connection != NULL assertion in dbus-python

[John (J5) Palmieri]

On Fri, 2006-12-08 at 16:20 +0000, Simon McVittie wrote:
> J5,
> This commit (in my dbus-python git branch on fd.o) might fix your crash -
> it's the only way I can see that a referenced Connection might get a NULL
> DBusConnection. I'll introduce some more checks anyway, though.
> 
> commit 380b44d38d333092bc9fe2eae8b7a836cb2791c7
> Author: Simon McVittie <simon.mcvittie at collabora.co.uk>
> Date:   Fri Dec 8 16:10:12 2006 +0000
> 
>     _dbus_bindings/conn-impl.h: Be more careful that referenced Connections always have a DBusConnection

Here is a bt on the old crash.  I'm going to try with the patch now.  It
looks like we are crashing on isinstance which we use a lot of in sugar.

-- 
John (J5) Palmieri <johnp at redhat.com>
-------------- next part --------------
Script started on Mon Dec 11 21:51:01 2006
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This GDB was configured as "i386-redhat-linux-gnu"...Using host libthread_db library "/lib/libthread_db.so.1".


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Core was generated by `/usr/bin/python /usr/bin/sugar-shell'.
Program terminated with signal 11, Segmentation fault.
#0  PyType_IsSubtype (a=0x0, b=0x81da68c) at Objects/typeobject.c:821
821		if (!(a->tp_flags & Py_TPFLAGS_HAVE_CLASS))
(gdb) where
#0  PyType_IsSubtype (a=0x0, b=0x81da68c) at Objects/typeobject.c:821
#1  0xb7e4b01b in type_call (type=0x81da68c, args=0xb7c2802c, kwds=0x0) at Objects/typeobject.c:432
#2  0xb7e0cec7 in PyObject_Call (func=0x0, arg=0xb7c2802c, kw=0x0) at Objects/abstract.c:1795
#3  0xb7e6fad1 in PyEval_EvalFrame (f=0x81c52cc) at Python/ceval.c:3776
#4  0xb7e731b5 in PyEval_EvalCodeEx (co=0xb6f1a4a0, globals=0xb6f0268c, locals=0x0, args=0xb6f623d8, argcount=1, kws=0x0, kwcount=0, defs=0x0, defcount=0, closure=0x0) at Python/ceval.c:2741
#5  0xb7e24faa in function_call (func=0xb6ba0fb4, arg=0xb6f623cc, kw=0x0) at Objects/funcobject.c:548
#6  0xb7e0cec7 in PyObject_Call (func=0x0, arg=0xb6f623cc, kw=0x0) at Objects/abstract.c:1795
#7  0xb7e13538 in instancemethod_call (func=0xb6f8425c, arg=0xb6f623cc, kw=0x0) at Objects/classobject.c:2532
#8  0xb7e0cec7 in PyObject_Call (func=0x0, arg=0xb7c2802c, kw=0x0) at Objects/abstract.c:1795
#9  0xb7e4f61e in slot_tp_init (self=0xb681120c, args=0xb7c2802c, kwds=0x0) at Objects/typeobject.c:4774
#10 0xb7e4b045 in type_call (type=<value optimized out>, args=0xb7c2802c, kwds=0x0) at Objects/typeobject.c:435
#11 0xb7e0cec7 in PyObject_Call (func=0x0, arg=0xb7c2802c, kw=0x0) at Objects/abstract.c:1795
#12 0xb7e6fad1 in PyEval_EvalFrame (f=0x8057b5c) at Python/ceval.c:3776
#13 0xb7e722dd in PyEval_EvalFrame (f=0x8083ab4) at Python/ceval.c:3651
#14 0xb7e731b5 in PyEval_EvalCodeEx (co=0xb67f1460, globals=0xb67f257c, locals=0x0, args=0xb6f62218, argcount=1, kws=0x0, kwcount=0, defs=0x0, defcount=0, closure=0x0) at Python/ceval.c:2741
#15 0xb7e24faa in function_call (func=0xb67fc0d4, arg=0xb6f6220c, kw=0x0) at Objects/funcobject.c:548
#16 0xb7e0cec7 in PyObject_Call (func=0x0, arg=0xb6f6220c, kw=0x0) at Objects/abstract.c:1795
#17 0xb7e13538 in instancemethod_call (func=0xb6f609dc, arg=0xb6f6220c, kw=0x0) at Objects/classobject.c:2532
#18 0xb7e0cec7 in PyObject_Call (func=0x0, arg=0xb7c2802c, kw=0x0) at Objects/abstract.c:1795
#19 0xb7e6c9dc in PyEval_CallObjectWithKeywords (func=0xb6f609dc, arg=0xb7c2802c, kw=0x0) at Python/ceval.c:3435
#20 0xb7e1739d in PyInstance_New (klass=0xb67f3bfc, arg=0xb7c2802c, kw=0x0) at Objects/classobject.c:588
#21 0xb7e0cec7 in PyObject_Call (func=0x0, arg=0xb7c2802c, kw=0x0) at Objects/abstract.c:1795
#22 0xb7e6fad1 in PyEval_EvalFrame (f=0x8082e8c) at Python/ceval.c:3776
#23 0xb7e731b5 in PyEval_EvalCodeEx (co=0xb7beb760, globals=0xb7c3f824, locals=0xb7c3f824, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0, closure=0x0) at Python/ceval.c:2741
#24 0xb7e73293 in PyEval_EvalCode (co=0xb7beb760, globals=0xb7c3f824, locals=0xb7c3f824) at Python/ceval.c:484
#25 0xb7e90078 in run_node (n=<value optimized out>, filename=<value optimized out>, globals=0xb7c3f824, locals=0xb7c3f824, flags=0xbfe9a0a4) at Python/pythonrun.c:1285
#26 0xb7e917b8 in PyRun_SimpleFileExFlags (fp=0x804a008, filename=0xbfe9abfa "/usr/bin/sugar-shell", closeit=1, flags=0xbfe9a0a4) at Python/pythonrun.c:869
#27 0xb7e91e9a in PyRun_AnyFileExFlags (fp=0x804a008, filename=0xbfe9abfa "/usr/bin/sugar-shell", closeit=1, flags=0xbfe9a0a4) at Python/pythonrun.c:673
#28 0xb7e98825 in Py_Main (argc=1, argv=0xbfe9a174) at Modules/main.c:493
#29 0x08048582 in main (argc=0, argv=0x0) at Modules/python.c:23
(gdb) quit
]0;olpc at localhost:~[olpc at localhost ~]$ exit

Script done on Mon Dec 11 21:51:39 2006