dnfdragora-updater repeatedly dies with this

gistfile1.txt

#2  0x00007f18ca30e769 in __assert_fail_base (fmt=0x7f18c55ca6eb <error: Cannot access memory at address 0x7f18c55ca6eb>, 
    assertion=0x7f18c8eaf800 "!xcb_xlib_threads_sequence_lost", file=0x7f18c8eaf673 "xcb_io.c", line=263, function=<optimized out>) at assert.c:92
#3  0x00007f18ca31c566 in __GI___assert_fail (assertion=assertion@entry=0x7f18c8eaf800 "!xcb_xlib_threads_sequence_lost", file=file@entry=0x7f18c8eaf673 "xcb_io.c", 
    line=line@entry=263, function=function@entry=0x7f18c8eafab0 <__PRETTY_FUNCTION__.14998> "poll_for_event") at assert.c:101
#4  0x00007f18c8e3c8db in poll_for_event (dpy=dpy@entry=0x55f92b80f4c0, queued_only=queued_only@entry=0) at xcb_io.c:260
#5  0x00007f18c8e3c980 in poll_for_response (dpy=dpy@entry=0x55f92b80f4c0) at xcb_io.c:303
#6  0x00007f18c8e3cc85 in _XEventsQueued (dpy=dpy@entry=0x55f92b80f4c0, mode=mode@entry=2) at xcb_io.c:363
#7  0x00007f18c8e2e727 in XPending (dpy=0x55f92b80f4c0) at Pending.c:55
#8  0x00007f18bfed5103 in gdk_check_xpending (display=<optimized out>) at gdkeventsource.c:269
#9  gdk_event_source_check (source=0x55f92b830c60) at gdkeventsource.c:306
#10 0x00007f18c9791c21 in g_main_context_check (context=context@entry=0x55f92b43ddb0, max_priority=2147483647, fds=fds@entry=0x55f92ba35dd0, n_fds=n_fds@entry=4)
    at ../glib/gmain.c:3760
#11 0x00007f18c9792172 in g_main_context_iterate (context=0x55f92b43ddb0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:3924
#12 0x00007f18c9792593 in g_main_loop_run (loop=0x7f18b40199e0) at ../glib/gmain.c:4123
#13 0x00007f18c96a7b28 in ffi_call_unix64 () at ../src/x86/unix64.S:76
#14 0x00007f18c96a7339 in ffi_call (cif=cif@entry=0x7f18b401d098, fn=<optimized out>, rvalue=<optimized out>, rvalue@entry=0x7f18bede0578, avalue=<optimized out>)
    at ../src/x86/ffi64.c:525
#15 0x00007f18c9896bd5 in pygi_invoke_c_callable (function_cache=0x7f18b401cff0, state=<optimized out>, py_args=<optimized out>, py_kwargs=<optimized out>)
    at ../gi/pygi-invoke.c:690
#16 0x00007f18c989870c in pygi_function_cache_invoke (function_cache=<optimized out>, py_args=py_args@entry=(<MainLoop at remote 0x7f18bee02b40>,), 
    py_kwargs=py_kwargs@entry=0x0) at ../gi/pygi-cache.c:863
#17 0x00007f18c9897329 in pygi_callable_info_invoke (user_data=0x0, cache=<optimized out>, kwargs=0x0, py_args=(<MainLoop at remote 0x7f18bee02b40>,), 
    info=<optimized out>) at ../gi/pygi-invoke.c:770
#18 _wrap_g_callable_info_invoke (self=<optimized out>, py_args=py_args@entry=<unknown at remote 0x541bf04c08386600>, kwargs=kwargs@entry=0x0) at ../gi/pygi-invoke.c:770
#19 0x00007f18c98892bb in _callable_info_call (kwargs=0x0, args=(), self=0x7f18bee18ab0) at ../gi/pygi-info.c:556
#20 _callable_info_call (self=0x7f18bee18ab0, args=(), kwargs=0x0) at ../gi/pygi-info.c:533
#21 0x00007f18ca0da56c in _PyObject_FastCallKeywords (callable=<gi.FunctionInfo at remote 0x7f18bee18ab0>, stack=<optimized out>, nargs=<optimized out>, 
    kwnames=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:203
#22 0x00007f18ca0db829 in call_function (pp_stack=0x7f18bede07b0, oparg=<optimized out>, kwnames=0x0) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:4619
#23 0x00007f18ca117a02 in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3093
#24 0x00007f18ca0c9080 in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, 
    kwnames=0x0, kwargs=0x7f18bee1b200, kwcount=<optimized out>, kwstep=1, defs=0x0, defcount=0, kwdefs=0x0, closure=(<cell at remote 0x7f18c8c259d0>,), name='run', 
    qualname='MainLoop.run') at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3930
#25 0x00007f18ca0ca082 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=0x7f18bee1b1f8, nargs=1, kwnames=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:433
#26 0x00007f18ca0db69f in call_function (pp_stack=0x7f18bede0a90, oparg=<optimized out>, kwnames=0x0) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:4616
#27 0x00007f18ca11306d in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3110
#28 0x00007f18ca0c9080 in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, 
    kwnames=0x0, kwargs=0x7f18bee15f28, kwcount=<optimized out>, kwstep=1, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name='_run_dbus_async', 
    qualname='DnfDaemonBase._run_dbus_async') at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3930
#29 0x00007f18ca0ca082 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=0x7f18bee15f00, nargs=5, kwnames=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:433
#30 0x00007f18ca0db69f in call_function (pp_stack=0x7f18bede0d70, oparg=<optimized out>, kwnames=0x0) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:4616
#31 0x00007f18ca11306d in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3110
#32 0x00007f18ca0c9080 in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, 
    kwnames=0x0, kwargs=0x7f18b4001390, kwcount=<optimized out>, kwstep=1, defs=0x7f18c8bc89a8, defcount=1, kwdefs=0x0, closure=0x0, name='GetPackages', 
    qualname='DnfDaemonBase.GetPackages') at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3930
#33 0x00007f18ca0ca082 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=0x7f18b4001380, nargs=2, kwnames=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:433
#34 0x00007f18ca0db69f in call_function (pp_stack=0x7f18bede1050, oparg=<optimized out>, kwnames=0x0) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:4616
#35 0x00007f18ca11306d in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3110
#36 0x00007f18ca0c9080 in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, 
    kwnames=0x0, kwargs=0x7f18bede6560, kwcount=<optimized out>, kwstep=1, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name='__get_updates_func', 
    qualname='Updater.__get_updates_func') at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3930
#37 0x00007f18ca0ca082 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=0x7f18bede6550, nargs=2, kwnames=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:433
#38 0x00007f18ca0db69f in call_function (pp_stack=0x7f18bede1330, oparg=<optimized out>, kwnames=0x0) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:4616
#39 0x00007f18ca11306d in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3110
#40 0x00007f18ca0c9080 in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=<optimized out>, 
    kwnames=0x0, kwargs=0x7f18bede61d0, kwcount=<optimized out>, kwstep=1, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name='__get_updates', 
    qualname='Updater.__get_updates') at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3930
#41 0x00007f18ca0ca082 in _PyFunction_FastCallKeywords (func=<optimized out>, stack=0x7f18bede61c8, nargs=1, kwnames=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:433
#42 0x00007f18ca0db69f in call_function (pp_stack=0x7f18bede1610, oparg=<optimized out>, kwnames=0x0) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:4616
#43 0x00007f18ca11306d in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3110
#44 0x00007f18ca0ca54a in function_code_fastcall (globals=<optimized out>, nargs=1, args=<optimized out>, co=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:322
#45 _PyFunction_FastCallDict (func=<optimized out>, args=0x7f18bede1770, nargs=1, kwargs=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:322
#46 0x00007f18ca09e9c6 in _PyObject_Call_Prepend (callable=<function at remote 0x7f18befdce60>, obj=<optimized out>, args=(), kwargs={})
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:908
#47 0x00007f18ca0cac5e in PyObject_Call (callable=<method at remote 0x7f18c9c01f50>, args=<optimized out>, kwargs=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:245
#48 0x00007f18ca114779 in do_call_core (kwdict={}, callargs=(), func=<method at remote 0x7f18c9c01f50>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:4645
#49 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3191
#50 0x00007f18ca0c9ee2 in function_code_fastcall (globals=<optimized out>, nargs=1, args=<optimized out>, co=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:408
#51 _PyFunction_FastCallKeywords (func=<optimized out>, stack=0x7f18b4000cd0, nargs=1, kwnames=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:408
#52 0x00007f18ca0db69f in call_function (pp_stack=0x7f18bede1aa0, oparg=<optimized out>, kwnames=0x0) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:4616
#53 0x00007f18ca11306d in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3110
#54 0x00007f18ca0c9ee2 in function_code_fastcall (globals=<optimized out>, nargs=1, args=<optimized out>, co=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:408
#55 _PyFunction_FastCallKeywords (func=<optimized out>, stack=0x7f18beea8ca8, nargs=1, kwnames=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:408
#56 0x00007f18ca0db69f in call_function (pp_stack=0x7f18bede1c90, oparg=<optimized out>, kwnames=0x0) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:4616
#57 0x00007f18ca11306d in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/ceval.c:3110
#58 0x00007f18ca0ca54a in function_code_fastcall (globals=<optimized out>, nargs=1, args=<optimized out>, co=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:322
#59 _PyFunction_FastCallDict (func=<optimized out>, args=0x7f18bede1df0, nargs=1, kwargs=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:322
#60 0x00007f18ca09e9c6 in _PyObject_Call_Prepend (callable=<function at remote 0x7f18c9930f80>, obj=<optimized out>, args=(), kwargs=0x0)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:908
#61 0x00007f18ca0cac5e in PyObject_Call (callable=<method at remote 0x7f18c99a3eb0>, args=<optimized out>, kwargs=<optimized out>)
    at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Objects/call.c:245
#62 0x00007f18ca1a8e36 in t_bootstrap (boot_raw=boot_raw@entry=0x7f18beeadea0) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Modules/_threadmodule.c:994
#63 0x00007f18ca1233a4 in pythread_wrapper (arg=<optimized out>) at /usr/src/debug/python3-3.7.4-1.fc30.x86_64/Python/thread_pthread.h:174
#64 0x00007f18c9f8a4c0 in start_thread (arg=<optimized out>) at pthread_create.c:479
#65 0x00007f18ca3e8553 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb)