From owner-freebsd-net@freebsd.org  Sun Dec 25 09:31:49 2016
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Subject: [Bug 215513] panic: SACK scoreboard must not be empty
Date: Sun, 25 Dec 2016 09:31:49 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215513

--- Comment #5 from Michael Tuexen <tuexen@freebsd.org> ---
By looking at your Details, your system is low on memory when the problem
occurs.
Can you just remove the KASSERT
http://fxr.watson.org/fxr/source/netinet/tcp_sack.c#L474
and retest?
I think if tcp_sackhole_insert in
http://fxr.watson.org/fxr/source/netinet/tcp_sack.c#L446
returns NULL due to memory shortage, you run into the KASSERT.

Best regards
Michael

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