Hi all,

Several teuthology jobs fail with the error 'exception on parallel execution' 
in my testing. I don't see any failures/errors/assertions in the mon/osd logs. 
And these failed jobs always have 'sentry event' log. However, I'm not able to 
open the sentry link.

Here is an example:
http://pulpito.ceph.com/yuan-2015-06-02_20:18:44-rados-wip-proxy-write---basic-multi/918584/
Log: 
http://qa-proxy.ceph.com/teuthology/yuan-2015-06-02_20:18:44-rados-wip-proxy-write---basic-multi/918584/teuthology.log
Sentry event: 
http://sentry.ceph.com/sepia/teuthology/search?q=38a00a22270748e79e8f0dd69a624ab4

2015-06-02T20:27:18.149 ERROR:teuthology.parallel:Exception in parallel 
execution
Traceback (most recent call last):
  File "/home/teuthworker/src/teuthology_master/teuthology/parallel.py", line 
82, in __exit__
    for result in self:
  File "/home/teuthworker/src/teuthology_master/teuthology/parallel.py", line 
101, in next
    resurrect_traceback(result)
  File "/home/teuthworker/src/teuthology_master/teuthology/parallel.py", line 
19, in capture_traceback
    return func(*args, **kwargs)
  File "/var/lib/teuthworker/src/ceph-qa-suite_master/tasks/workunit.py", line 
361, in _run_tests
    label="workunit test {workunit}".format(workunit=workunit)
  File 
"/home/teuthworker/src/teuthology_master/teuthology/orchestra/remote.py", line 
156, in run
    r = self._runner(client=self.ssh, name=self.shortname, **kwargs)
  File "/home/teuthworker/src/teuthology_master/teuthology/orchestra/run.py", 
line 378, in run
    r.wait()
  File "/home/teuthworker/src/teuthology_master/teuthology/orchestra/run.py", 
line 114, in wait
    label=self.label)
CommandFailedError: Command failed (workunit test cephtool/test.sh) on plana52 
with status 1: 'mkdir -p -- /home/ubuntu/cephtest/mnt.0/client.0/tmp && cd -- 
/home/ubuntu/cephtest/mnt.0/client.0/tmp && CEPH_CLI_TEST_DUP_COMMAND=1 
CEPH_REF=d5a52869dd23ae1fbdf3e80d54e855560e467ff6 
TESTDIR="/home/ubuntu/cephtest" CEPH_ID="0" PATH=$PATH:/usr/sbin adjust-ulimits 
ceph-coverage /home/ubuntu/cephtest/archive/coverage timeout 3h 
/home/ubuntu/cephtest/workunit.client.0/cephtool/test.sh'
2015-06-02T20:27:18.150 ERROR:teuthology.run_tasks:Saw exception from tasks.

Is this something wrong with the teuthology itself? Anyone has experience with 
this? Any hints are welcomed~
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