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haosdent commented on MESOS-3349: --------------------------------- [~jieyu] I try that on Ubuntu 14.04 (3.13.0-32) and CentOS 6 (2.6.32-504) And sure why umount success and rmdir failed is because executor is still running and holding the mount point after I add trace code in executor.cpp. This is also the reason why we could rmdir success after few seconds. Because executor would terminated in few seconds after send TASK_FINISH. We could reproduce this problem through these simple shell snippet {code} mkdir /tmp/source /tmp/target mount --bind /tmp/source /tmp/target unshare -m /bin/bash -- -c "sleep 2" & umount /tmp/target && rmdir /tmp/target {code} And this test case also simulate this problem: https://reviews.apache.org/r/38300/diff/1#index_header > PersistentVolumeTest.AccessPersistentVolume fails when run as root. > ------------------------------------------------------------------- > > Key: MESOS-3349 > URL: https://issues.apache.org/jira/browse/MESOS-3349 > Project: Mesos > Issue Type: Bug > Components: test > Environment: Ubuntu 14.04, CentOS 5 > Reporter: Benjamin Mahler > Assignee: haosdent > Labels: flaky-test > > When running the tests as root: > {noformat} > [ RUN ] PersistentVolumeTest.AccessPersistentVolume > I0901 02:17:26.435140 39432 exec.cpp:133] Version: 0.25.0 > I0901 02:17:26.442129 39461 exec.cpp:207] Executor registered on slave > 20150901-021726-1828659978-52102-32604-S0 > Registered executor on hostname > Starting task d8ff1f00-e720-4a61-b440-e111009dfdc3 > sh -c 'echo abc > path1/file' > Forked command at 39484 > Command exited with status 0 (pid: 39484) > ../../src/tests/persistent_volume_tests.cpp:579: Failure > Value of: os::exists(path::join(directory, "path1")) > Actual: true > Expected: false > [ FAILED ] PersistentVolumeTest.AccessPersistentVolume (777 ms) > {noformat} > FYI [~jieyu] [~mcypark] -- This message was sent by Atlassian JIRA (v6.3.4#6332)