Intermittent errors when trying to submit a MR review or diff comment

Summary

For a customer (internal), sometimes when trying to submit an MR review with multiple comments, or just trying to submit a single diff comment directly, fails silently. Subsequent attempts to add the comments will then fail with errors. Logs contain DiffNote::NoteDiffFileCreationError messages.

The issue occurs rarely (a few times per month) and is reproducible when encountered, but no discernible pattern was observable as to what conditions might trigger it. It can usually be worked around by commenting on slightly different lines.

Steps to reproduce

  1. Add comments to MR, either directly or in bulk via "Submit Review" feature
  2. See no comments being added
  3. Retry step 1
  4. See error message
  5. Observe DiffNote::NoteDiffFileCreationError in logs

What is the current bug behavior?

MR comments are sometimes not being added and lost to (silent) errors

What is the expected correct behavior?

MR comments are always correctly saved after submission

Relevant logs and/or screenshots

HAR of a repeated request

Expand full log 
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Excerpt from production_json.log

Note: The log below is NOT directly related to the above HAR, they are two separate occasions of the issue!

Expand full log 
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Additional logs

Zendesk 🎫 #286108 (internal) has several full SOS reports after reproducing the error.

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info 

System information
System:		Ubuntu 18.04
Proxy:		no
Current User:	git
Using RVM:	no
Ruby Version:	2.7.5p203
Gem Version:	3.1.4
Bundler Version:2.2.33
Rake Version:	13.0.6
Redis Version:	6.2.6
Sidekiq Version:6.4.0
Go Version:	unknown

GitLab information
Version:	15.0.1-ee
Revision:	d69f38d4a95
Directory:	/opt/gitlab/embedded/service/gitlab-rails
DB Adapter:	PostgreSQL
DB Version:	12.10
URL:		https://redacted.tld
HTTP Clone URL:	https://redacted.tld/some-group/some-project.git
SSH Clone URL:	git@redacted.tld:some-group/some-project.git
Elasticsearch:	yes
Geo:		no
Using LDAP:	yes
Using Omniauth:	yes
Omniauth Providers: azure_oauth2, github, bitbucket

GitLab Shell
Version:	14.3.0
Repository storage paths:
- default: 	/mnt/data/gitlab/git-data/repositories
GitLab Shell path:		/opt/gitlab/embedded/service/gitlab-shell

Results of GitLab application Check

Expand for output related to the GitLab application check 
Checking GitLab subtasks ...


Checking GitLab Shell ...


GitLab Shell: ... GitLab Shell version >= 14.3.0 ? ... OK (14.3.0)
Running /opt/gitlab/embedded/service/gitlab-shell/bin/check
Internal API available: OK
Redis available via internal API: OK
gitlab-shell self-check successful


Checking GitLab Shell ... Finished


Checking Gitaly ...


Gitaly: ... default ... OK


Checking Gitaly ... Finished


Checking Sidekiq ...


Sidekiq: ... Running? ... yes
Number of Sidekiq processes (cluster/worker) ... 1/3


Checking Sidekiq ... Finished


Checking Incoming Email ...


Incoming Email: ... Reply by email is disabled in config/gitlab.yml


Checking Incoming Email ... Finished


Checking LDAP ...


LDAP: ... Server: ldapmain
LDAP authentication... Success
LDAP users with access to your GitLab server (only showing the first 100 results)
User output sanitized. Found 100 users of 100 limit.


Checking LDAP ... Finished


Checking GitLab App ...


Database config exists? ... yes
All migrations up? ... yes
Database contains orphaned GroupMembers? ... no
GitLab config exists? ... yes
GitLab config up to date? ... yes
Log directory writable? ... yes
Tmp directory writable? ... yes
Uploads directory exists? ... yes
Uploads directory has correct permissions? ... yes
Uploads directory tmp has correct permissions? ... yes
Systemd unit files or init script exist? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Systemd unit files or init script up-to-date? ... skipped (omnibus-gitlab has neither init script nor systemd units)
Projects have namespace: ...
4/1 ... yes
9/3 ... yes
9/4 ... yes
9/5 ... yes
10/6 ... yes
6/7 ... yes
9/8 ... yes
9/9 ... yes
4/10 ... yes
9/11 ... yes
8/12 ... yes
4/13 ... yes
10/14 ... yes
8/15 ... yes
4/16 ... yes
14/18 ... yes
8/19 ... yes
10/20 ... yes
4/22 ... yes
8/26 ... yes
4/27 ... yes
16/29 ... yes
9/30 ... yes
16/32 ... yes
8/33 ... yes
4/34 ... yes
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4/36 ... yes
27/37 ... yes
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6/39 ... yes
32/40 ... yes
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9/111 ... yes
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123/120 ... yes
123/121 ... yes
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4/123 ... yes
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83/125 ... yes
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274/384 ... yes
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83/433 ... yes
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121/435 ... yes
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320/437 ... yes
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433/457 ... yes
108/458 ... yes
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234/460 ... yes
247/461 ... yes
247/462 ... yes
83/464 ... yes
237/465 ... yes
144/466 ... yes
237/467 ... yes
237/468 ... yes
83/469 ... yes
85/470 ... yes
247/471 ... yes
32/472 ... yes
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226/475 ... yes
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433/479 ... yes
83/480 ... yes
247/481 ... yes
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289/485 ... yes
247/486 ... yes
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121/493 ... yes
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247/517 ... yes
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348/522 ... yes
4/523 ... yes
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320/525 ... yes
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389/559 ... yes
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389/561 ... yes
25/562 ... yes
121/563 ... yes
83/564 ... yes
83/565 ... yes
27/566 ... yes
27/567 ... yes
9/568 ... yes
123/569 ... yes
121/570 ... yes
125/571 ... yes
89/572 ... yes
83/573 ... yes
83/574 ... yes
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85/582 ... yes
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410/588 ... yes
83/589 ... yes
83/590 ... yes
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433/593 ... yes
27/594 ... yes
85/595 ... yes
85/596 ... yes
4/597 ... yes
121/598 ... yes
234/599 ... yes
83/601 ... yes
121/602 ... yes
438/603 ... yes
343/604 ... yes
83/605 ... yes
234/606 ... yes
226/607 ... yes
237/608 ... yes
16/609 ... yes
83/610 ... yes
83/611 ... yes
9/612 ... yes
83/613 ... yes
449/614 ... yes
89/615 ... yes
123/616 ... yes
108/617 ... yes
123/618 ... yes
123/619 ... yes
89/620 ... yes
4/621 ... yes
228/622 ... yes
83/623 ... yes
83/624 ... yes
466/625 ... yes
83/626 ... yes
226/628 ... yes
237/629 ... yes
4/630 ... yes
472/631 ... yes
83/632 ... yes
410/633 ... yes
83/634 ... yes
83/635 ... yes
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105/637 ... yes
83/638 ... yes
83/639 ... yes
226/640 ... yes
83/641 ... yes
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83/643 ... yes
119/644 ... yes
83/645 ... yes
83/646 ... yes
61/647 ... yes
472/648 ... yes
83/649 ... yes
83/650 ... yes
83/651 ... yes
4/652 ... yes
469/653 ... yes
484/654 ... yes
119/655 ... yes
83/656 ... yes
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172/659 ... yes
83/660 ... yes
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83/663 ... yes
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119/665 ... yes
234/666 ... yes
83/667 ... yes
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83/670 ... yes
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83/675 ... yes
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105/677 ... yes
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123/687 ... yes
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530/702 ... yes
105/703 ... yes
234/704 ... yes
108/705 ... yes
83/706 ... yes
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576/710 ... yes
502/711 ... yes
26/712 ... yes
83/713 ... yes
83/714 ... yes
83/715 ... yes
83/716 ... yes
4/717 ... yes
4/718 ... yes
83/719 ... yes
83/720 ... yes
83/721 ... yes
105/722 ... yes
83/723 ... yes
257/724 ... yes
4/725 ... yes
234/726 ... yes
27/727 ... yes
83/728 ... yes
136/729 ... yes
136/730 ... yes
83/731 ... yes
105/732 ... yes
Redis version >= 5.0.0? ... yes
Ruby version >= 2.7.2 ? ... yes (2.7.5)
Git user has default SSH configuration? ... no
Try fixing it:
mkdir ~/gitlab-check-backup-1654516299
sudo mv /var/opt/gitlab/.ssh/known_hosts~ ~/gitlab-check-backup-1654516299
For more information see:
doc/user/ssh.md#overriding-ssh-settings-on-the-gitlab-server
Please fix the error above and rerun the checks.
Active users: ... 264
Is authorized keys file accessible? ... yes
GitLab configured to store new projects in hashed storage? ... yes
All projects are in hashed storage? ... yes
Elasticsearch version 7.x-8.x or OpenSearch version 1.x ... yes (elasticsearch 7.16.2)


Checking GitLab App ... Finished


Checking GitLab subtasks ... Finished

Related issues

There's two existing issues that mention DiffNote::NoteDiffFileCreationError:

However, they all seem to have some ghost notes as the underlying cause. The customer here used the Rails console to confirm there's no ghost notes present as described in the workaround to be found in the other issues. Also none of the conditions pointed out there (force pushes, project imports) as a cause for them do apply, so we're assuming this is a different problem.

Edited by Manuel Grabowski