Ceph » CephFS

http://qa-proxy.ceph.com/teuthology/teuthology-2014-04-22_23:05:45-kcephfs-firefly-testing-basic-plana/210650/
http://qa-proxy.ceph.com/teuthology/teuthology-2014-04-21_23:04:41-kcephfs-master-testing-basic-plana/208182/

We're seeing this pop up repeatedly, but unfortunately there's not much I can find to diagnose it with.

From one of them, for instance:
The bits of the teuthology log before the failure:
2014-04-23T17:39:02.247 INFO:teuthology.task.workunit.client.0.err:[10.214.131.19]: + mkdir layout_test
2014-04-23T17:39:02.248 INFO:teuthology.task.workunit.client.0.err:[10.214.131.19]: + cephfs layout_test show_layout
2014-04-23T17:39:02.250 INFO:teuthology.task.workunit.client.0.err:[10.214.131.19]: layout not specified
2014-04-23T17:39:02.250 INFO:teuthology.task.workunit.client.0.err:[10.214.131.19]: + cephfs layout_test set_layout -u 1048576 -c 1 -s 1048576
2014-04-23T17:54:45.113 INFO:teuthology.task.workunit:Stopping kclient on client.0...
2014-04-23T17:54:45.113 ERROR:teuthology.parallel:Exception in parallel execution

Note the 15 minute interval for no apparent reason...there are no logs
from the userspace daemons and no core dumps, nor anything in the
syslog of interest. misc.log contains:

2014-04-23T17:39:34.756180-07:00 plana57 sudo: pam_unix(sudo:session): session opened for user root by (uid=107)
2014-04-23T17:39:34.854410-07:00 plana57 sudo: pam_unix(sudo:session): session closed for user root
2014-04-23T17:43:05.125536-07:00 plana57 sshd¹³⁴⁴⁸: Connection closed by 10.214.140.231 [preauth]
2014-04-23T17:45:01.493618-07:00 plana57 CRON¹³⁴⁵⁰: pam_unix(cron:session): session opened for user root by (uid=0)
2014-04-23T17:45:01.494047-07:00 plana57 CRON¹³⁴⁵¹: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)