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Some times the API tests fail and the only output a user gets is:

2020-08-31 14:57:01,212.212 INFO:__main__:Creating cluster with 1 MDS daemons
2020-08-31 14:57:01,212.212 INFO:__main__:
tearing down the cluster...
2020-08-31 14:57:01,212.212 INFO:__main__:Running ['../src/stop.sh']
2020-08-31 14:57:01,922.922 INFO:__main__:Running ['rm', '-rf', './dev', './out']
2020-08-31 14:57:01,929.929 INFO:__main__:Running ['../src/vstart.sh', '-n', '--nolockdep']
Build step 'Execute shell' marked build as failure
Setting status of 6440282a6c01fd79ddc90bda6383e47da2137b3e to FAILURE with url https://jenkins.ceph.com/job/ceph-api/2088/ and message: 'ceph API tests failed
 '
Using context: ceph API tests
Finished: FAILURE

That's because daemon logs are only dumped when the tests have already started, but if the error happens during the start up stage, no feedback is provided.