[Bug 289734] panic tcp_usr_close while running mount command after configure NFS over TLS

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289734

--- Comment #28 from [email protected] ---
A commit in branch stable/15 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=f3b14134dec11c2f09980f25c4c60accbfea0f1e

commit f3b14134dec11c2f09980f25c4c60accbfea0f1e
Author:     Mark Johnston <[email protected]>
AuthorDate: 2026-06-15 15:52:24 +0000
Commit:     Mark Johnston <[email protected]>
CommitDate: 2026-06-22 13:26:09 +0000

    rpcsec_tls: Avoid a socket reference underflow in rpctls_server()

    The upcall_sockets tree owns a ref on any resident socket.  When a
    socket is removed after a TLS handshake failure, rpctls_rpc_failed()
    thus calls soclose().

    rpctls_server() does not acquire an extra ref to compensate for this.
    So, if the upcall fails, e.g., because rpc.tlsservd is not running,
    we'll call soclose() to drop the reference, but this effectively
    releases the xprt layer's reference.

    Fix the problem by explicitly acquiring a socket reference when adding
    a socket to the upcall tree.

    PR:             289734
    Reviewed by:    rmacklem, glebius
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D57555

    (cherry picked from commit fc7993cf2d6ddba9f94683565838bf8fabc0145c)

 sys/rpc/rpcsec_tls/rpctls_impl.c | 23 ++++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

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