While checking some logs on openQA, trying to find why so many tests are
failing, I stumbled over a segfault of snapper:

Jun 07 02:18:14 susetest org.opensuse.Snapper[719]: terminate called after
throwing an instance of
'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::lock_error>
>'
Jun 07 02:18:14 susetest org.opensuse.Snapper[719]:   what():  boost: mutex
lock failed in pthread_mutex_lock: Invalid argument
Jun 07 02:18:14 susetest systemd[1]: Started Process Core Dump (PID 20684/UID
0).
Jun 07 02:18:15 susetest systemd-coredump[20685]: Process 18707 (snapperd) of
user 0 dumped core.

TIME                            PID   UID   GID SIG COREFILE  EXE
Thu 2018-06-07 02:09:35 EDT    2722     0     0   6 present   /bin/login
Thu 2018-06-07 02:14:34 EDT   14648     0     0   6 present  
/usr/sbin/snapperd
Thu 2018-06-07 02:15:58 EDT   16462     0     0   6 present  
/usr/sbin/snapperd
Thu 2018-06-07 02:18:15 EDT   18707     0     0   6 present  
/usr/sbin/snapperd

This can explain why openQA has a hard time passing the tests, as the system is
pre-occupied writing coredumps

The three snaperd coredumps are available in the openQA provided tarball

https://openqa.opensuse.org/tests/688332/file/gimp-problem_detection_logs.tar.xz

(directory coredumps)