[Bug 293127] Kernel panic __mtx_lock_sleep due to nfsd?

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 28 Feb 2026 22:26:34 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293127

--- Comment #15 from Rick Macklem <rmacklem@FreeBSD.org> ---
Created attachment 268432
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=268432&action=edit
svc_dg.c: Take an additional refcnt for the socket

This patch does what the patch in PR#292884 does
for TCP sockets, except for UDP sockets.
I know you said that the patch in PR#292884 did
not stop the crashes, but at least one crash showed
a failure w.r.t. a UDP socket, so I am hoping that
this patch plus the one in PR#292884 will stop the
crashes?

If you can test with both this patch and the one in
PR#292884 applied, that would be appreciated.
(Setting nfs_server_flags="t" so it is not using any
UDP sockets should also have the same effect as this
patch, if I am correct in my assumption that this is
related to the sockets being sorele()'d prematurely.)

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