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From: Robert Watson <rwatson@FreeBSD.org>
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To: Tillman Hodgson <tillman@seekingfire.com>
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Cc: andre@FreeBSD.org, current@freebsd.org
Subject: Re: Panic on boot with April 16 src (lengthy info attached)
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On Tue, 17 Apr 2007, Tillman Hodgson wrote:

> Tue Apr 17 08:57:17 CST 2007
>
> FreeBSD/i386 (athena.seekingfire.prv) (ttyd0)
>
> login: panic: mutex Giant not owned at /usr/src/sys/netinet/tcp_timer.c:286
> cpuid = 0
> KDB: enter: panic
> [thread pid 13 tid 100003 ]
> Stopped at      kdb_enter+0x2b: nop
> db>

There's quite a bit of stuff in here, but I can speak to this one: Andre's 
recent TCP timer change causes TCP to run without Giant when 
debug.mpsafenet=0.  This leads to panics with INVARIANTS, and non-MPSAFE code 
running without Giant otherwise.

Robert N M Watson
Computer Laboratory
University of Cambridge