[Bug 291249] kgssapi panic at module unload (panic: __rw_wlock_hard: recursing but non-recursive rw 0xffffffff81cd6e60 @ /.../sys/rpc/clnt_nl.c:467)

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 27 Nov 2025 16:16:50 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291249

            Bug ID: 291249
           Summary: kgssapi panic at module unload (panic:
                    __rw_wlock_hard: recursing but non-recursive rw
                    0xffffffff81cd6e60 @ /.../sys/rpc/clnt_nl.c:467)
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: emaste@freebsd.org

On a WIP branch from main as of today, 4e22cd3bf0b4112e541bc585a6be57662cb0b52b
To reproduce, `kldload kgssapi.ko && kldunload kgssapi.ko`

panic: __rw_wlock_hard: recursing but non-recursive rw 0xffffffff81cd6e60 @
/home/emaste/src/freebsd-git/wipbsd/sys/rpc/clnt_nl.c:467

cpuid = 0
time = 1764260052
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe004ad98a80
vpanic() at vpanic+0x136/frame 0xfffffe004ad98bb0
panic() at panic+0x43/frame 0xfffffe004ad98c10
__rw_wlock_hard() at __rw_wlock_hard+0x7c7/frame 0xfffffe004ad98cb0
_rw_wlock_cookie() at _rw_wlock_cookie+0xac/frame 0xfffffe004ad98cf0
clnt_nl_destroy() at clnt_nl_destroy+0x199/frame 0xfffffe004ad98d10
kgssapi_modevent() at kgssapi_modevent+0x2c8/frame 0xfffffe004ad98d50
module_unload() at module_unload+0x38/frame 0xfffffe004ad98d70
linker_file_unload() at linker_file_unload+0x22b/frame 0xfffffe004ad98dc0
kern_kldunload() at kern_kldunload+0x190/frame 0xfffffe004ad98e00
amd64_syscall() at amd64_syscall+0x174/frame 0xfffffe004ad98f30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe004ad98f30

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