[Bug 231428] 12.0-ALPHA6 crashes with gif (IPv4 in IPv4) over vtnet

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231428

--- Comment #4 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Matthew Macy from comment #3)
> I think the assertion is generally useful. Andrey - is there any way to
> infer that we're in encap context? In which case we could just set
> TI_RLOCKED to true and everything would work.

I think currently there is no way to infer that we are in encap context.
The call path is like this:

ip_input()
  encap_input()
    gif_input()
      netisr_dispatch()
        ip_input()
          tcp_input()

Starting from encap_input we are in encap context.

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