dbus-python: Segmentation fault v 1.2.4
Submitted by Tony Asleson
Assigned to Simon McVittie
Description
Created attachment 127653 Core file
While running the unit tests:
https://git.fedorahosted.org/cgit/lvm2.git/tree/test/dbus
for:
https://git.fedorahosted.org/cgit/lvm2.git/tree/daemons/lvmdbusd
if I run the unit test in a loop, usually with a count <= 20 the dbus service will seg. fault.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 DBusPyConnection_GetObjectPathHandlers (self=self@entry=0x7fe326f47990, path=path@entry=0x7fe314cc70b0) at ../_dbus_bindings/conn.c:141
141 Py_INCREF(callbacks);bt
#0 0x00007efc180dc9c2 in DBusPyConnection_GetObjectPathHandlers (self=self@entry=<SystemBus(_bus_type=1, _signals_lock=<_thread.lock at remote 0x7efc2478e7d8>, _bus_names=<WeakValueDictionary(_pending_removals=[], _iterating=set(), _remove=<function at remote 0x7efc246dc6a8>, data={'com.redhat.lvmdbus1': <KeyedRef at remote 0x7efc14714bf8>}) at remote 0x7efc14725160>, _signal_recipients_by_object_path={}, _dbus_Connection_initialized=1, _Connection__call_on_disconnection=[], _signal_sender_matches={}) at remote 0x7efc246dfa40>, path=path@entry=b'com.redhat.lvmdbus1.Snapshot') at ../_dbus_bindings/conn.c:141
#1 0x00007efc180dd490 in _object_path_message (conn=<optimized out>, message=message@entry=0x5608172c8f50, user_data=user_data@entry=0x7efc147329b0) at ../_dbus_bindings/conn-methods.c:98
#2 0x00007efc17ea7a33 in _dbus_object_tree_dispatch_and_unlock (tree=0x56081706b730, message=message@entry=0x5608172c8f50, found_object=found_object@entry=0x7fff5c0dd648) at ../../dbus/dbus-object-tree.c:1020
#3 0x00007efc17e990a4 in dbus_connection_dispatch (connection=connection@entry=0x5608172c46d0) at ../../dbus/dbus-connection.c:4744
#4 0x00007efc15af38d5 in message_queue_dispatch (source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at dbus-gmain.c:90
#5 0x00007efc155d26ba in g_main_context_dispatch (context=0x5608172c62f0) at gmain.c:3154
#6 0x00007efc155d26ba in g_main_context_dispatch (context=context@entry=0x5608172c62f0) at gmain.c:3769
#7 0x00007efc155d2a70 in g_main_context_iterate (context=0x5608172c62f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3840
#8 0x00007efc155d2d92 in g_main_loop_run (loop=0x5608172c4bb0) at gmain.c:4034
#9 0x00007efc1c3ecc58 in ffi_call_unix64 () at ../src/x86/unix64.S:76
#10 0x00007efc1c3ec6ba in ffi_call (cif=cif@entry=0x5608172e4808, fn=<optimized out>, rvalue=<optimized out>, rvalue@entry=0x7fff5c0dd970, avalue=0x5608171fb418) at ../src/x86/ffi64.c:525
#11 0x00007efc14d9cf4c in pygi_invoke_c_callable (function_cache=0x5608172e4760, state=<optimized out>, py_args=<optimized out>, py_kwargs=<optimized out>) at pygi-invoke.c:674
#12 0x00007efc14d9ea1a in pygi_function_cache_invoke (function_cache=<optimized out>, py_args=py_args@entry=(<MainLoop(_signal_source=4) at remote 0x7efc1470f8e8>,), py_kwargs=<optimized out>) at pygi-cache.c:859
#13 0x00007efc14d9d6a8 in pygi_callable_info_invoke (info=<optimized out>, py_args=py_args@entry=(<MainLoop(_signal_source=4) at remote 0x7efc1470f8e8>,), kwargs=<optimized out>, cache=<optimized out>, user_data=user_data@entry=0x0)
at pygi-invoke.c:717
#14 0x00007efc14d9d6dc in _wrap_g_callable_info_invoke (self=<optimized out>, py_args=py_args@entry=(<MainLoop(_signal_source=4) at remote 0x7efc1470f8e8>,), kwargs=<optimized out>) at pygi-invoke.c:754
#15 0x00007efc14d92619 in _callable_info_call (self=0x7efc14741c70, args=(), kwargs=0x0) at pygi-info.c:557
#16 0x00007efc241d7c67 in PyObject_Call (func=<gi.FunctionInfo at remote 0x7efc14741c70>, arg=<optimized out>, kw=<optimized out>) at /usr/src/debug/Python-3.5.1/Objects/abstract.c:2165
#17 0x00007efc2429267e in PyEval_EvalFrameEx (nk=<optimized out>, na=0, pp_stack=0x7fff5c0ddb80, func=<optimized out>) at /usr/src/debug/Python-3.5.1/Python/ceval.c:4916
#18 0x00007efc2429267e in PyEval_EvalFrameEx (oparg=<optimized out>, pp_stack=0x7fff5c0ddb80) at /usr/src/debug/Python-3.5.1/Python/ceval.c:4712
#19 0x00007efc2429267e in PyEval_EvalFrameEx (f=f@entry=Frame 0x7efc147483c8, for file /usr/lib64/python3.5/site-packages/gi/overrides/GLib.py, line 573, in run (self=<MainLoop(_signal_source=4) at remote 0x7efc1470f8e8>), throwflag=throwflag@entry=0) at /usr/src/debug/Python-3.5.1/Python/ceval.c:3209
#20 0x00007efc24297753 in _PyEval_EvalCodeWithName (_co=<optimized out>, globals=<optimized out>, locals=locals@entry=0x0, args=args@entry=0x56081725b4f0, argcount=1, kws=0x56081725b4f8, kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, closure=(<cell at remote 0x7efc14fd83d8>,), name='run', qualname='MainLoop.run') at /usr/src/debug/Python-3.5.1/Python/ceval.c:3995
#21 0x00007efc24293e19 in PyEval_EvalFrameEx (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7fff5c0ddd90, func=<optimized out>) at /usr/src/debug/Python-3.5.1/Python/ceval.c:4793
#22 0x00007efc24293e19 in PyEval_EvalFrameEx (oparg=<optimized out>, pp_stack=0x7fff5c0ddd90) at /usr/src/debug/Python-3.5.1/Python/ceval.c:4710
#23 0x00007efc24293e19 in PyEval_EvalFrameEx (f=f@entry=Frame 0x56081725b338, for file /home/tasleson/projects/lvm2/daemons/lvmdbusd/main.py, line 190, in main (start=<float at remote 0x7efc1bd530c0>, parser=<ArgumentParser(prog='lvmdbusd', usage=None, epilog=None, _mutually_exclusive_groups=[], _negative_number_matcher=<_sre.SRE_Pattern at remote 0x7efc147a63d8>, _defaults={}, formatter_class=<type at remote 0x5608172b6bf8>, allow_abbrev=True, _optionals=<_ArgumentGroup(prefix_chars='-', _group_actions=[<_HelpAction(dest='help', help='show this help message and exit', container=<...>, const=None, option_strings=['-h', '--help'], required=False, default='==SUPPRESS==', choices=None, metavar=None, type=None, nargs=0) at remote 0x7efc246d9080>, <_StoreTrueAction(dest='use_udev', help='Use udev for updating state', container=<...>, const=True, option_strings=['--udev'], required=False, default=False, choices=None, metavar=None, type=None, nargs=0) at remote 0x7efc246e5d68>, <_StoreTrueAction(dest='debug', help='Dump debug messages', container=<...>, const=True, optio...(truncated), throwflag=throwflag@entry=0) at /usr/src/debug/Python-3.5.1/Python/ceval.c:3209
#24 0x00007efc24295d3b in PyEval_EvalFrameEx (nk=<optimized out>, na=<optimized out>, n=0, pp_stack=0x7fff5c0dded0, func=<optimized out>) at /usr/src/debug/Python-3.5.1/Python/ceval.c:4783
#25 0x00007efc24295d3b in PyEval_EvalFrameEx (oparg=<optimized out>, pp_stack=0x7fff5c0dded0) at /usr/src/debug/Python-3.5.1/Python/ceval.c:4710
#26 0x00007efc24295d3b in PyEval_EvalFrameEx (f=f@entry=Frame 0x7efc247f8828, for file ./lvmdbusd, line 16, in <module> (), throwflag=throwflag@entry=0) at /usr/src/debug/Python-3.5.1/Python/ceval.c:3209
#27 0x00007efc24297753 in _PyEval_EvalCodeWithName (_co=_co@entry=<code at remote 0x7efc24762930>, globals=globals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}, locals=locals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}, args=args@entry=0x0, argcount=argcount@entry=0, kws=kws@entry=0x0, kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0) at /usr/src/debug/Python-3.5.1/Python/ceval.c:3995
#28 0x00007efc24297833 in PyEval_EvalCodeEx (_co=_co@entry=<code at remote 0x7efc24762930>, globals=globals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}, locals=locals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}, args=args@entry=0x0, argcount=argcount@entry=0, kws=kws@entry=0x0, kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0) at /usr/src/debug/Python-3.5.1/Python/ceval.c:4016
#29 0x00007efc2429785b in PyEval_EvalCode (co=co@entry=<code at remote 0x7efc24762930>, globals=globals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}, locals=locals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}) at /usr/src/debug/Python-3.5.1/Python/ceval.c:797
#30 0x00007efc242b6d84 in run_mod (mod=mod@entry=0x560816fe3ab0, filename=filename@entry='./lvmdbusd', globals=globals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}, locals=locals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}, flags=flags@entry=0x7fff5c0de1c0, arena=arena@entry=0x560816fcece0)
at /usr/src/debug/Python-3.5.1/Python/pythonrun.c:970
#31 0x00007efc242b9325 in PyRun_FileExFlags (fp=fp@entry=0x560816f71f60, filename_str=filename_str@entry=0x7efc247ae050 "./lvmdbusd", start=start@entry=257, globals=globals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}, locals=locals@entry={'sys': <module at remote 0x7efc247c3e08>, '__builtins__': <module at remote 0x7efc248335e8>, '__file__': './lvmdbusd', '__name__': '__main__', '__doc__': None, '__spec__': None, '__cached__': None, 'main': <function at remote 0x7efc14723b70>, '__loader__': <SourceFileLoader(name='__main__', path='./lvmdbusd') at remote 0x7efc24758128>, '__package__': None}, closeit=closeit@entry=1, flags=0x7fff5c0de1c0)
at /usr/src/debug/Python-3.5.1/Python/pythonrun.c:923
#32 0x00007efc242b9495 in PyRun_SimpleFileExFlags (fp=fp@entry=0x560816f71f60, filename=<optimized out>, closeit=closeit@entry=1, flags=flags@entry=0x7fff5c0de1c0) at /usr/src/debug/Python-3.5.1/Python/pythonrun.c:396
#33 0x00007efc242b9903 in PyRun_AnyFileExFlags (fp=fp@entry=0x560816f71f60, filename=<optimized out>, closeit=closeit@entry=1, flags=flags@entry=0x7fff5c0de1c0) at /usr/src/debug/Python-3.5.1/Python/pythonrun.c:80
#34 0x00007efc242d002c in Py_Main (p_cf=0x7fff5c0de1c0, filename=0x560816f0f260 L"./lvmdbusd", fp=0x560816f71f60) at /usr/src/debug/Python-3.5.1/Modules/main.c:318
#35 0x00007efc242d002c in Py_Main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/Python-3.5.1/Modules/main.c:768
#36 0x0000560815813b70 in main (argc=2, argv=<optimized out>) at /usr/src/debug/Python-3.5.1/Programs/python.c:69From looking around in the core I see that:
(gdb) print callbacks
$1 = 0x0
(gdb) whatis callbacks
type = PyObject *Which is quite interesting considering the code explicitly checks for NULL on line 135.
127 /* On KeyError or if unregistration is in progress, return None. */ 128 PyObject * 129 DBusPyConnection_GetObjectPathHandlers(PyObject *self, PyObject *path) 130 { 131 PyObject *callbacks; 132 133 TRACE(self); 134 callbacks = PyDict_GetItem(((Connection *)self)->object_paths,path); 135 if (!callbacks) { 136 if (PyErr_ExceptionMatches(PyExc_KeyError)) { 137 PyErr_Clear(); 138 Py_RETURN_NONE; 139 } 140 } 141 Py_INCREF(callbacks); 142 return callbacks; 143 }
Specifics (Fedora 24 x86_64): dbus-python: py3 1.2.4 Python: 3.5.1
Attachment 127653, "Core file":
lvm_dbus_core.2027.gz