Bug#827298: Crash: ERROR:gf-desktop-background.c:234:background_changed_cb: assertion failed: (background->background == NULL)

[Sam Morris]

Package: gnome-flashback
Version: 3.20.1-2
Severity: normal

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gnome-flashback just crashed after logging the following:

Jun 14 18:55:33 wintermute gnome-flashback.desktop[13160]: ** (gnome-flashback:13160): WARNING **: Failed to launch ibus-daemon: Failed to execute child process "ibus-daemon" (No such file or directory)
Jun 14 18:55:35 wintermute gnome-flashback.desktop[13160]: **
Jun 14 18:55:35 wintermute gnome-flashback.desktop[13160]: ERROR:gf-desktop-background.c:234:background_changed_cb: assertion failed: (background->background == NULL)

Here's the backtrace:

#0  0x00007fe5a3c31458 in __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
        resultvar = 0
        pid = 13160
        selftid = 13160
#1  0x00007fe5a3c328da in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x1808f10, sa_sigaction = 0x1808f10}, sa_mask = {__val = {108, 140624284164832, 140624349479024, 0, 0, 472446402651, 0, 0, 532575944823, 25202448, 140624275295008, 0, 0, 4294967295, 0, 140624275295064}}, 
          sa_flags = 25202448, sa_restorer = 0x0}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fe5a4571d75 in g_assertion_message () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#3  0x00007fe5a4571e0a in g_assertion_message_expr () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4  0x0000000000423853 in background_changed_cb (user_data=0x15c7480) at gf-desktop-background.c:234
        user_data = 0x15c7480
#5  0x00007fe5a454c05a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#6  0x00007fe5a454c400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#7  0x00007fe5a454c722 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#8  0x0000000000419cff in main (argc=1, argv=0x7ffd97a81348) at gf-main.c:163
        session = 0x133e320


- -- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (555, 'testing'), (520, 'unstable'), (510, 'experimental'), (500, 'unstable-debug')
Architecture: amd64 (x86_64)

Kernel: Linux 4.5.0-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnome-flashback depends on:
ii  gnome-flashback-common   3.20.1-2
ii  libatk1.0-0              2.20.0-1
ii  libc6                    2.22-11
ii  libcairo2                1.14.6-1+b1
ii  libcanberra-gtk3-0       0.30-3
ii  libgdk-pixbuf2.0-0       2.34.0-1
ii  libglib2.0-0             2.48.1-1
ii  libgnome-bluetooth13     3.18.3-1
ii  libgnome-desktop-3-12    3.20.2-1
ii  libgtk-3-0               3.20.6-1
ii  libibus-1.0-5            1.5.11-1
ii  libpango-1.0-0           1.40.1-1
ii  libpangocairo-1.0-0      1.40.1-1
ii  libpolkit-agent-1-0      0.105-15
ii  libpolkit-gobject-1-0    0.105-15
ii  libpulse-mainloop-glib0  8.0-2+b2
ii  libpulse0                8.0-2+b2
ii  libupower-glib3          0.99.4-2
ii  libx11-6                 2:1.6.3-1
ii  libx11-xcb1              2:1.6.3-1
ii  libxcb-randr0            1.11.1-1
ii  libxext6                 2:1.3.3-1
ii  libxkbfile1              1:1.0.9-2
ii  libxrandr2               2:1.5.0-1

Versions of packages gnome-flashback recommends:
ii  dbus                   1.10.8-1
ii  gnome-settings-daemon  3.20.1-2

Versions of packages gnome-flashback suggests:
ii  gnome-power-manager  3.20.0-1

- -- no debconf information

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