Something strange happening with zuul-merger on contint2001.
Superficially similar to T283665: Unable to fix "This change or one of its cross-repo dependencies was unable to be automatically merged with the current state of its repository. Please rebase the change and upload a new patchset."
Was seeing
2023-04-10 18:41:48,390 DEBUG zuul.Merger: Unable to merge {u'oldrev': None, u'newrev': None, u'refspec': u'refs/changes/78/779578/6', u'merge_mode': 2, u'connection_name': u'gerrit', u'number': u'779578', u'proj
ect': u'labs/tools/graphql', u'url': u'ssh://jenkins-bot@gerrit.wikimedia.org:29418/labs/tools/graphql', u'branch': u'master', u'patchset': 6, u'ref': u'Z6c755d76c9dd4aa683cb2f3973781553'}
Traceback (most recent call last):
File "/srv/deployment/zuul/venv/local/lib/python2.7/site-packages/zuul/merger/merger.py", line 277, in _mergeChange
commit = repo.merge(item['refspec'], 'resolve')
File "/srv/deployment/zuul/venv/local/lib/python2.7/site-packages/zuul/merger/merger.py", line 163, in merge
self.fetch(ref)
File "/srv/deployment/zuul/venv/local/lib/python2.7/site-packages/zuul/merger/merger.py", line 176, in fetch
origin.fetch(ref)
File "/srv/deployment/zuul/venv/local/lib/python2.7/site-packages/git/remote.py", line 789, in fetch
res = self._get_fetch_info_from_stderr(proc, progress)
File "/srv/deployment/zuul/venv/local/lib/python2.7/site-packages/git/remote.py", line 675, in _get_fetch_info_from_stderr
proc.wait(stderr=stderr_text)
File "/srv/deployment/zuul/venv/local/lib/python2.7/site-packages/git/cmd.py", line 415, in wait
raise GitCommandError(self.args, status, errstr)
GitCommandError: Cmd('git') failed due to: exit code(128)
cmdline: git fetch -v origin refs/changes/78/779578/6
stderr: 'fatal: Could not read from remote repositoryBut a manual git fetch worked as the zuul user sudo -u zuul git fetch -v
Restarted zuul-merger and it's still not working, but also now NOT raising an error in /var/log/zuul/merger-debug.log