chromium: illegal instruction crash when trying to screen share on wayland+pipewire system

[thenhnn]

Nixpkgs version

• Unstable (25.05)

Describe the bug

Trying to screen share on Wayland leads to illegal instruction inside Chromium binary.

Illegal instruction occurs in 0x000000010a131dd5 in webrtc::SharedScreenCastStreamPrivate::StartScreenCastStream(unsigned int, int, unsigned int, unsigned int, bool, webrtc::DesktopCapturer::Callback*) ().

Disassembly:

(gdb) x/i $pc
=> 0x10a131dd5 <_ZN6webrtc29SharedScreenCastStreamPrivate21StartScreenCastStreamEjijjbPNS_15DesktopCapturer8CallbackE+805>:	ud1    0x2(%eax),%eax
(gdb) disassemble $pc-10, $pc+10
Dump of assembler code from 0x10a131dcb to 0x10a131ddf:
   0x000000010a131dcb <_ZN6webrtc29SharedScreenCastStreamPrivate21StartScreenCastStreamEjijjbPNS_15DesktopCapturer8CallbackE+795>:	shlb   $0x83,0x48(%rcx,%riz,2)
   0x000000010a131dd0 <_ZN6webrtc29SharedScreenCastStreamPrivate21StartScreenCastStreamEjijjbPNS_15DesktopCapturer8CallbackE+800>:	js     0x10a131dda <_ZN6webrtc29SharedScreenCastStreamPrivate21StartScreenCastStreamEjijjbPNS_15DesktopCapturer8CallbackE+810>
   0x000000010a131dd2 <_ZN6webrtc29SharedScreenCastStreamPrivate21StartScreenCastStreamEjijjbPNS_15DesktopCapturer8CallbackE+802>:	add    %dh,0x67(%rdx,%rbx,2)
   0x000000010a131dd6 <_ZN6webrtc29SharedScreenCastStreamPrivate21StartScreenCastStreamEjijjbPNS_15DesktopCapturer8CallbackE+806>:	ud1    0x2(%rax),%eax
   0x000000010a131dda <_ZN6webrtc29SharedScreenCastStreamPrivate21StartScreenCastStreamEjijjbPNS_15DesktopCapturer8CallbackE+810>:	movq   $0x0,(%rsp)

Steps to reproduce

1. chromium --user-data-dir=/tmp/chromium-screen-share-crash 'https://mozilla.github.io/webrtc-landing/gum_test.html'
2. click share screen
3. select target using portal ui
4. expect crash

Expected behaviour

Screen sharing works

Screenshots

No response

Relevant log output

Additional context

• Arch Linux forum post: https://bbs.archlinux.org/viewtopic.php?id=304158
• Can be reproduced on both chromium and ungoogled-chromium
• Happens only on x86_64-linux. Works fine on aarch64-linux.
• google-chrome doesn't crash.

System metadata

• system: "x86_64-linux"
• host os: Linux 6.12.17-hardened1, NixOS, 25.05 (Warbler), 25.05.20250314.bd9298a
• multi-user?: no
• sandbox: yes
• version: nix-env (Lix, like Nix) 2.93.0-dev-pre20250316-29732f1

Notify maintainers

@networkException @emilylange

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[s0me1newithhand7s]

reproducible; on both chromuim and ungoogled-chromuim, but not on google-chrome;

[eclairevoyant]

Which compositor? "Wayland" is too vague.

[thenhnn]

Which compositor? "Wayland" is too vague.

I think, it doesn't matter as the issue is in chromium+pipewire communication. (My guess is that crash happens somewhere there: wayland/shared_screencast_stream.cc)

@s0me1newithhand7s reproduced it on Hyprland, I am using niri.

Screen sharing works on aarch64 with niri. Chromium binary contains invalid machine code only on x86_64.

[s0me1newithhand7s]

@s0me1newithhand7s reproduced it on Hyprland, I am using niri.

hyprland and river, since my laptop and my PC have different WMs; and yes - same problem

[s0me1newithhand7s]

hyprland and river, since my laptop and my PC have different WMs; and yes - same problem

UPD:
sway, swayfx, wayfire - same