resulting from e-mail use is excluded. You are advised that urgent and time sensitive messages should not be sent by e-mail and if verification is required please request a printed version. Please note that all e-mail communications to and from the Vontobel Group 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 as your consent to forward you commercial communications. You can exercise, at any time and under the terms established under current regulation, your rights. If you prefer not to receive any further communications, please contact your client relationship manager if you are a client of Vontobel Group or notify the sender. Please note for an exact reference to the affected group entity the corporate e-mail signature. For further information about data privacy at Vontobel Group please consult www.vontobel.com <https://www.vontobel.com>.
-- http://www.freelists.org/webpage/oracle-lReceived on Wed Aug 11 2021 - 20:09:04 CEST