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[Chris Halse Rogers <raof@xxxxxxxxxx>]

** Changed in: gnome-desktop3 (Ubuntu Oneiric)
     Assignee: Canonical Desktop Team (canonical-desktop-team) => Chris Halse Rogers (raof)

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https://bugs.launchpad.net/bugs/871188

Title:
  gnome-settings-daemon / check_gl_texture_size deadlock because g-s-d
  has server grab

Status in “gnome-desktop3” package in Ubuntu:
  Triaged
Status in “gnome-desktop3” source package in Oneiric:
  Triaged

Bug description:
  I've noticed for the past week or so that every time I open my laptop
  lid or press the display key, my laptop appears to lock up entirely.
  Initially, I thought this might be a compiz or X bug, as the only
  obvious way to recover is to kill my session and log in again.
  However, I did a bit of debugging this morning and this is due to the
  recent gnome-desktop change to work around bug 824099.

  What happens is:

  1) gnome-settings-daemon takes a server grab
  2) It then runs check_gl_texture_size
  3) check_gl_texture_size hangs in XOpenDisplay because g-s-d has a grab
  4) g-s-d hangs because it waits for check_gl_texture_size to exit
  5) The entire desktop appears to be locked up, because g-s-d never lets go of its grab

  This is repeatable for me - it happens every single time I open my
  laptop lid, which is a bit of an inconvenience tbh (my laptop seems to
  trigger a fake Fn+F7 keypress when this happens, which is another
  matter)

  If you're curious, this is where g-s-d hangs (sorry, I didn't have
  gnome-desktop symbols installed for this one, but the missing symbol
  in frame 9 is screen_update):

  #0  0x00007f93e7b69c3d in __libc_waitpid (pid=<optimized out>, stat_loc=<optimized out>, options=<optimized out>) at ../sysdeps/unix/sysv/linux/waitpid.c:41
  #1  0x00007f93e77435fa in ?? () from /usr/lib/libgnome-desktop-3.so.2
  #2  0x00007f93e774477b in gnome_rr_config_applicable () from /usr/lib/libgnome-desktop-3.so.2
  #3  0x00007f93d7dfa19d in auto_configure_outputs (timestamp=1506448, manager=0xb64190) at gsd-xrandr-manager.c:1564
  #4  on_randr_event (screen=<optimized out>, data=<optimized out>) at gsd-xrandr-manager.c:1681
  #5  0x00007f93e68db0a4 in g_closure_invoke (closure=0xb6c890, return_value=0x0, n_param_values=1, param_values=0xd68660, invocation_hint=<optimized out>)
      at /build/buildd/glib2.0-2.30.0/./gobject/gclosure.c:774
  #6  0x00007f93e68ed02a in signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=0xb5d180, emission_return=0x0, instance_and_params=0xd68660)
      at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:3272
  #7  0x00007f93e68f66b1 in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=<optimized out>)
      at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:3003
  #8  0x00007f93e68f6852 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:3060
  #9  0x00007f93e77412b4 in ?? () from /usr/lib/libgnome-desktop-3.so.2
  #10 0x00007f93e7741390 in gnome_rr_screen_refresh () from /usr/lib/libgnome-desktop-3.so.2
  #11 0x00007f93d7df9a4a in handle_fn_f7 (timestamp=1505379, mgr=0xb64190) at gsd-xrandr-manager.c:1185
  #12 gsd_xrandr_manager_2_video_mode_switch (timestamp=1505379, manager=0xb64190, error=<optimized out>) at gsd-xrandr-manager.c:677
  #13 handle_method_call (connection=<optimized out>, sender=<optimized out>, object_path=<optimized out>, interface_name=<optimized out>, method_name=<optimized out>,
      parameters=<optimized out>, invocation=0xc482a0, user_data=0xb64190) at gsd-xrandr-manager.c:2047
  #14 0x00007f93e6bcb620 in call_in_idle_cb (user_data=<optimized out>) at /build/buildd/glib2.0-2.30.0/./gio/gdbusconnection.c:4446
  #15 0x00007f93e6211a5d in g_main_dispatch (context=0xac1600) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:2441
  #16 g_main_context_dispatch (context=0xac1600) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:3011
  #17 0x00007f93e6212258 in g_main_context_iterate (context=0xac1600, block=<optimized out>, dispatch=1, self=<optimized out>) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:3089
  #18 0x00007f93e6212792 in g_main_loop_run (loop=0x7f93d8016810) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:3297
  #19 0x00007f93e722ce1d in gtk_main () at /build/buildd/gtk+3.0-3.2.0/./gtk/gtkmain.c:1367
  #20 0x0000000000403caf in main (argc=1, argv=0x7fffd483a4f8) at main.c:466

  And check_gl_texture_size:

  #0  0x00007f7ad6716738 in __GI___poll (fds=0x7fff42d8f530, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:83
  #1  0x00007f7ad642eecd in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
  #2  0x00007f7ad642d369 in xcb_connect_to_fd () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
  #3  0x00007f7ad64301d8 in xcb_connect_to_display_with_auth_info () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
  #4  0x00007f7ad6c7ba02 in _XConnectXCB (dpy=0x1b90010, display=0x0, screenp=0x7fff42d8f87c) at ../../src/xcb_disp.c:78
  #5  0x00007f7ad6c6b741 in XOpenDisplay (display=0x0) at ../../src/OpenDis.c:129
  #6  0x0000000000400872 in main (argc=<optimized out>, argv=<optimized out>) at check_gl_texture_size.c:12

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