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Backtrace is:

"""
:analyze.py:307:prune:ValueError: list modified during sort
:
:Traceback (most recent call last):
:  File "/usr/lib64/python2.6/atexit.py", line 24, in _run_exitfuncs
:    func(*targs, **kargs)
:  File "/usr/lib64/python2.6/site-packages/setroubleshoot/server.py", line 547, in goodbye
:    database.save()
:  File "/usr/lib64/python2.6/site-packages/setroubleshoot/analyze.py", line 377, in save
:    self.prune()
:  File "/usr/lib64/python2.6/site-packages/setroubleshoot/analyze.py", line 307, in prune
:    self.sigs.signature_list.sort(lambda a,b: cmp(a.last_seen_date, b.last_seen_date))
:ValueError: list modified during sort
:
:Local variables in innermost frame:
:self: <setroubleshoot.analyze.SETroubleshootDatabase object at 0x1042b10>
"""

  My guess is that it is receiving a SIGHUP during exit,
causing the list to be reset.

  I found one extra similar report, but never resolved, at:
https://bugzilla.redhat.com/show_bug.cgi?id=1069203
[[abrt] setroubleshoot-server: analyze.py:283:prune:ValueError: list modified during sort]

  Unless I am missing some other condition where the list may
change during sort, I believe the fix is likely to block SIGHUP
during exit, as there is no point in rereading config files if
exiting.

This bug is reported on Red Hat Enterprise Linux 6 but it seems to be a problem of Red Hat Enterprise Linux 7. There's already a similar bug for this - https://bugzilla.redhat.com/show_bug.cgi?id=1315241 - lets move the discussion there.