Package: gnome-flashback
Version: 3.42.0-1
Severity: important
Dear Maintainer,
After updating gnome-flashback today, I am unable to login to the "GNOME
Flashback (Metacity)" sesson - I immediately get the "Oh no, an error occured,
please log out" screen.
Poking around in `journalctl --user` I discovered the following entry at the
time of my login attempt:
gnome-flashback.service: Main process exited, code=killed, status=11/SEGV
After installing systemd-coredump, I managed to extract a backtrace:
#0 gf_logical_monitor_configs_have_monitor
(logical_monitor_configs=logical_monitor_configs@entry=0x55ec78aeb020 =
{...}, monitor_spec=monitor_spec@entry=0x55ec78ad1f50)
at ./backends/gf-logical-monitor-config.c:56
#1 0x000055ec77c8bd48 in gf_monitors_config_new
(monitor_manager=monitor_manager@entry=0x7fa438003d70,
logical_monitor_configs=logical_monitor_configs@entry=0x55ec78aeb020 = {...},
layout_mode=layout_mode@entry=GF_LOGICAL_MONITOR_LAYOUT_MODE_PHYSICAL,
flags=flags@entry=GF_MONITORS_CONFIG_FLAG_NONE) at ./backends/gf-monitors-
config.c:179
#2 0x000055ec77c934a6 in create_monitors_config
(match_rule=<optimized out>, positioning=MONITOR_POSITIONING_LINEAR,
config_flags=GF_MONITORS_CONFIG_FLAG_NONE, config_manager=<optimized out>,
config_manager=<optimized out>) at ./backends/gf-monitor-config-manager.c:603
#3 0x000055ec77c8643b in gf_monitor_manager_ensure_configured
(manager=manager@entry=0x7fa438003d70) at ./backends/gf-monitor-manager.c:2786
#4 0x000055ec77c98d79 in gf_monitor_manager_xrandr_ensure_initial_config
(manager=0x7fa438003d70) at ./backends/gf-monitor-manager-xrandr.c:699
#5 0x000055ec77c85ce7 in gf_monitor_manager_setup (manager=0x7fa438003d70) at
./backends/gf-monitor-manager.c:2477
#6 0x000055ec77c841c3 in gf_backend_new
(type=type@entry=GF_BACKEND_TYPE_X11_CM) at ./backends/gf-backend.c:377
#7 0x000055ec77c823e0 in gf_application_init (application=0x55ec78ae4550) at
./gnome-flashback/gf-application.c:328
Looking at the code of gf_logical_monitor_configs_have_monitor(), it takes a
list of GfLogicalMonitorConfig, and the first one in the list looks like:
(gdb) print *((GfLogicalMonitorConfig *)l->data)
$5 = {layout = {x = 3, y = 0, width = 0, height = 0},
monitor_configs = 0xe000100000000 = {<error reading variable>
...which seems very suspicious to me. The second one in the list looks like:
(gdb) print *((GfLogicalMonitorConfig *)logical_monitor_configs->next->data)
$9 = {layout = {x = 0, y = 0, width = 1920, height = 1080},
monitor_configs = 0x55ec78b1ac60 = {0x55ec78b1f020},
transform = GF_MONITOR_TRANSFORM_NORMAL, scale = 1, is_primary = 1,
is_presentation = 0}
...which seems to exactly match the monitor I'm using. There is no third item
in the list.
I walked up the stack to create_monitors_config() where this data structure is
created, and it looks like the `logical_monitor_configs` variable is created,
and then appended to, but never initialised. I don't know if that's actually
the problem, but it's consistent with the symptoms I'm seeing.
-- System Information:
Debian Release: bookworm/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 5.14.0-2-amd64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_WARN, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8),
LANGUAGE=en_AU:en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages gnome-flashback depends on:
ii gnome-flashback-common 3.42.0-1
ii libasound2 1.2.5.1-1
ii libatk1.0-0 2.36.0-2
ii libc6 2.32-4
ii libcairo2 1.16.0-5
ii libcanberra-gtk3-0 0.30-8
ii libcanberra0 0.30-8
ii libgdk-pixbuf-2.0-0 2.42.6+dfsg-2
ii libgdm1 41.0-3
ii libglib2.0-0 2.70.0-3
ii libgnome-bluetooth13 3.34.5-4
ii libgnome-desktop-3-19 41.0-1
ii libgnome-panel0 3.42.0-1
ii libgtk-3-0 3.24.30-3
ii libibus-1.0-5 1.5.25-2
ii libpam0g 1.4.0-10
ii libpango-1.0-0 1.48.10+ds1-1
ii libpangocairo-1.0-0 1.48.10+ds1-1
ii libpolkit-agent-1-0 0.105-31
ii libpolkit-gobject-1-0 0.105-31
ii libpulse-mainloop-glib0 15.0+dfsg1-2
ii libpulse0 15.0+dfsg1-2
ii libsystemd0 249.5-2
ii libx11-6 2:1.7.2-2+b1
ii libx11-xcb1 2:1.7.2-2+b1
ii libxcb-randr0 1.14-3
ii libxext6 2:1.3.4-1
ii libxfixes3 1:5.0.3-2
ii libxi6 2:1.8-1
ii libxkbfile1 1:1.1.0-1
ii libxrandr2 2:1.5.2-1
ii libxxf86vm1 1:1.1.4-1+b2
ii nautilus 41.1-1
Versions of packages gnome-flashback recommends:
ii dbus 1.12.20-3
ii gnome-settings-daemon 41.0-2
ii libpam-gnome-keyring 40.0-3
Versions of packages gnome-flashback suggests:
ii gnome-power-manager 3.32.0-2
-- no debconf information
