[Bug 283426] panic in sbappendaddr_locked()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283426

            Bug ID: 283426
           Summary: panic in sbappendaddr_locked()
           Product: Base System
           Version: 14.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: robin.haberkorn@googlemail.com

Created attachment 255963
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=255963&action=edit
Log files from /var/crash and lspci

I had two similar kernel panics in 4 days. It's apparently caused by or
triggered by the processing of incoming UDP packets. The source(?) port appears
to have been 43780 in both cases.

Looking through the backtrace, I cannot easily explain this.

# uname -a
FreeBSD thinkpad-x270 14.2-RELEASE FreeBSD 14.2-RELEASE
releng/14.2-n269506-c8918d6c7412 GENERIC amd64

This bug never ever happened on 14.1, pointing to a regression.

I attached `lspci -vvxxx` as well. The network driver is em(4).
Next, I will try intel-em-kmod.

Since I219-LM is not a particularly rare adapter, I assume this might affect
many people.

I have the vmcore files as well, but they are large (around 2GB), so I will
upload them somewhere only on request.

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