[jira] [Created] (MESOS-4711) Race condition in libevent poll implementation causes crash

["Alexander Rojas (JIRA)" <ji...@apache.org>]

Alexander Rojas created MESOS-4711:
--------------------------------------

             Summary: Race condition in libevent poll implementation causes crash
                 Key: MESOS-4711
                 URL: https://issues.apache.org/jira/browse/MESOS-4711
             Project: Mesos
          Issue Type: Bug
          Components: libprocess
    Affects Versions: 0.28.0
         Environment: CentOS 6.7 running in VirtualBox
            Reporter: Alexander Rojas


The issue first arose in MESOS-3271, but can be reproduced every time by using the mentioned environment and running:

{noformat}
sudo ./bin/mesos-tests.sh --gtest_filter="MemoryPressureMesosTest.CGROUPS_ROOT_SlaveRecovery" --gtest_repeat=1000
{noformat}

The problem can be traced back to [{{libevent_poll.cpp}}|https://github.com/apache/mesos/blob/3539b7a0e15b594148308319bf052d28b1429b98/3rdparty/libprocess/src/libevent_poll.cpp]. If the event is triggered and the the future associated with the event is discarded, the situation arises in which  [{{pollCallback()}}|https://github.com/apache/mesos/blob/3539b7a0e15b594148308319bf052d28b1429b98/3rdparty/libprocess/src/libevent_poll.cpp#L33] starts executing just early enough to finish before [{{pollDiscard()}}|https://github.com/apache/mesos/blob/3539b7a0e15b594148308319bf052d28b1429b98/3rdparty/libprocess/src/libevent_poll.cpp#L53] executes. If that happens, {{pollCallback()}} deletes the poll object and {{pollDiscard()}} is left with a dangling pointer which crashes when it executes the line {{event_active(ev, EV_READ, 0);}}.



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