Xwayland: !1570 breaks screen sharing in Chromium and Electron-based applications
Attempting to share a window in Chromium will often cause Xwayland to crash. This causes issues for me because Electron-based applications like Discord use Chromium's screen sharing mechanism (and the PipeWire path, WebRTCPipeWireCapturer, doesn't work in Discord). Reverting !1570 (merged) resolves the problem.
The stack trace always looks similar to this:
Stack trace of thread 198998:
#0 0x00007699d4d6e3f4 n/a (libc.so.6 + 0x963f4)
#1 0x00007699d4d15120 raise (libc.so.6 + 0x3d120)
#2 0x00007699d4cfc4c3 abort (libc.so.6 + 0x244c3)
#3 0x000056d1fc056b4a OsAbort (Xwayland + 0x1d2b4a)
#4 0x000056d1fc05b8d3 AbortServer (Xwayland + 0x1d78d3)
#5 0x000056d1fc05c909 FatalError (Xwayland + 0x1d8909)
#6 0x000056d1fc053f45 OsSigHandler (Xwayland + 0x1cff45)
#7 0x00007699d4d151d0 n/a (libc.so.6 + 0x3d1d0)
#8 0x000056d1fbf5c636 RegionNull (Xwayland + 0xd8636)
#9 0x000056d1fbfb0058 compHandleMarkedWindows (Xwayland + 0x12c058)
#10 0x000056d1fbfb1d49 FreeCompositeClientWindow (Xwayland + 0x12dd49)
#11 0x000056d1fbfa294d doFreeResource (Xwayland + 0x11e94d)
#12 0x000056d1fbfa34a1 FreeResource (Xwayland + 0x11f4a1)
#13 0x000056d1fbfb0632 compUnredirectWindow (Xwayland + 0x12c632)
#14 0x000056d1fbf0a66d unredirect_window (Xwayland + 0x8666d)
#15 0x000056d1fc04d116 DoTimer (Xwayland + 0x1c9116)
#16 0x000056d1fc04d368 DoTimers (Xwayland + 0x1c9368)
#17 0x000056d1fbf7b201 Dispatch (Xwayland + 0xf7201)
#18 0x000056d1fbf7f353 dix_main (Xwayland + 0xfb353)
#19 0x00007699d4cfde08 n/a (libc.so.6 + 0x25e08)
#20 0x00007699d4cfdecc __libc_start_main (libc.so.6 + 0x25ecc)
#21 0x000056d1fbf025a5 _start (Xwayland + 0x7e5a5)Minimal steps to reproduce:
- Run
glxgears -fullscreen -swapinterval 0 - Run Chromium with
XDG_SESSION_TYPE=x11 chromium - Navigate to https://webrtc.github.io/samples/src/content/getusermedia/getdisplaymedia and attempt to share the glxgears window
- Xwayland will crash most of the time, usually when glxgears receives or loses focus
I'm using KDE Plasma 6.1 and AMD with mesa-git, so explicit sync should be active and might be involved. The latest stable Xwayland build is not affected.