Addendum:

   I have only installed the new kernel, userland is still from dec18.

(Even if that is the cause, we should not panic on bad syscall args.)

Poul-Henning Kamp writes:
> With fresh current:
>
>       commit e179d9739b1438ae9acb958f80a983eff7e3dce9
>       Author: Michael Tuexen <tue...@freebsd.org>
>       Date:   Sat Jan 6 21:31:46 2024 +0100
>
>           tcpsso: support TIME_WAIT state
>     
> I get an insta-panic as soon as any network interface comes up:
>
>       --- trap 0xc, rip = 0xffff...f80d97b78, rsp = 0x...
>       nl_send_one() at nl_send_one+0x18/frame 0xf....
>       nl_send_group() at nl_send_group+0x1bc/frame 0xf...
>       _nlmsg_flush() at _nlmsg_flush+0x37/frame 0xf...
>       rtnl_handle_ifevent() + 0xa1
>       if_attach_internal + 0x3df
>
> I have a picture of the full panic if desired...
>
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> p...@freebsd.org         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
p...@freebsd.org         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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