On Fri, 5 Jun 2026 at 15:08, Akihiko Odaki <[email protected]> wrote:
> > Note that the environment we run in is X11 without wayland, e.g. a
> > XTigervnc server that provides a X11 display.
>
> Cc'ing Pierre-Eric Pelloux-Prayer
>
> My best bet is that SDL_HINT_VIDEO_X11_FORCE_EGL triggered the host
> issue, but the stack trace cited above contradicts with that. I don't
> exclude the possibility of a QEMU bug either.
>
> Can you confirm the stack trace is from a run with X11? If so, the next
> step would be to symbolize the stack trace. Otherwise, re-generating the
> stack trace with X11 may help.
Please note the comment above about the environment - it is x11
without wayland, provided by xtigervnc.
I got a stack trace with symbols:
#0 0x00007ffff721b4f4 in pthread_mutex_lock () from
/home/akanavin/bitbake-builds/poky-master/build/tmp/sysroots-uninative/x86_64-linux/lib/libc.so.6
#1 0x00007ffff5a9a9e6 in wl_proxy_create_wrapper
(proxy=0x5555583f2940) at
../sources/wayland-1.25.0/src/wayland-client.c:2800
#2 0x00007ffff58bf994 in dri2_initialize_wayland_drm
(disp=0x555559548070) at
../sources/mesa-26.0.6/src/egl/drivers/dri2/platform_wayland.c:2680
#3 0x00007ffff58c0e7e in dri2_initialize_wayland
(disp=disp@entry=0x555559548070) at
../sources/mesa-26.0.6/src/egl/drivers/dri2/platform_wayland.c:3288
#4 0x00007ffff58b899d in dri2_initialize
(disp=disp@entry=0x555559548070) at
../sources/mesa-26.0.6/src/egl/drivers/dri2/egl_dri2.c:895
#5 0x00007ffff58abc3b in eglInitialize (dpy=<optimized out>,
major=0x0, minor=0x0) at
../sources/mesa-26.0.6/src/egl/main/eglapi.c:697
#6 0x00007ffff7cc77f5 in SDL_EGL_LoadLibrary
(_this=_this@entry=0x5555584054a0, egl_path=egl_path@entry=0x0,
native_display=0x5555583f2940, platform=platform@entry=0)
at
/home/akanavin/bitbake-builds/poky-master/build/tmp/work/x86_64-linux/libsdl2-native/2.32.10/sources/SDL2-2.32.10/src/video/SDL_egl.c:547
#7 0x00007ffff7cf4695 in X11_GLES_LoadLibrary
(_this=_this@entry=0x5555584054a0, path=path@entry=0x0)
at
/home/akanavin/bitbake-builds/poky-master/build/tmp/work/x86_64-linux/libsdl2-native/2.32.10/sources/SDL2-2.32.10/src/video/x11/SDL_x11opengles.c:56
#8 0x00007ffff7cf3ec8 in X11_GL_LoadLibrary (_this=0x5555584054a0,
path=<optimized out>)
at
/home/akanavin/bitbake-builds/poky-master/build/tmp/work/x86_64-linux/libsdl2-native/2.32.10/sources/SDL2-2.32.10/src/video/x11/SDL_x11opengl.c:270
#9 0x00007ffff7cd4734 in SDL_GL_LoadLibrary_REAL (path=path@entry=0x0)
at
/home/akanavin/bitbake-builds/poky-master/build/tmp/work/x86_64-linux/libsdl2-native/2.32.10/sources/SDL2-2.32.10/src/video/SDL_video.c:3493
#10 0x00007ffff7cd66c3 in SDL_CreateWindow_REAL (title=0x555556029e87
"", x=536805376, y=536805376, w=1, h=1, flags=42)
at
/home/akanavin/bitbake-builds/poky-master/build/tmp/work/x86_64-linux/libsdl2-native/2.32.10/sources/SDL2-2.32.10/src/video/SDL_video.c:1717
#11 0x00007ffff7c52688 in SDL_CreateWindow (a=a@entry=0x555556029e87
"", b=b@entry=536805376, c=c@entry=536805376, d=<optimized out>,
e=e@entry=1, f=f@entry=42)
at
/home/akanavin/bitbake-builds/poky-master/build/tmp/work/x86_64-linux/libsdl2-native/2.32.10/sources/SDL2-2.32.10/src/dynapi/SDL_dynapi_procs.h:545
#12 0x0000555555be7b04 in sdl2_window_create
(scon=scon@entry=0x5555584240f0) at
../sources/qemu-11.0.0/ui/sdl2.c:106
#13 0x0000555555be92de in sdl2_gl_console_init (scon=0x5555584240f0)
at ../sources/qemu-11.0.0/ui/sdl2-gl.c:306
#14 0x0000555555be78e9 in sdl2_display_init (ds=<optimized out>,
o=0x555557124140 <dpy>) at ../sources/qemu-11.0.0/ui/sdl2.c:957
#15 0x0000555555b2938f in qemu_init_displays () at
../sources/qemu-11.0.0/system/vl.c:2689
#16 qemu_init (argc=<optimized out>, argv=<optimized out>) at
../sources/qemu-11.0.0/system/vl.c:3847
#17 0x0000555555892529 in main (argc=<optimized out>, argv=<optimized
out>) at ../sources/qemu-11.0.0/system/main.c:71
To me it seems like forcing EGL triggers those wayland code paths
where the crash happens.
Alex
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