Re: Debugging stuck mount

["Morten Hein Tiljeset" <morten@tiljeset.com>]

> The file descriptor could already be closed but the task could be stuck
> exiting and so queued task work including destroying files wouldn't be
> done yet. You could also try and see if you can figure out what tasks
> require your workload to do a lazy umount in the first place. That might
> bring you closer to the root cause.
>
> What kernel version are you running anyway?
That's an interesting idea about the stuck task, I'll try looking into that. We're not
doing lazy unmounts on purpose -- I'm only concluding that it must be happening based on
the mount namespace being NULL. I wonder if the lazy unmount could happen implicitly
as a consequence of some other operation?

I'm on kernel 6.1.53 and I've also experienced the problem on the 5.15.x series.