Package: libmutter-7-0 Version: 3.38.3-2 Severity: normal X-Debbugs-Cc: bernhardu@mailbox.org Dear Maintainer, I tried to replicate #982572, therefore setup a qemu VM with two qxl devices [1]. This is currently running a kernel 5.2 due to #983934. Inside I have trouble with mouse input, therefore activated remote access by keyboard. (Unfortunately can just access one of the two screens with this method.) On that screen I did some resolution changes and window moves, then gnome-shell crashed. I have not yet tried to reproduce this or cannot say if this happens because of this special setup. Found also no other down- or any upstream bug about this. It seems that we get in [3] a nullpointer for "monitor_mode", that gets dereferenced later. In [2] are the last frames of the backtrace, complete in attached file. Kind regards, Bernhard [3] https://sources.debian.org/src/mutter/3.38.3-3/src/backends/meta-renderer.c/#L228 [2] (gdb) bt #0 meta_monitor_mode_foreach_crtc (monitor=monitor@entry=0x55c936bd45a0, mode=0x0, func=func@entry=0x7fbadddaf010 , user_data=user_data@entry=0x7fff8032e9e0, error=error@entry=0x0) at ../src/backends/meta-monitor.c:1912 #1 0x00007fbadddaefe5 in meta_renderer_real_get_views_for_monitor (renderer=, monitor=0x55c936bd45a0) at ../src/backends/meta-renderer.c:228 #2 0x00007fbadde3190f in is_redraw_queued (monitor_src=0x7fbacc039150) at ../src/backends/meta-screen-cast-monitor-stream-src.c:210 #3 sync_cursor_state (monitor_src=0x7fbacc039150) at ../src/backends/meta-screen-cast-monitor-stream-src.c:228 #4 0x00007fbadeab80a2 in g_closure_invoke (closure=0x55c9376dd460, return_value=return_value@entry=0x0, n_param_values=1, param_values=param_values@entry=0x7fff8032ebd0, invocation_hint=invocation_hint@entry=0x7fff8032eb50) at ../../../gobject/gclosure.c:810 #5 0x00007fbadeaca602 in signal_emit_unlocked_R (node=node@entry=0x55c936648d40, detail=detail@entry=0, instance=instance@entry=0x7fbac0002280, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fff8032ebd0) at ../../../gobject/gsignal.c:3809 #6 0x00007fbadead06cf in g_signal_emit_valist (instance=, signal_id=, detail=, var_args=var_args@entry=0x7fff8032ed50) at ../../../gobject/gsignal.c:3495 #7 0x00007fbadead0c3f in g_signal_emit (instance=, signal_id=, detail=) at ../../../gobject/gsignal.c:3551 #8 0x00007fbadde4cdba in meta_wayland_pointer_set_focus (pointer=0x55c936be7820, surface=) at ../src/wayland/meta-wayland-pointer.c:973 #9 0x00007fbadde4d40d in repick_for_event (pointer=0x55c936be7820, for_event=) at ../src/wayland/meta-wayland-pointer.c:640 ... [1] -spice port=5930,addr=$LOCALIP,disable-ticketing -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1 -device qxl,id=video1,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1 -- System Information: Debian Release: bullseye/sid APT prefers testing-debug APT policy: (500, 'testing-debug'), (500, 'proposed-updates-debug'), (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 5.2.0-3-amd64 (SMP w/4 CPU threads) Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages libmutter-7-0 depends on: ii adwaita-icon-theme 3.38.0-1 ii gsettings-desktop-schemas 3.38.0-2 ii libatk1.0-0 2.36.0-2 ii libc6 2.31-9 ii libcairo-gobject2 1.16.0-5 ii libcairo2 1.16.0-5 ii libcanberra0 0.30-7 ii libdrm2 2.4.104-1 ii libegl1 1.3.2-1 ii libfontconfig1 2.13.1-4.2 ii libfribidi0 1.0.8-2 ii libgbm1 20.3.4-1 ii libgdk-pixbuf-2.0-0 2.42.2+dfsg-1 ii libgl1 1.3.2-1 ii libglib2.0-0 2.66.7-1 ii libgnome-desktop-3-19 3.38.4-1 ii libgraphene-1.0-0 1.10.4+dfsg1-1 ii libgtk-3-0 3.24.24-1 ii libgudev-1.0-0 234-1 ii libice6 2:1.0.10-1 ii libinput10 1.16.4-3 ii libjson-glib-1.0-0 1.6.2-1 ii libpango-1.0-0 1.46.2-3 ii libpangocairo-1.0-0 1.46.2-3 ii libpangoft2-1.0-0 1.46.2-3 ii libpipewire-0.3-0 0.3.19-4 ii libsm6 2:1.2.3-1 ii libstartup-notification0 0.12-6+b1 ii libsystemd0 247.3-1 ii libudev1 247.3-1 ii libwacom2 1.8-2 ii libwayland-server0 1.18.0-2~exp1.1 ii libx11-6 2:1.7.0-2 ii libx11-xcb1 2:1.7.0-2 ii libxau6 1:1.0.9-1 ii libxcb-randr0 1.14-3 ii libxcb-res0 1.14-3 ii libxcb1 1.14-3 ii libxcomposite1 1:0.4.5-1 ii libxcursor1 1:1.2.0-2 ii libxdamage1 1:1.1.5-2 ii libxext6 2:1.3.3-1.1 ii libxfixes3 1:5.0.3-2 ii libxi6 2:1.7.10-1 ii libxinerama1 2:1.1.4-2 ii libxkbcommon-x11-0 1.0.3-2 ii libxkbcommon0 1.0.3-2 ii libxkbfile1 1:1.1.0-1 ii libxrandr2 2:1.5.1-1 ii libxtst6 2:1.2.3-1 ii mutter-common 3.38.3-2 libmutter-7-0 recommends no packages. libmutter-7-0 suggests no packages. Versions of packages libmutter-7-0 is related to: ii libegl-mesa0 [libegl-vendor] 20.3.4-1 ii libgl1-mesa-dri 20.3.4-1 ii libglx-mesa0 [libglx-vendor] 20.3.4-1 -- no debconf information Thank you for using reportbug