Created attachment 635640 [details]
backtrace

when trying to start virt-manager, following segfault occured:
(gdb) bt
#0  _gtk_settings_get_style_cascade (settings=0x0, scale=scale@entry=1) at
gtksettings.c:1755
#1  0x00007ff1cacd3050 in gtk_style_context_init (style_context=0x284e200) at
gtkstylecontext.c:425
#2  0x00007ff1d62fb0eb in g_type_create_instance (type=<optimized out>) at
gtype.c:1870
#3  0x00007ff1d62e005d in g_object_new_internal (class=class@entry=0x2830cd0,
params=params@entry=0x0, n_params=n_params@entry=0) at gobject.c:1774
#4  0x00007ff1d62e1b6d in g_object_newv
(object_type=object_type@entry=42012992, n_parameters=n_parameters@entry=0,
parameters=parameters@entry=0x0) at gobject.c:1921
#5  0x00007ff1d62e231c in g_object_new (object_type=42012992,
first_property_name=first_property_name@entry=0x0) at gobject.c:1614
#6  0x00007ff1cacd05f9 in gtk_style_context_new () at gtkstylecontext.c:994
#7  0x00007ff1caaff89f in _gtk_style_new_for_path (screen=0x0,
path=path@entry=0x2866230) at deprecated/gtkstyle.c:853
#8  0x00007ff1caaff91e in gtk_style_new () at deprecated/gtkstyle.c:887
#9  0x00007ff1cab024d9 in gtk_widget_get_default_style () at
deprecated/gtkstyle.c:4057
#10 0x00007ff1cad6aac5 in gtk_widget_init (widget=<optimized out>) at
gtkwidget.c:4510
#11 0x00007ff1d62fb0a8 in g_type_create_instance (type=<optimized out>) at
gtype.c:1864
#12 0x00007ff1d62e005d in g_object_new_internal (class=class@entry=0x285a800,
params=params@entry=0x0, n_params=n_params@entry=0) at gobject.c:1774
#13 0x00007ff1d62e1b6d in g_object_newv (object_type=41816864,
n_parameters=n_parameters@entry=0, parameters=parameters@entry=0x0) at
gobject.c:1921
#14 0x00007ff1d67631e5 in pygobject_constructv (self=self@entry=0x7ff1cb671230,
n_parameters=0, parameters=0x0) at gobjectmodule.c:986
#15 0x00007ff1d676a4d1 in pygobject_init (self=0x7ff1cb671230, args=<optimized
out>, kwargs=0x7ff1cb41be88) at pygobject.c:1276
#16 0x00007ff1d8cdd978 in wrap_init (self=<optimized out>, args=<optimized
out>, wrapped=<optimized out>, kwds=<optimized out>) at
Objects/typeobject.c:4748
#17 0x00007ff1d8d1e086 in PyObject_Call (func=func@entry=0x7ff1cb6e3d90,
arg=arg@entry=0x7ff1d91e2050, kw=<optimized out>) at Objects/abstract.c:2529
#18 0x00007ff1d8d37673 in PyEval_CallObjectWithKeywords
(func=func@entry=0x7ff1cb6e3d90, arg=arg@entry=0x7ff1d91e2050,
kw=kw@entry=0x7ff1cb41be88) at Python/ceval.c:3902
#19 0x00007ff1d8cc3444 in wrapperdescr_call (descr=descr@entry=0x7ff1d6a61e10,
args=0x7ff1d91e2050, args@entry=0x7ff1d4d13750, kwds=kwds@entry=0x7ff1cb41be88)
at Objects/descrobject.c:343
#20 0x00007ff1d8d1e086 in PyObject_Call (func=func@entry=0x7ff1d6a61e10,
arg=arg@entry=0x7ff1d4d13750, kw=kw@entry=0x7ff1cb41be88) at
Objects/abstract.c:2529
#21 0x00007ff1d8d39cd8 in ext_do_call (nk=<optimized out>, na=<optimized out>,
flags=<optimized out>, pp_stack=0x7ffd46ba1a80, func=0x7ff1d6a61e10) at
Python/ceval.c:4346
#22 PyEval_EvalFrameEx (f=f@entry=0x27ae050, throwflag=throwflag@entry=0) at
Python/ceval.c:2718
#23 0x00007ff1d8d3ec3e in PyEval_EvalCodeEx (co=0x7ff1d4d56130,
globals=<optimized out>, locals=locals@entry=0x0,
args=args@entry=0x7ff1d6ed7b68, argcount=<optimized out>, kws=kws@entry=0x0,
kwcount=kwcount@entry=0, 
    defs=defs@entry=0x0, defcount=defcount@entry=0,
closure=closure@entry=0x7ff1cb42eec0) at Python/ceval.c:3265
#24 0x00007ff1d8d22c2f in function_call (func=func@entry=0x7ff1c3a448c0,
arg=arg@entry=0x7ff1d6ed7b50, kw=kw@entry=0x0) at Objects/funcobject.c:526
#25 0x00007ff1d8d1e086 in PyObject_Call (func=func@entry=0x7ff1c3a448c0,
arg=arg@entry=0x7ff1d6ed7b50, kw=kw@entry=0x0) at Objects/abstract.c:2529
#26 0x00007ff1d8d1ef7a in instancemethod_call (func=0x7ff1c3a448c0,
func@entry=0x7ff1cb671140, arg=0x7ff1d6ed7b50, arg@entry=0x7ff1d91e2050,
kw=kw@entry=0x0) at Objects/classobject.c:2602
#27 0x00007ff1d8d1e086 in PyObject_Call (func=func@entry=0x7ff1cb671140,
arg=arg@entry=0x7ff1d91e2050, kw=kw@entry=0x0) at Objects/abstract.c:2529
#28 0x00007ff1d8d2f1e9 in slot_tp_init (self=self@entry=0x7ff1cb671230,
args=args@entry=0x7ff1d91e2050, kwds=kwds@entry=0x0) at
Objects/typeobject.c:5692
#29 0x00007ff1d8d2e81a in type_call (type=<optimized out>,
type@entry=0x27e23a0, args=args@entry=0x7ff1d91e2050, kwds=kwds@entry=0x0) at
Objects/typeobject.c:745
#30 0x00007ff1d8d1e086 in PyObject_Call (func=func@entry=0x27e23a0,
arg=arg@entry=0x7ff1d91e2050, kw=kw@entry=0x0) at Objects/abstract.c:2529
#31 0x00007ff1d8d38f60 in do_call (nk=<optimized out>, na=<optimized out>,
pp_stack=0x7ffd46ba2080, func=<optimized out>) at Python/ceval.c:4251
#32 call_function (oparg=<optimized out>, pp_stack=0x7ffd46ba2080) at
Python/ceval.c:4056
#33 PyEval_EvalFrameEx (f=f@entry=0x275f040, throwflag=throwflag@entry=0) at
Python/ceval.c:2679
#34 0x00007ff1d8d3ec3e in PyEval_EvalCodeEx (co=0x7ff1d90c2a30,
globals=<optimized out>, locals=locals@entry=0x0, args=<optimized out>,
argcount=argcount@entry=0, kws=<optimized out>, kwcount=0, defs=0x0,
defcount=0, closure=0x0)
    at Python/ceval.c:3265
#35 0x00007ff1d8d3886b in fast_function (nk=<optimized out>, na=0, n=<optimized
out>, pp_stack=0x7ffd46ba22b0, func=<optimized out>) at Python/ceval.c:4129
#36 call_function (oparg=<optimized out>, pp_stack=0x7ffd46ba22b0) at
Python/ceval.c:4054
#37 PyEval_EvalFrameEx (f=f@entry=0x7ff1d90bf5c0, throwflag=throwflag@entry=0)
at Python/ceval.c:2679
#38 0x00007ff1d8d3ec3e in PyEval_EvalCodeEx (co=co@entry=0x7ff1d90c5e30,
globals=globals@entry=0x7ff1d91b7168, locals=locals@entry=0x7ff1d91b7168,
args=args@entry=0x0, argcount=argcount@entry=0, kws=kws@entry=0x0, 
    kwcount=kwcount@entry=0, defs=defs@entry=0x0, defcount=defcount@entry=0,
closure=closure@entry=0x0) at Python/ceval.c:3265
#39 0x00007ff1d8d6d5d2 in PyEval_EvalCode (co=co@entry=0x7ff1d90c5e30,
globals=globals@entry=0x7ff1d91b7168, locals=locals@entry=0x7ff1d91b7168) at
Python/ceval.c:667
#40 0x00007ff1d8d79d4d in run_mod (mod=mod@entry=0x23b8cf8,
filename=filename@entry=0x7ffd46ba2e5d "/usr/share/virt-manager/virt-manager",
globals=globals@entry=0x7ff1d91b7168, locals=locals@entry=0x7ff1d91b7168, 
    flags=flags@entry=0x7ffd46ba2500, arena=arena@entry=0x23a3f80) at
Python/pythonrun.c:1371
#41 0x00007ff1d8d05f8c in PyRun_FileExFlags (fp=fp@entry=0x23a2820,
filename=filename@entry=0x7ffd46ba2e5d "/usr/share/virt-manager/virt-manager",
start=start@entry=257, globals=globals@entry=0x7ff1d91b7168, 
    locals=locals@entry=0x7ff1d91b7168, closeit=closeit@entry=1,
flags=flags@entry=0x7ffd46ba2500) at Python/pythonrun.c:1357
#42 0x00007ff1d8d06b6e in PyRun_SimpleFileExFlags (fp=fp@entry=0x23a2820,
filename=<optimized out>, filename@entry=0x7ffd46ba2e5d
"/usr/share/virt-manager/virt-manager", closeit=closeit@entry=1,
flags=flags@entry=0x7ffd46ba2500)
    at Python/pythonrun.c:949
#43 0x00007ff1d8d070a8 in PyRun_AnyFileExFlags (fp=fp@entry=0x23a2820,
filename=filename@entry=0x7ffd46ba2e5d "/usr/share/virt-manager/virt-manager",
closeit=closeit@entry=1, flags=flags@entry=0x7ffd46ba2500)
    at Python/pythonrun.c:753
#44 0x00007ff1d8d0e7c4 in Py_Main (argc=<optimized out>, argv=0x7ffd46ba26b8)
at Modules/main.c:640
#45 0x00007ff1d86d48c5 in __libc_start_main (main=0x400760 <main>, argc=3,
argv=0x7ffd46ba26b8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7ffd46ba26a8) at libc-start.c:289
#46 0x0000000000400799 in _start () at ../sysdeps/x86_64/start.S:118