[Bug 254309] [tcp] frequent panics in tcp_output

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254309

Richard Scheffenegger <rscheff at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|net at FreeBSD.org             |rscheff at freebsd.org
             Status|New                         |In Progress

--- Comment #11 from Richard Scheffenegger <rscheff at freebsd.org> ---
See https://reviews.freebsd.org/D29315 

flags = 17 -> 0x11, 0x10 is TF_SENTFIN, TF_ACKNOW

and 6675pipe is enabled, enabling the new rescue-retransmission.

Further, this is stated to be a web server, where it is likely that http/1.0
tcp sessions are closed right after an object was sent, and if the very last
segment with the FIN is dropped by the network, the rescue retransmission code
tried to include the "data byte" of the FIN (which doesn't exist really, only
as the last octet in the sequence space stream).

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