cheese crashes on start

[Tobias Wolter]

cheese segfaults while starting. I'm guessing the extra info you'll find attached won't be of use as the cheese apport hook fails:

ERROR: hook /usr/share/apport/package-hooks/source_cheese.py crashed:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport/report.py", line 197, in _run_hook
    symb['add_info'](report, ui)
  File "/usr/share/apport/package-hooks/source_cheese.py", line 16, in add_info
    report['lspci'] = command_output(['lspci', '-vvnn'])
NameError: name 'command_output' is not defined

Anyway, I've got a backtrace of the actual issue:

Core was generated by `cheese'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 notify_swap_buffers (swap_event=<optimised out>, swap_event=<optimised out>, context=<optimised out>) at ./winsys/cogl-winsys-glx.c:439
439 ./winsys/cogl-winsys-glx.c: No such file or directory.
(gdb) bt
#0 notify_swap_buffers (swap_event=<optimised out>, swap_event=<optimised out>, context=<optimised out>) at ./winsys/cogl-winsys-glx.c:439
#1 glx_event_filter_cb (xevent=0x7fff39947210, data=0x167f960) at ./winsys/cogl-winsys-glx.c:561
#2 0x00007fc21b7cbc68 in _cogl_renderer_handle_native_event (renderer=<optimised out>, event=0x7fff39947210) at ./cogl-renderer.c:732
#3 0x00007fc21e2221c0 in ?? () from /tmp/apport_sandbox_E0rYbK/usr/lib/x86_64-linux-gnu/libclutter-1.0.so.0
#4 0x00007fc21e22226e in ?? () from /tmp/apport_sandbox_E0rYbK/usr/lib/x86_64-linux-gnu/libclutter-1.0.so.0
#5 0x00007fc21e223f02 in clutter_x11_handle_event () from /tmp/apport_sandbox_E0rYbK/usr/lib/x86_64-linux-gnu/libclutter-1.0.so.0
#6 0x00007fc21e549ef0 in ?? () from /tmp/apport_sandbox_E0rYbK/usr/lib/x86_64-linux-gnu/libclutter-gtk-1.0.so.0
#7 0x00007fc21d4c4a31 in gdk_event_apply_filters (xevent=xevent@entry=0x7fff39947210, event=event@entry=0x7fc1d80275f0, window=window@entry=0x0) at /build/buildd/gtk+3.0-3.14.4/./gdk/x11/gdkeventsource.c:81
#8 0x00007fc21d4c4cf1 in gdk_event_source_translate_event (xevent=0x7fff39947210, event_source=0x10ff7f0) at /build/buildd/gtk+3.0-3.14.4/./gdk/x11/gdkeventsource.c:195
#9 _gdk_x11_display_queue_events (display=0x10fc060) at /build/buildd/gtk+3.0-3.14.4/./gdk/x11/gdkeventsource.c:338
#10 0x00007fc21d49b859 in gdk_display_get_event (display=display@entry=0x10fc060) at /build/buildd/gtk+3.0-3.14.4/./gdk/gdkdisplay.c:321
#11 0x00007fc21d4c4ab2 in gdk_event_source_dispatch (source=<optimised out>, callback=<optimised out>, user_data=<optimised out>) at /build/buildd/gtk+3.0-3.14.4/./gdk/x11/gdkeventsource.c:360
#12 0x00007fc21c9c2c5d in g_main_dispatch (context=0x10cea20) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:3111
#13 g_main_context_dispatch (context=context@entry=0x10cea20) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:3710
#14 0x00007fc21c9c2f48 in g_main_context_iterate (context=context@entry=0x10cea20, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimised out>) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:3781
#15 0x00007fc21c9c2ffc in g_main_context_iteration (context=0x10cea20, context@entry=0x0, may_block=may_block@entry=1) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:3842
#16 0x00007fc21cf7f1ac in g_application_run (application=0x10a4100, argc=1, argv=0x7fff399475b8) at /build/buildd/glib2.0-2.42.1/./gio/gapplication.c:2282
#17 0x0000000000413e06 in _vala_main ()
#18 0x00007fc21c3b7ec5 in __libc_start_main (main=0x40aa00 <main>, argc=1, argv=0x7fff399475b8, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7fff399475a8) at libc-start.c:287
#19 0x000000000040aa43 in _start ()

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: cheese 3.14.0-1ubuntu1~utopic1 [origin: LP-PPA-gnome3-team-gnome3-staging]
Uname: Linux 3.17.1-031701-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Dec 10 13:30:42 2014
InstallationDate: Installed on 2013-05-06 (582 days ago)
InstallationMedia: Ubuntu-GNOME 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: cheese
UpgradeStatus: Upgraded to utopic on 2014-10-23 (47 days ago)

[Tobias Wolter (towo)]

So this seems to be partially related to having Redshift running, which modifies the display colour values with xrandr.

[Bruce Pieterse (octoquad)]

Hi Tobias,

I was trying to reproduce this crash, and I think I was successful. If I fire cheese from the command line the first time around I get a segmentation fault, and then if I do it again from the command line, it works normally. If I close it and then run it again from the command line it crashes again with a segmentation fault. If I fire it up again it works normally. I have already tried to obtain a backtrace with GDB and Valgrind, but it was a bit difficult because if I use a debugger cheese opens fine all the time!

I have filed a new bug report against cheese which has just completed a stack trace and the segmentation fault is the same as this one.
This report is currently private, but once a bug triager has had a look and removed any personal information, I will mark this bug as a duplicate of #1407433 as it has more useful information for developers to fix this.

Out of curiosity could you try opening cheese again from a command line twice and tell me if you get the same behaviour as described above or if it crashes on every start. This wasn't indicated in your bug report.

Thanks