[Bug 271344] page fault during assigning/removing IPv6 addresses simultaneously

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271344

            Bug ID: 271344
           Summary: page fault during assigning/removing IPv6 addresses
                    simultaneously
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pkubaj@FreeBSD.org

Created attachment 242098
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=242098&action=edit
panic

Reproduced on powerpc64 with bge and on amd64 with ice and bge.
Run the following command repeatedly:
for i in {1..20}; do ifconfig ice0 inet6 fec0::2:930/112 & ifconfig ice0 inet6
fec0::2:930 delete & done

It may take a few attempts, but will result in the attached panic (on amd64
with ice).

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