[arch-general] Xorg segfault when using electron application and second monitor

[LuKaRo]

Hi everyone,

since yesterday's update, my Xorg crashes with a segmentation fault as
soon as I start an electron application and have a second monitor
activated. This is reproducible, a minimum working example looks like this:

$ rocketchat-desktop
$ xrandr --output DP-1-1 --auto --above eDP-1 --rotate normal
$ rocketchat-desktop --disable-gpu
$ rocketchat-desktop

Starting rocketchat-desktop before activating the external screen works
without error, as does starting rocketchat-desktop without GPU
acceleration after activating the external screen. However, as soon as I
start rocketchat-desktop normally (e.g. with GPU acceleration) Xorg
immediately crashes, tty1 appears for a moment, and then my
lightdm-gtk-greeter returns, allowing me to log in again. The same thing
happens for example with signal-desktop or element-desktop. An example
Xorg.log ends like this:

[ 16805.080] (II) modeset(0): Allocate new frame buffer 1920x2160 stride
[ 16805.230] (II) NVIDIA(G0): Setting mode "DP-1-1: nvidia-auto-select
@1920x1080 +0+0 {AllowGSYNC=Off, ViewPortIn=1920x1080,
ViewPortOut=1920x1080+0+0}"
[ 16808.392] (EE)
[ 16808.392] (EE) Backtrace:
[ 16808.392] (EE) 0: /usr/lib/Xorg (xorg_backtrace+0x5b) [0x55c4bab6457b]
[ 16808.392] (EE) 1: /usr/lib/Xorg (0x55c4baa1e000+0x1511d5)
[0x55c4bab6f1d5]
[ 16808.392] (EE) 2: /usr/lib/libc.so.6 (0x7f8962b82000+0x3cda0)
[0x7f8962bbeda0]
[ 16808.392] (EE) 3: /usr/lib/Xorg (0x55c4baa1e000+0xd81f2) [0x55c4baaf61f2]
[ 16808.392] (EE) 4: /usr/lib/Xorg (0x55c4baa1e000+0xd9d1c) [0x55c4baaf7d1c]
[ 16808.392] (EE) 5: /usr/lib/Xorg (0x55c4baa1e000+0xd8dc6) [0x55c4baaf6dc6]
[ 16808.392] (EE) 6: /usr/lib/Xorg (0x55c4baa1e000+0x398ac) [0x55c4baa578ac]
[ 16808.392] (EE) 7: /usr/lib/libc.so.6 (__libc_start_main+0xd5)
[0x7f8962ba9b25]
[ 16808.392] (EE) 8: /usr/lib/Xorg (_start+0x2e) [0x55c4baa57cee]
[ 16808.392] (EE)
[ 16808.392] (EE) Segmentation fault at address 0x68
[ 16808.393] (EE)
Fatal server error:
[ 16808.393] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 16808.393] (EE)
[ 16808.393] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[ 16808.393] (EE) Please also check the log file at
"/var/log/Xorg.0.log" for additional information.
[ 16808.393] (EE)
[ 16808.393] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 16808.450] (EE) Server terminated with error (1). Closing log file.

Hardware is a Lenovo ThinkPad P53 notebook with dual graphics:

$ lspci|grep -i vga
00:02.0 VGA compatible controller: Intel Corporation CoffeeLake-H GT2
[UHD Graphics 630]
01:00.0 VGA compatible controller: NVIDIA Corporation TU117GLM [Quadro
T1000 Mobile] (rev a1)

Kernel is the latest Linux:

$ uname -a
Linux 5.12.15-arch1-1 #1 SMP PREEMPT Wed, 07 Jul 2021 23:35:29 +0000
x86_64 GNU/Linux

And I'm using the NVIDIA driver:

$ pacman -Qe|grep nvidia
nvidia 465.31-14
nvidia-lts 1:465.31-12
nvidia-prime 1.0-4
nvidia-settings 465.31-1

I also downgraded to the earliest kernel and nvidia versions I had
available from late May:

[2021-07-12T18:25:56+0200] [ALPM] downgraded linux-lts (5.10.42-1 ->
5.10.39-1)
[2021-07-12T18:25:59+0200] [ALPM] downgraded linux-lts-headers
(5.10.42-1 -> 5.10.39-1)
[2021-07-12T18:26:00+0200] [ALPM] downgraded linux (5.12.9.arch1-1 ->
5.12.6.arch1-1)
[2021-07-12T18:26:02+0200] [ALPM] downgraded linux-headers
(5.12.9.arch1-1 -> 5.12.6.arch1-1)
[2021-07-12T18:26:03+0200] [ALPM] downgraded linux-hardened
(5.12.14.hardened1-1 -> 5.11.22.hardened1-1)
[2021-07-12T18:26:06+0200] [ALPM] downgraded linux-hardened-headers
(5.12.14.hardened1-1 -> 5.11.22.hardened1-1)
[2021-07-12T18:26:06+0200] [ALPM] downgraded nvidia-lts (1:465.31-7 ->
1:465.31-3)
[2021-07-12T18:26:06+0200] [ALPM] downgraded nvidia (465.31-7 -> 465.31-4)

However, the issue still persits. Any ideas on how to further diagnose
this issue? I can provide more information, if needed. I'll try
switching Also, is anyone having a similar issue?

Kind regards,

Lukas