SendBlob: get blob size: open /dev/null: permission denied
https://sentry.gitlap.com/gitlab/gitlab-workhorse-gitlabcom/issues/21592/
This is a semi-regular error now on gitlab.com. The frequency is not alarmingly high but it is peculiar.
The error is generated here: https://gitlab.com/gitlab-org/gitlab-workhorse/blob/master/internal/git/blob.go#L28
Randomly clicking occurrences on Sentry, it looks like they all stem from /api/v3/projects/:namespace/:project/repository/blobs/:sha1
. That is suspicious. This might be a problem in rails, not workhorse.