[Bug 293127] Kernel panic __mtx_lock_sleep due to nfsd?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293127

--- Comment #3 from Rick Macklem <rmacklem@FreeBSD.org> ---
(In reply to Mark Johnston from comment #2)
Yep. Looks the same to me.
So Gleb, do you use bridge and/or epair on
the system that crashes.

If you look at 292884, you'll see that something
is deref'ng the socket prematurely.
This appears to have shown up in 15.0.

You can try the patch, which acquires an extra
reference on the socket. (It shouldn't be necessary,
but unless someone can figure out what is deref'ng the
socket, it should be an adequate workaround.)

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