XWayland processes lingering after session terminates

[me-teorick]

At the end of a streaming session, all processes related to the session exit except one.
It looks like this:
Xwayland :0 -verbose -rootless -terminate -wm 78 -displayfd 85 -listenfd 82 -listenfd 83

The ":0" increments, thus after n sessions we have "Xwayland :1", "Xwayland :2", ... "Xwayland :n" processes.
Each of those processes consumes some RAM and VRAM (see nvtop listing in image below)

[me-teorick]

It would seem this is a Smithay issue: Smithay/smithay#1210

[me-teorick]

Since that Smithay issue has been open for 2.5 years, I guess it won't be fixed anytime soon.
I can submit a PR with some workaround code that identifies these zombie Xwayland processes and SIGTERM/SIGKILLS them at the end of the streaming session. It's the best I could come up with. But probably you want a cleaner solution. Let me know.

[hgaiser]

This unfortunately seems to still be an issue, even in upstream smithay. Not sure it is something we should fix in moonshine, sounds like an upstream issue.

[me-teorick]

Yes, probably not. Just in case it helps anyone else, I created #115 with the workaround fix which terminates orphaned XWayland processes on session shutdown. I'll be patching my moonshine locally with it.