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Bug 679654 - crash for pango context list_families when going via Gtk
crash for pango context list_families when going via Gtk
Status: RESOLVED FIXED
Product: pango
Classification: Platform
Component: general
1.30.x
Other All
: Normal normal
: ---
Assigned To: pango-maint
pango-maint
Depends on:
Blocks:
 
 
Reported: 2012-07-09 22:28 UTC by Benny Malengier
Modified: 2012-07-20 21:54 UTC
See Also:
GNOME target: ---
GNOME version: ---



Description Benny Malengier 2012-07-09 22:28:10 UTC
Open a python terminal, and type

>>> from gi.repository import Gtk
>>> Gtk.TextView().get_pango_context().list_families()
>>> Gtk.TextView().get_pango_context().list_families()
Segmentation fault (core dumped)

For me; second request always segphaults.
I need the font families for the textview to show in the toolbar as options
Comment 1 Tobias Mueller 2012-07-09 22:36:08 UTC
aye, I can reproduce on a fairly standard Fedora 17 machine.
Comment 2 Tobias Mueller 2012-07-09 22:42:39 UTC
Stacktrace collected by abrt, but too big for this bugzilla. Downstream bugreport here: https://bugzilla.redhat.com/show_bug.cgi?id=838719


Core was generated by `/usr/bin/python /usr/bin/ipython'.
Program terminated with signal 11, Segmentation fault.

Thread 1 (Thread 0x7fcad57a7740 (LWP 3161))

  • #0 pygobject_repr
    at pygobject.c line 1057
  • #1 PyObject_Repr
    at /usr/src/debug/Python-2.7.3/Objects/object.c line 381
  • #2 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4086
  • #3 PyEval_EvalFrameEx
  • #4 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #5 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #6 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #7 PyEval_EvalFrameEx
  • #8 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #9 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #10 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #11 PyEval_EvalFrameEx
  • #12 PyEval_EvalCodeEx
  • #13 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #14 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #15 PyEval_EvalFrameEx
  • #16 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #17 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #18 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #19 PyEval_EvalFrameEx
  • #20 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #21 function_call
  • #22 PyObject_Call
  • #23 instancemethod_call
  • #24 PyObject_Call
  • #25 slot_tp_call
  • #26 PyObject_Call
  • #27 do_call
  • #28 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4121
  • #29 PyEval_EvalFrameEx
  • #30 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #31 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #32 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #33 PyEval_EvalFrameEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 2740
  • #34 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4184
  • #35 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #36 PyEval_EvalFrameEx
  • #37 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #38 function_call
  • #39 PyObject_Call
  • #40 instancemethod_call
  • #41 PyObject_Call
  • #42 slot_tp_call
  • #43 PyObject_Call
  • #44 PyEval_CallObjectWithKeywords
  • #45 PyEval_EvalFrameEx
  • #46 PyEval_EvalCodeEx
  • #47 PyEval_EvalCode
  • #48 exec_statement
  • #49 PyEval_EvalFrameEx
  • #50 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #51 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #52 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #53 PyEval_EvalFrameEx
  • #54 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #55 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #56 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #57 PyEval_EvalFrameEx
  • #58 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #59 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #60 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #61 PyEval_EvalFrameEx
  • #62 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #63 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #64 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #65 PyEval_EvalFrameEx
  • #66 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #67 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #68 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #69 PyEval_EvalFrameEx
  • #70 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #71 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #72 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #73 PyEval_EvalFrameEx
  • #74 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #75 fast_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4194
  • #76 call_function
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 4119
  • #77 PyEval_EvalFrameEx
  • #78 PyEval_EvalCodeEx
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 3330
  • #79 PyEval_EvalCode
    at /usr/src/debug/Python-2.7.3/Python/ceval.c line 689
  • #80 run_mod
    at /usr/src/debug/Python-2.7.3/Python/pythonrun.c line 1361
  • #81 PyRun_FileExFlags
    at /usr/src/debug/Python-2.7.3/Python/pythonrun.c line 1347
  • #82 PyRun_SimpleFileExFlags
    at /usr/src/debug/Python-2.7.3/Python/pythonrun.c line 951
  • #83 PyRun_AnyFileExFlags
    at /usr/src/debug/Python-2.7.3/Python/pythonrun.c line 755
  • #84 Py_Main
    at /usr/src/debug/Python-2.7.3/Modules/main.c line 639
  • #85 __libc_start_main
    at libc-start.c line 226
  • #86 _start
From                To                  Syms Read   Shared Object Library
0x000000314bc3efd0  0x000000314bd1e570  Yes         /lib64/libpython2.7.so.1.0
0x0000003127605790  0x0000003127610494  Yes         /lib64/libpthread.so.0
0x0000003127e00ea0  0x0000003127e019e0  Yes         /lib64/libdl.so.2
0x0000003138e00ee0  0x0000003138e01814  Yes         /lib64/libutil.so.1
0x0000003127a055f0  0x0000003127a6cabc  Yes         /lib64/libm.so.6
0x000000312721ef60  0x000000312735fa40  Yes         /lib64/libc.so.6
0x0000003126a00b20  0x0000003126a1a359  Yes         /lib64/ld-linux-x86-64.so.2
0x00007fcacf0c0370  0x00007fcacf0c28dc  Yes         /usr/lib64/python2.7/lib-dynload/_collectionsmodule.so
0x00007fcaceeb8040  0x00007fcaceeb9ae4  Yes         /usr/lib64/python2.7/lib-dynload/operator.so
0x00007fcaceca7ee0  0x00007fcacecac958  Yes         /usr/lib64/python2.7/lib-dynload/itertoolsmodule.so
0x00007fcaceaa2c60  0x00007fcaceaa32a4  Yes         /usr/lib64/python2.7/lib-dynload/_bisectmodule.so
0x00007fcace89dd60  0x00007fcace89ed34  Yes         /usr/lib64/python2.7/lib-dynload/_heapq.so
0x00007fcace697720  0x00007fcace699de4  Yes         /usr/lib64/python2.7/lib-dynload/stropmodule.so
0x00007fcace4930e0  0x00007fcace493b4c  Yes         /usr/lib64/python2.7/lib-dynload/_functoolsmodule.so
0x00007fcace28eb10  0x00007fcace28fec4  Yes         /usr/lib64/python2.7/lib-dynload/_localemodule.so
0x00007fcace0867d0  0x00007fcace088f10  Yes         /usr/lib64/python2.7/lib-dynload/_struct.so
0x00007fcacde7d4a0  0x00007fcacde806c4  Yes         /usr/lib64/python2.7/lib-dynload/math.so
0x00007fcacdc76190  0x00007fcacdc780cc  Yes         /usr/lib64/python2.7/lib-dynload/binascii.so
0x00007fcacda728a0  0x00007fcacda73468  Yes         /usr/lib64/python2.7/lib-dynload/_hashlib.so
0x0000003131614780  0x0000003131646c94  Yes         /lib64/libssl.so.10
0x000000313025ca00  0x0000003130324528  Yes         /lib64/libcrypto.so.10
0x0000003130a0ad60  0x0000003130a38424  Yes         /lib64/libgssapi_krb5.so.2
0x000000313121b640  0x0000003131293340  Yes         /lib64/libkrb5.so.3
0x000000312f201520  0x000000312f202114  Yes         /lib64/libcom_err.so.2
0x000000312fe04490  0x000000312fe1c92c  Yes         /lib64/libk5crypto.so.3
0x0000003128601f50  0x000000312860e648  Yes         /lib64/libz.so.1
0x0000003130602a60  0x0000003130607eac  Yes         /lib64/libkrb5support.so.0
0x000000312fa01120  0x000000312fa01ac4  Yes         /lib64/libkeyutils.so.1
0x00000031292039b0  0x0000003129211dfc  Yes         /lib64/libresolv.so.2
0x0000003128a029d0  0x0000003128a12148  Yes         /lib64/libgcc_s.so.1
0x0000003128e05fc0  0x0000003128e16768  Yes         /lib64/libselinux.so.1
0x00007fcacd86e260  0x00007fcacd86eea8  Yes         /usr/lib64/python2.7/lib-dynload/_randommodule.so
0x00007fcacd668ba0  0x00007fcacd66995c  Yes         /usr/lib64/python2.7/lib-dynload/cStringIO.so
0x00007fcacd463e20  0x00007fcacd464b34  Yes         /usr/lib64/python2.7/lib-dynload/fcntlmodule.so
0x00007fcacd25eab0  0x00007fcacd25fb28  Yes         /usr/lib64/python2.7/lib-dynload/timemodule.so
0x00007fcacd057cb0  0x00007fcacd059588  Yes         /usr/lib64/python2.7/lib-dynload/selectmodule.so
0x00007fcaccd93040  0x00007fcaccd93720  Yes         /usr/lib64/python2.7/lib-dynload/resource.so
0x00007fcaccb8e5f0  0x00007fcaccb8eed4  Yes         /usr/lib64/python2.7/lib-dynload/termios.so
0x00007fcacc989d80  0x00007fcacc98a238  Yes         /usr/lib64/python2.7/lib-dynload/grpmodule.so
0x00007fcacc7789d0  0x00007fcacc7811a8  Yes         /usr/lib64/python2.7/lib-dynload/datetime.so
0x00007fcacc557a90  0x00007fcacc5665c0  Yes         /usr/lib64/python2.7/lib-dynload/_io.so
0x00007fcacc342620  0x00007fcacc34a328  Yes         /usr/lib64/python2.7/lib-dynload/_curses.so
0x0000003134608670  0x0000003134629a88  Yes         /lib64/libncursesw.so.5
0x000000313a20cd90  0x000000313a218c48  Yes         /lib64/libtinfo.so.5
0x00007fcacc130df0  0x00007fcacc137744  Yes         /usr/lib64/python2.7/lib-dynload/_sqlite3.so
0x000000313c60a2e0  0x000000313c686860  Yes         /lib64/libsqlite3.so.0
0x00007fcacbf13190  0x00007fcacbf20538  Yes         /usr/lib64/python2.7/lib-dynload/_ctypes.so
0x000000312ae01950  0x000000312ae060ec  Yes         /lib64/libffi.so.5
0x00007fcacbcff220  0x00007fcacbd04858  Yes         /usr/lib64/python2.7/lib-dynload/_socketmodule.so
0x00007fcacbaf72a0  0x00007fcacbaf9f40  Yes         /usr/lib64/python2.7/lib-dynload/_ssl.so
0x00007fcacb8ecba0  0x00007fcacb8f03c4  Yes         /usr/lib64/python2.7/lib-dynload/arraymodule.so
0x00007fcacb6e54d0  0x00007fcacb6e6f60  Yes         /usr/lib64/python2.7/lib-dynload/zlibmodule.so
                                        No          /usr/lib64/python2.7/site-packages/_xmlplus/parsers/pyexpat.so
0x000000312b603dd0  0x000000312b61cccc  Yes         /lib64/libexpat.so.1
0x00007fcacb2d3690  0x00007fcacb2d4780  Yes         /usr/lib64/python2.7/lib-dynload/_lsprof.so
0x00007fcacb0c2a00  0x00007fcacb0cd38c  Yes         /usr/lib64/python2.7/lib-dynload/cPickle.so
0x00007fcaca6b9760  0x00007fcaca6ba8f4  Yes         /usr/lib64/python2.7/lib-dynload/readline.so
0x0000003136214f20  0x0000003136233848  Yes         /lib64/libreadline.so.6
0x00007fcaca49c6c0  0x00007fcaca4acfe8  Yes         /usr/lib64/python2.7/site-packages/gi/_gi.so
0x000000313be07b50  0x000000313be248ec  Yes         /usr/lib64/libgirepository-1.0.so.1
0x000000312aa0a910  0x000000312aa37dcc  Yes         /usr/lib64/libgobject-2.0.so.0
0x000000312ce010f0  0x000000312ce01fd8  Yes         /usr/lib64/libgmodule-2.0.so.0
0x0000003129600680  0x00000031296007fc  Yes         /usr/lib64/libgthread-2.0.so.0
0x0000003128202260  0x000000312820554c  Yes         /usr/lib64/librt.so.1
0x0000003126e19b70  0x0000003126eac70c  Yes         /usr/lib64/libglib-2.0.so.0
0x00007fcaca290ac0  0x00007fcaca291938  Yes         /usr/lib64/libpyglib-gi-2.0-python.so.0
0x000000312ea2eee0  0x000000312eaea8a4  Yes         /usr/lib64/libgio-2.0.so.0
0x00007fcaca0825f0  0x00007fcaca087da0  Yes         /usr/lib64/python2.7/site-packages/gi/_glib/_glib.so
0x00007fcac9e60d80  0x00007fcac9e70ddc  Yes         /usr/lib64/python2.7/site-packages/gi/_gobject/_gobject.so
0x000000313826e2a0  0x00000031384ff650  Yes         /usr/lib64/libgtk-3.so.0
0x0000003137e1a080  0x0000003137e5b924  Yes         /lib64/libgdk-3.so.0
0x0000003133e04910  0x0000003133e09358  Yes         /lib64/libpangocairo-1.0.so.0
0x000000312a21dea0  0x000000312a2a4260  Yes         /lib64/libX11.so.6
0x000000312de02130  0x000000312de0bfb4  Yes         /lib64/libXi.so.6
0x000000312e2014f0  0x000000312e203cf8  Yes         /lib64/libXfixes.so.3
0x0000003133a09b30  0x0000003133a15c04  Yes         /lib64/libatk-1.0.so.0
0x00007fcac9b043c0  0x00007fcac9b05374  Yes         /lib64/libcairo-gobject.so.2
0x000000313360b2f0  0x000000313368215c  Yes         /lib64/libcairo.so.2
0x0000003132606750  0x0000003132619b50  Yes         /lib64/libgdk_pixbuf-2.0.so.0
0x0000003132e07600  0x0000003132e21bfc  Yes         /lib64/libpangoft2-1.0.so.0
0x0000003132a0eeb0  0x0000003132a2d490  Yes         /lib64/libpango-1.0.so.0
0x000000312c605ef0  0x000000312c61f6ec  Yes         /lib64/libfontconfig.so.1
0x000000312b203700  0x000000312b20d7d0  Yes         /lib64/libXext.so.6
0x000000312da00b00  0x000000312da01438  Yes         /lib64/libXinerama.so.1
0x000000312d601830  0x000000312d605f34  Yes         /lib64/libXrandr.so.2
0x000000312e602a80  0x000000312e6076dc  Yes         /lib64/libXcursor.so.1
0x0000003134200c30  0x0000003134201774  Yes         /lib64/libXcomposite.so.1
0x0000003132200b90  0x000000313220159c  Yes         /lib64/libXdamage.so.1
0x000000312be0cbc0  0x000000312be77250  Yes         /lib64/libfreetype.so.6
0x000000312a6099c0  0x000000312a615878  Yes         /lib64/libxcb.so.1
0x0000003133208d80  0x0000003133272eec  Yes         /usr/lib64/libpixman-1.so.0
0x000000312ba04fa0  0x000000312ba20ae0  Yes         /usr/lib64/libpng15.so.15
0x000000312ca01a70  0x000000312ca079e0  Yes         /usr/lib64/libXrender.so.1
0x0000003129e00e80  0x0000003129e01bb0  Yes         /lib64/libXau.so.6
0x00007fcac98c31b0  0x00007fcac98ca67c  Yes         /lib64/libnss_files.so.2
0x00007fcac9643930  0x00007fcac965af98  Yes         /usr/lib64/gio/modules/libgvfsdbus.so
0x0000003129a09310  0x0000003129a12c9c  Yes         /lib64/libgvfscommon.so.0
0x00007fcac9410f20  0x00007fcac94300cc  Yes         /lib64/libbluray.so.1
0x000000312c207760  0x000000312c2302b4  Yes         /lib64/libdbus-1.so.3
0x000000312ee2cbc0  0x000000312ef0da74  Yes         /lib64/libxml2.so.2
0x00007fcac9208700  0x00007fcac920a714  Yes         /usr/lib64/gtk-3.0/3.0.0/theming-engines/libadwaita.so
0x000000313e207950  0x000000313e22b9e8  Yes         /lib64/librsvg-2.so.2
0x0000003137208ce0  0x0000003137227428  Yes         /lib64/libcroco-0.6.so.3
0x00007fcac9003020  0x00007fcac9005060  Yes         /usr/lib64/gtk-3.0/modules/libcanberra-gtk-module.so
0x000000313f801cb0  0x000000313f803160  Yes         /lib64/libcanberra-gtk3.so.0
0x0000003146c033c0  0x0000003146c0c31c  Yes         /lib64/libcanberra.so.0
0x0000003141c020b0  0x0000003141c0614c  Yes         /lib64/libvorbisfile.so.3
0x000000313a603810  0x000000313a61ad6c  Yes         /lib64/libvorbis.so.0
0x000000313ae01a70  0x000000313ae04138  Yes         /lib64/libogg.so.0
0x0000003143c02880  0x0000003143c0c010  Yes         /lib64/libtdb.so.1
0x000000313ce02400  0x000000313ce065d4  Yes         /lib64/libltdl.so.7
0x0000003134e00dc0  0x0000003134e05cac  Yes         /lib64/libcrypt.so.1
0x0000003135203520  0x0000003135242538  Yes         /lib64/libfreebl3.so
$1 = 0x0
$2 = 0x0
rax            0x0	0
rbx            0x2fcee10	50130448
rcx            0x0	0
rdx            0x326f5c0	52884928
rsi            0x2fcee10	50130448
rdi            0x2fcee10	50130448
rbp            0x32c9400	0x32c9400
rsp            0x7fffc6a93dc0	0x7fffc6a93dc0
r8             0x3271500	52892928
r9             0x7fcac9e72a7f	140508947491455
r10            0x314bcd2500	211725133056
r11            0x0	0
r12            0x3271340	52892480
r13            0x2a6b769	44480361
r14            0x2fcee10	50130448
r15            0x1	1
rip            0x7fcac9e67d33	0x7fcac9e67d33 <pygobject_repr+51>
eflags         0x10206	[ PF IF RF ]
cs             0x33	51
ss             0x2b	43
ds             0x0	0
es             0x0	0
fs             0x0	0
gs             0x0	0
Dump of assembler code for function pygobject_repr:
   0x00007fcac9e67d00 <+0>:	push   %rbp
   0x00007fcac9e67d01 <+1>:	lea    0xad77(%rip),%r9        # 0x7fcac9e72a7f
   0x00007fcac9e67d08 <+8>:	push   %rbx
   0x00007fcac9e67d09 <+9>:	mov    %rdi,%rbx
   0x00007fcac9e67d0c <+12>:	sub    $0x128,%rsp
   0x00007fcac9e67d13 <+19>:	mov    0x10(%rdi),%rbp
   0x00007fcac9e67d17 <+23>:	mov    %fs:0x28,%rax
   0x00007fcac9e67d20 <+32>:	mov    %rax,0x118(%rsp)
   0x00007fcac9e67d28 <+40>:	xor    %eax,%eax
   0x00007fcac9e67d2a <+42>:	test   %rbp,%rbp
   0x00007fcac9e67d2d <+45>:	je     0x7fcac9e67d3e <pygobject_repr+62>
   0x00007fcac9e67d2f <+47>:	mov    0x0(%rbp),%rax
=> 0x00007fcac9e67d33 <+51>:	mov    (%rax),%rdi
   0x00007fcac9e67d36 <+54>:	callq  0x7fcac9e5fef0 <g_type_name@plt>
   0x00007fcac9e67d3b <+59>:	mov    %rax,%r9
   0x00007fcac9e67d3e <+62>:	mov    0x8(%rbx),%rax
   0x00007fcac9e67d42 <+66>:	lea    0xa727(%rip),%rdx        # 0x7fcac9e72470
   0x00007fcac9e67d49 <+73>:	lea    0x10(%rsp),%rdi
   0x00007fcac9e67d4e <+78>:	mov    %rbx,%r8
   0x00007fcac9e67d51 <+81>:	mov    $0x100,%esi
   0x00007fcac9e67d56 <+86>:	mov    0x18(%rax),%rcx
   0x00007fcac9e67d5a <+90>:	xor    %eax,%eax
   0x00007fcac9e67d5c <+92>:	mov    %rbp,(%rsp)
   0x00007fcac9e67d60 <+96>:	callq  0x7fcac9e60b80 <g_snprintf@plt>
   0x00007fcac9e67d65 <+101>:	lea    0x10(%rsp),%rdi
   0x00007fcac9e67d6a <+106>:	callq  0x7fcac9e603d0 <PyString_FromString@plt>
   0x00007fcac9e67d6f <+111>:	mov    0x118(%rsp),%rdx
   0x00007fcac9e67d77 <+119>:	xor    %fs:0x28,%rdx
   0x00007fcac9e67d80 <+128>:	jne    0x7fcac9e67d8c <pygobject_repr+140>
   0x00007fcac9e67d82 <+130>:	add    $0x128,%rsp
   0x00007fcac9e67d89 <+137>:	pop    %rbx
   0x00007fcac9e67d8a <+138>:	pop    %rbp
   0x00007fcac9e67d8b <+139>:	retq   
   0x00007fcac9e67d8c <+140>:	callq  0x7fcac9e5ff00 <__stack_chk_fail@plt>
End of assembler dump.
Comment 3 Martin Pitt 2012-07-11 06:31:29 UTC

*** This bug has been marked as a duplicate of bug 675332 ***
Comment 4 John Ralls 2012-07-20 21:10:04 UTC
No, this is a different problem, as explained in my analysis at 
https://bugzilla.gnome.org/show_bug.cgi?id=675332#c8

Here is a minimal demonstration of this bug:
>>> from gi.repository import Gtk
>>> def families():
...     m = Gtk.TextView()
...     fl = [f.get_name() for f in m.get_pango_context().list_families()]
...     return fl
... 
>>> f = families()
>>> g = families()
/usr/lib/python2.7/dist-packages/gi/types.py:43: Warning: g_object_get_qdata: assertion `G_IS_OBJECT (object)' failed
  return info.invoke(*args, **kwargs)
/usr/lib/python2.7/dist-packages/gi/types.py:43: Warning: g_ascii_strncasecmp: assertion `s2 != NULL' failed
  return info.invoke(*args, **kwargs)
Segmentation fault

Underlying the crash is that pango creates a list of families once and stores it in a static variable or in a class variable depending upon the implementation. Once pygobject frees the family structs on that list (which it does after the first call to list_families(), as explained in #675332), then any other pango user (it need not be a TextView) that tries to access the list will segfault.

pango_context.font_description is created separately and doesn't have anything to do with the font list.
Comment 5 John Ralls 2012-07-20 21:54:07 UTC
As I suggested in #675332, adding "transfer container" annotations to pango_context_list_families and pango_font_map_list_families corrects the problem.

Pushed to pango master as 0686aea