crash under qemu with virtio-gpu in gles2_bind_buffer

[kallisti5]

Please fill out the following:

• Sway Version: Sway 1.7

• Debug Log:

• Configuration File: Default config

• Description: Starting the default sway window manager on EndeavourOS. Wouldn't launch via display manager, so attempted to launch via cli (init 3 boot)

[kallisti5]

For reproducability:

qemu-system-x86_64 --enable-kvm -m 8G -hda endevor.qcow2 -device virtio-gpu -vga virtio

QEMU emulator version 6.2.0

working on getting a backtrace. Need to recompile with debug symbols

[kallisti5]

recompiled master sway and wlroots as debug. reproduced. backtrace attached.

core.txt

[emersion]

(gdb) bt
#0  0x00007fb547e4bf4a in  () at /usr/lib/dri/kms_swrast_dri.so
#1  0x00007fb547f0cc10 in  () at /usr/lib/dri/kms_swrast_dri.so
#2  0x00007fb547f1f4bc in  () at /usr/lib/dri/kms_swrast_dri.so
#3  0x00007fb54899ebf8 in  () at /usr/lib/dri/kms_swrast_dri.so
#4  0x00007fb547ef805b in  () at /usr/lib/dri/kms_swrast_dri.so
#5  0x00007fb54799ce28 in  () at /usr/lib/dri/kms_swrast_dri.so
#6  0x00007fb54a5b9c0b in gles2_bind_buffer
    (wlr_renderer=0x55bad8f0d740, wlr_buffer=0x0)
    at ../render/gles2/renderer.c:162
#7  0x00007fb54a5b557a in renderer_bind_buffer (r=0x55bad8f0d740, buffer=0x0)
    at ../render/wlr_renderer.c:68
#8  0x00007fb54a5e93cb in output_clear_back_buffer (output=0x55bad91918b0)
    at ../types/output/render.c:135
#9  0x00007fb54a5e8514 in wlr_output_commit (output=0x55bad91918b0)
    at ../types/output/output.c:687
#10 0x000055bad700afbc in apply_output_config (oc=0x0, output=0x55bad9050a30)
    at ../sway/config/output.c:497
#11 0x000055bad6fec368 in handle_new_output
    (listener=0x55bad7062730 <server+112>, data=0x55bad91918b0)
    at ../sway/desktop/output.c:900
#12 0x00007fb54a62d983 in wlr_signal_emit_safe
    (signal=0x55bad8485f28, data=0x55bad91918b0) at ../util/signal.c:29
#13 0x00007fb54a5d5c3a in new_output_reemit
    (listener=0x55bad847fcd8, data=0x55bad91918b0)
    at ../backend/multi/backend.c:170
#14 0x00007fb54a62d983 in wlr_signal_emit_safe
    (signal=0x55bad849c358, data=0x55bad91918b0) at ../util/signal.c:29
#15 0x00007fb54a5c7ae6 in scan_drm_connectors (drm=0x55bad849c330, event=0x0)
    at ../backend/drm/drm.c:1413
#16 0x00007fb54a5c1fa5 in backend_start (backend=0x55bad849c330)
    at ../backend/drm/backend.c:25
#17 0x00007fb54a5c0409 in wlr_backend_start (backend=0x55bad849c330)
    at ../backend/backend.c:52
#18 0x00007fb54a5d57c6 in multi_backend_start (wlr_backend=0x55bad8485f00)
    at ../backend/multi/backend.c:33
#19 0x00007fb54a5c0409 in wlr_backend_start (backend=0x55bad8485f00)
    at ../backend/backend.c:52
#20 0x000055bad6fe682a in server_start (server=0x55bad70626c0 <server>)
    at ../sway/server.c:295
#21 0x000055bad6fe5a57 in main (argc=2, argv=0x7ffc8a1f2978)
    at ../sway/main.c:416

[emersion]

Your bug report is missing debug logs. Please add a link to the full debug log file.

sway -d >sway.log 2>&1

[kallisti5]

sway.log

[trunkensailor]

I think I'm having the exact same issue on latest Artix Linux (installed with plasma) (log)

[ForTheReallys]

I was able to get around this issue by using -device virtio-vga-gl -vga none -display sdl,gl=on. My cursor is flipped and offset downwards but I was able to get sway running with virtio

[rlbdv]

I believe I just saw the same thing in Debian sway 1.8.1-1, qemu 7.2+dfsg-5. Pointer offset made it somewhat untenable.

[brandsimon]

Is this related to Crash with misbehaving wayland compositor that doesn't send wl_buffer.release? (Not using the software renderer (virtio-vga-gl) fixes the issue)

[joanbm]

Not sure if performance is any good compared to GLES2, but it works using the Pixman renderer:

WLR_RENDERER=pixman sway

See also: https://gitlab.com/fedora/sigs/sway/sway-config-fedora/-/blob/66f553d999b8f7e57fe924a6b53f1c9078acbc95/sway/start-sway#L32

[brandsimon]

@joanbm Thank you very much! On virtio-gpu-pci performance seams to be even faster with debian 12, sway 1.7 and pixman compared to debian 11 and stock sway 1.5. At least my personal impression.