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db1138 (s4 master) crashed due to memory issues
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Description

db1138 crashed mysql due to memory HW issues:

[33134188.608450] mce: [Hardware Error]: Machine check events logged
[33134188.608477] mce: Uncorrected hardware memory error in user-access at 7d3c38f580
[33134188.615864] {1}Hardware error detected on CPU2
[33134188.615874] {1}event severity: recoverable
[33134188.615875] {1} Error 0, type: recoverable
[33134188.615876] {1} fru_text: B4
[33134188.615876] {1}  section_type: memory error
[33134188.615877] {1}  error_status: 0x0000000000000400
[33134188.615878] {1}  physical_address: 0x0000007d3c38f580
[33134188.615880] {1}  node: 3 card: 0 module: 0 rank: 0 bank: 1 row: 55982 column: 1016
[33134188.615882] {1}  DIMM location: not present. DMI handle: 0x0000
[33134188.617181] Memory failure: 0x7d3c38f: Killing mysqld:163407 due to hardware memory corruption
[33134188.626049] Memory failure: 0x7d3c38f: recovery action for dirty LRU page: Recovered
[33134263.297543] MCE: Killing mysqld:163468 due to hardware memory corruption fault at 7feced3dc580
05/27/2020 20:20:26 Critical:  "Multi-bit memory errors detected on a memory device at location(s) DIMM_B4." in SEL on db1138

What I have done for now is:

  • Decreased buffer pool size to 300GB and restarted mysql.

Let's do a master failover on Friday to the candidate master.

@wiki_willy can we get a new DIMM for this host?

Details

SubjectRepoBranchLines +/-
db1138: Enable notificationsoperations/puppetproduction+0 -1
db1138: Disable notificationsoperations/puppetproduction+1 -0
wmnet: Update s4-master aliasoperations/dnsmaster+1 -1
mariadb: Promote db1081 to s4 masteroperations/puppetproduction+4 -4
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Event Timeline

• Marostegui created this task.May 27 2020, 8:34 PM
Restricted Application added a subscriber: Liuxinyu970226. · View Herald TranscriptMay 27 2020, 8:34 PM
CDanis triaged this task as High priority.May 27 2020, 8:36 PM
CDanis subscribed.
• Marostegui added a comment.May 27 2020, 8:39 PM

I am running a compare from this host to its candidate master (db1081) to make sure we are good for Friday.

• Marostegui added a project: Wikimedia-Incident.May 27 2020, 8:41 PM
• Marostegui moved this task from Triage to In progress on the DBA board.
MoritzMuehlenhoff mentioned this in T253810: Alert on ECC warnings in SEL.May 27 2020, 8:53 PM
wiki_willy assigned this task to Jclark-ctr.May 27 2020, 9:12 PM
wiki_willy added a comment.May 27 2020, 9:15 PM

@Marostegui - will do, Papaul and John are working on pulling the TSR right now for the RMA. Thanks, Willy

Jclark-ctr added a comment.May 27 2020, 11:31 PM

Sent TSR report to Dell
Confirmed: Service Request 1025886499 was successfully submitted.

gerritbot added a comment.May 28 2020, 4:56 AM

Change 599155 had a related patch set uploaded (by Marostegui; owner: Marostegui):
[operations/puppet@production] mariadb: Promote db1081 to s4 master

https://gerrit.wikimedia.org/r/599155

gerritbot added a project: Patch-For-Review.May 28 2020, 4:56 AM
gerritbot added a comment.May 28 2020, 4:58 AM

Change 599156 had a related patch set uploaded (by Marostegui; owner: Marostegui):
[operations/dns@master] wmnet: Update s4-master alias

https://gerrit.wikimedia.org/r/599156

• Marostegui added a comment.May 28 2020, 5:41 AM

Data check between db1138 and db1081 (candidate master) finished successfully.

• Marostegui added a comment.May 28 2020, 6:14 AM

Blocked a maintenance window on the deployment's calendar for tomorrow.

Stashbot added a comment.May 28 2020, 6:30 AM

Mentioned in SAL (#wikimedia-operations) [2020-05-28T06:30:38Z] <marostegui@cumin1001> dbctl commit (dc=all): 'Remove db1081 from API and set its weight to 0 on main traffic - preparation for tomorrow's failover T253808', diff saved to https://phabricator.wikimedia.org/P11329 and previous config saved to /var/cache/conftool/dbconfig/20200528-063037-marostegui.json

• Marostegui added a comment.May 28 2020, 7:39 AM

Incident report (draft status) created: https://wikitech.wikimedia.org/wiki/Incident_documentation/20200528-s4_(commonswiki)_on_read-only_for_8_minutes

• Marostegui closed subtask T253832: Create a wiki page with information on what to do when a master crashes and comes back as read only as Resolved.May 28 2020, 9:59 AM
Jclark-ctr added a comment.May 28 2020, 2:21 PM

fedex tracking says parts to arrive friday 5/29 @Marostegui would you want to do this tomorrow 3-4pm est. I would prefer not to take a host down on a friday afternoon or can we like to wait till next monday?

Trizek-WMF subscribed.May 28 2020, 2:50 PM
Johan subscribed.May 28 2020, 3:19 PM

@Jclark-ctr @Marostegui Does this mean you're not doing the 05:00 UTC window tomorrow? We've been informing the communities about this, and set banners, so we'd need to know ASAP if this is the case.

jcrespo subscribed.May 28 2020, 3:21 PM

@Johan plan continues as usual- @Jclark-ctr information is unrelated to the user impacting maintenance.

Johan added a comment.May 28 2020, 3:22 PM

OK, great, thanks.

jcrespo added a comment.May 28 2020, 3:22 PM

I talked to @Jclark-ctr on IRC, hw replacement will likely happen on Tuesday next week.

Sw emergency maintenance (read only) that is needed *before* hw maintenance is still tomorrow Friday 5am UTC.

Johan unsubscribed.May 28 2020, 3:43 PM
Agusbou2015 subscribed.May 28 2020, 10:24 PM
Stashbot added a comment.May 29 2020, 4:25 AM

Mentioned in SAL (#wikimedia-operations) [2020-05-29T04:25:19Z] <marostegui> Start topology changes in s4 - T253808

gerritbot added a comment.May 29 2020, 4:42 AM

Change 599155 merged by Marostegui:
[operations/puppet@production] mariadb: Promote db1081 to s4 master

https://gerrit.wikimedia.org/r/599155

Stashbot added a comment.May 29 2020, 5:00 AM

Mentioned in SAL (#wikimedia-operations) [2020-05-29T05:00:38Z] <marostegui> Starting s4 failover from db1138 to db1081 -T253808

Stashbot added a comment.May 29 2020, 5:01 AM

Mentioned in SAL (#wikimedia-operations) [2020-05-29T05:01:53Z] <marostegui@cumin1001> dbctl commit (dc=all): 'Set s4 as read-only for maintenance T253808', diff saved to https://phabricator.wikimedia.org/P11333 and previous config saved to /var/cache/conftool/dbconfig/20200529-050153-marostegui.json

Stashbot added a comment.May 29 2020, 5:02 AM

Mentioned in SAL (#wikimedia-operations) [2020-05-29T05:02:25Z] <marostegui@cumin1001> dbctl commit (dc=all): 'Promote db1081 to s4 master and remove read-only from s4 T253808', diff saved to https://phabricator.wikimedia.org/P11334 and previous config saved to /var/cache/conftool/dbconfig/20200529-050224-marostegui.json

gerritbot added a comment.May 29 2020, 5:06 AM

Change 599156 merged by Marostegui:
[operations/dns@master] wmnet: Update s4-master alias

https://gerrit.wikimedia.org/r/599156

• Marostegui closed subtask T253825: Emergency read-only time for s4 (commonswiki) as Resolved.May 29 2020, 5:07 AM

The master failover was done successfully.
This was done successfully
RO started at 05:01:54
RO stopped at 05:02:25

Total RO time: 31 seconds

db1138 is no longer s4 master and we can do the on-site maintenance on Tuesday if @Jclark-ctr is available, can you confirm?
I will leave db1138 depooled for the weekend.

Maintenance_bot removed a project: Patch-For-Review.May 29 2020, 5:10 AM
gerritbot added a comment.May 29 2020, 5:15 AM

Change 599583 had a related patch set uploaded (by Marostegui; owner: Marostegui):
[operations/puppet@production] db1138: Disable notifications

https://gerrit.wikimedia.org/r/599583

gerritbot added a project: Patch-For-Review.May 29 2020, 5:15 AM
gerritbot added a comment.May 29 2020, 5:18 AM

Change 599583 merged by Marostegui:
[operations/puppet@production] db1138: Disable notifications

https://gerrit.wikimedia.org/r/599583

Maintenance_bot removed a project: Patch-For-Review.May 29 2020, 6:10 AM
• Cmjohnson moved this task from Backlog to Hardware Failure / Troubleshoot on the ops-eqiad board.May 29 2020, 12:25 PM
• Marostegui added a comment.Jun 1 2020, 12:58 PM

@Jclark-ctr could you confirm if you want to do this maintenance today Monday 1st June or tomorrow Tuesday 2nd June?

• Marostegui added a comment.Jun 1 2020, 1:10 PM

John confirmed via IRC that the maintenance will be done on Tuesday - thank you!

Stashbot added a comment.Jun 2 2020, 7:06 AM

Mentioned in SAL (#wikimedia-operations) [2020-06-02T07:06:35Z] <marostegui> Stop MySQL and poweroff on db1138 for on-site maintenance - T253808

• Marostegui added a comment.Jun 2 2020, 7:09 AM

@Jclark-ctr db1138 is now off and ready for you to change the memory whenever you get to the DC.
Once you are done, please power the host back on and I will take it from there.

Thank you!

RhinosF1 subscribed.Jun 2 2020, 7:09 AM
Jclark-ctr added a comment.Jun 2 2020, 1:48 PM

@Marostegui Replaced failed DIMM. host is powered back on

• Marostegui added a comment.Jun 2 2020, 1:49 PM

Thank you, I will take it from here

gerritbot added a comment.Jun 3 2020, 5:01 AM

Change 601948 had a related patch set uploaded (by Marostegui; owner: Marostegui):
[operations/puppet@production] db1138: Enable notifications

https://gerrit.wikimedia.org/r/601948

gerritbot added a project: Patch-For-Review.Jun 3 2020, 5:01 AM
gerritbot added a comment.Jun 3 2020, 5:07 AM

Change 601948 merged by Marostegui:
[operations/puppet@production] db1138: Enable notifications

https://gerrit.wikimedia.org/r/601948

Stashbot added a comment.Jun 3 2020, 5:09 AM

Mentioned in SAL (#wikimedia-operations) [2020-06-03T05:09:12Z] <marostegui@cumin1001> dbctl commit (dc=all): 'Slowly repool db1138 T253808', diff saved to https://phabricator.wikimedia.org/P11369 and previous config saved to /var/cache/conftool/dbconfig/20200603-050911-marostegui.json

Maintenance_bot removed a project: Patch-For-Review.Jun 3 2020, 5:10 AM
Stashbot added a comment.Jun 3 2020, 5:37 AM

Mentioned in SAL (#wikimedia-operations) [2020-06-03T05:37:48Z] <marostegui@cumin1001> dbctl commit (dc=all): 'Slowly repool db1138 T253808', diff saved to https://phabricator.wikimedia.org/P11370 and previous config saved to /var/cache/conftool/dbconfig/20200603-053748-marostegui.json

Stashbot added a comment.Jun 3 2020, 6:01 AM

Mentioned in SAL (#wikimedia-operations) [2020-06-03T06:01:25Z] <marostegui@cumin1001> dbctl commit (dc=all): 'Slowly repool db1138 T253808', diff saved to https://phabricator.wikimedia.org/P11373 and previous config saved to /var/cache/conftool/dbconfig/20200603-060124-marostegui.json

Stashbot added a comment.Jun 3 2020, 6:37 AM

Mentioned in SAL (#wikimedia-operations) [2020-06-03T06:37:52Z] <marostegui@cumin1001> dbctl commit (dc=all): 'Fully repool db1138 T253808', diff saved to https://phabricator.wikimedia.org/P11374 and previous config saved to /var/cache/conftool/dbconfig/20200603-063752-marostegui.json

• Marostegui closed this task as Resolved.Jun 3 2020, 7:26 AM

Host repooled. All done.
Thanks John for replacing the memory!

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