Undefined Error creating pipeline
Earlier today, this happened in !724 (merged) (see the "Pipelines" tab). We've seen it also in at least one of the pipelines between upstream 16.9 and 16.10.
It turns out in this case it is the known slowness / susceptibility to worker starvation of HGitaly in the MercurialListChangesets
call:
"exception.backtrace": [
"lib/gitlab/git/wraps_gitaly_errors.rb:20:in `rescue in wrapped_gitaly_errors'",
"lib/gitlab/git/wraps_gitaly_errors.rb:6:in `wrapped_gitaly_errors'",
"lib/gitlab/mercurial/hg_git_repository.rb:360:in `hg_changeset_branch_topic'",
"lib/gitlab/ci/variables/builder/pipeline.rb:91:in `hg_append_predefined_commit_variables'",
Should be solved by hgitaly#179