<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=25393) </details> <!--IssueSummary end--> Hello, I just update my GitLab instance to v11.5-stable following the instructions https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/update/11.4-to-11.5.md The problem is that sidekiq crashing very ofter and I need to restart gitlab instance, because the background jobs stop working.. This is logs entries from /home/git/gitlab/log/sidekiq.log 2018-11-23T16:00:58.031Z 8491 TID-gtkyilbqz ProcessCommitWorker JID-d76b4d88e5736eaf359d20be INFO: done: 0.061 sec re2/re2.cc:194: Error parsing '(\)': missing ): (\) terminate called after throwing an instance of 'std::bad_alloc' what(): std::bad_alloc 2018-11-23T15:30:35.064Z 2546 TID-gr73qv4fe UpdateMergeRequestsWorker JID-c23269c4361a99a72aa27392 INFO: done: 0.081 sec re2/re2.cc:194: Error parsing '(\)': missing ): (\) terminate called after throwing an instance of 'std::bad_alloc' what(): std::bad_alloc