Intermittent 500 Error When Searching Merge Requests

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Summary

• A customer reported encountering 500 errors when searching Merge Requests on GitLab.com
• In their tests, the issue only seems to occur when their search term has 3 or more words e.g. "company logo upload" vs "company logo"
• This doesn't affect all users, so it's hard to reproduce, but Sentry has an error log
• Kibana and Sentry show that some users are experiencing this intermittently
• Sentry error - https://new-sentry.gitlab.net/organizations/gitlab/issues/666886/

Steps to reproduce

1. Go to Merge requests on a project
2. Search for text in the title of one of the MRs, make sure your search string incudes a minimum of 3 words

Example Project

What is the current bug behavior?

A 500 Error gets thrown

What is the expected correct behavior?

1. Results matching the search term get displayed OR
2. A message is displayed indicating that the filter produced no results

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

Customers

Customers

customer	contact
https://gitlab.zendesk.com/agent/tickets/513023	@lalabi