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09:17:45.000000000","tz":120},"committer":{"name":"Eric Harney","email":"eharney@redhat.com","date":"2022-09-21 20:57:58.000000000","tz":-240},"subject":"Tests: Fix test runner never finishing","message":"Tests: Fix test runner never finishing\n\nThe tpool.killall method seems to block in some cases when running unit\ntests, as observed with the Guru Meditation Reports. This has been\nhappening primarily on Python 3.9 and 3.10.\n\nMoving the call from the test setUp to the cleanup after stopping\nexisting looping calls seems to resolve the issue.  At least we\u0027ve been\nunable to reproduce the issue again even when running tests with\n\u0027--random\u0027.\n\nWe need a way to identify existing looping calls that must be stopped,\ntracking them with a decorator on the LoopingCallBase class __init__\nmethod or looking for its instances in the objects tracked by the\nGarbage Collector.\n\nUsing the GC mechanisms makes tests take 12 times longer to complete, so\nthis patch creates a new test utils class called InstanceTracker that\nallows tracking any class.\n\nWe haven\u0027t been able to reproduce the test runner freeze situation with\nthis patch, even when running tests with \u0027--random\u0027, but just in case\nthis happens again a TPOOL_KILLALL_ISSUE flag has been created to allow\neasily disabling things if this were to happen again.\n\nBecause the tests use greenthreads, debugging blocked tests with GDB is\na nightmare, so the patch also adds the Guru Meditation Reports feature\nto the test runner, that way we can do:\n\n $ kill -USR2 \u003cchild_runner_pid\u003e\n\nAnd see the greenthreads, where in this case we would see one of them\nstuck in the tpool.killall() call.\n\nChange-Id: Idb5c428adcc1112046cc81a441c572a2e6bfa80c\n(cherry picked from commit eb8409b3a8af41e2203e3b84bc6f02167ceef6a4)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/ba15a23b71dd7c6a964434f5180eb54af26aff50"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/ba15a23b71dd7c6a964434f5180eb54af26aff50"}]},"branch":"refs/heads/stable/yoga"}},"requirements":[],"submit_records":[{"rule_name":"gerrit~DefaultSubmitRule","status":"CLOSED","labels":[{"label":"Verified","status":"OK","applied_by":{"_account_id":22348,"name":"Zuul","username":"zuul","tags":["SERVICE_USER"]}},{"label":"Code-Review","status":"OK","applied_by":{"_account_id":11904,"name":"Sean McGinnis","email":"sean.mcginnis@gmail.com","username":"SeanM"}},{"label":"Workflow","status":"OK","applied_by":{"_account_id":11904,"name":"Sean McGinnis","email":"sean.mcginnis@gmail.com","username":"SeanM"}},{"label":"Review-Priority","status":"MAY"}]}],"submit_requirements":[]}