leafpad crashing under labwc 0.7.0 (segfault?) about labwc

[ahesford]

I cannot reproduce this using leafpad in a nested session or urxvt in a standalone session on the console. In both cases, I can launch labwc 0.7.0 (as packaged on Void Linux) or a build of the current master branch.

[Consolatis]

There seems to be something going on with wlroots 0.17 and virtualized GPU drivers.
Maybe some env vars from https://gitlab.freedesktop.org/wlroots/wlroots/-/blob/master/docs/env_vars.md may help?

E.g. WLR_EGL_NO_MODIFIERS=1 and / or WLR_DRM_NO_MODIFIERS=1 and / or WLR_DRM_NO_ATOMIC=1.
You could also try to use software rendering via WLR_RENDERER=pixman.

Edit:
A backtrace would also be useful, for example gdb --args labwc -d -s leafpad, r, bt.

[ludg1e]

By setting WLR_EGL_NO_MODIFIERS=1, WLR_DRM_NO_MODIFIERS=1 and WLR_DRM_NO_ATOMIC=1 in .config/labwc/environment here's the log
It's a 20MB log, kinda crazy though: https://fromsmash.com/labwc-14xx

With the env vars from before plus WLR_RENDERER=pixman the VM freezes and I need to reset it from VBox settings

Running gdb --args labwc -d -s leafpad, r, bt it says no debugging symbols found in labwc

[stefonarch]

As said here on labwc 0.7.0-59-g417fa21 with AMD Gpu same with xterm, no backtrace, while no issue with leafpad. Xterm opens a fraction of seconds.

EDIT: weird, I added again systemd-cat --identifier=labwc in my startup script and restarted the session, and xterm opens fine now, just complaining:
xterm: cannot load font "-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1"

[ludg1e]

Seems to be happening on all virtual guests (VMware too). Already reported by @tranzystorekk on wlroots (https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3788)
This issue didn't happen on labwc 0.6.6, so it could be either a labwc 0.7 issue or an upstream wlroots 0.17 issue

Related: #1361

Edit: can confirm it could highly be wlroots as when running wlroots 0.16 compositor (sway 1.8.1; wlroots 0.16), xterm and leafpad work correctly with no issues

[johanmalm]

@ludg1e If you bulid with commans below you'll get debug symbols for both labwc+wlroots. It also enables ASAN which means you get a backtrace on crash.

meson setup --force-fallback-for=wlroots build/
meson configure -Db_sanitize=address,undefined build/
meson compile -C build/

If you then run with ./build/labwc 2>log.txt and provide that here (or possibly even better - on the wlroots issue) that might help solve it.

[ludg1e]

@johanmalm done what you've said, now labwc doesn't crash, and leafpad just throws an error on the term (1)

Though, the log is 50 MB... https://fromsmash.com/labwc-bigga-log
1

Edit: chromium xwayland and xterm also crash now too