From owner-freebsd-current@FreeBSD.ORG  Mon Feb 13 08:14:48 2006
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Date: Mon, 13 Feb 2006 10:14:26 +0200
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Gleb Smirnoff <glebius@FreeBSD.org>
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Cc: freebsd-current@FreeBSD.org
Subject: Re: insta-panic in softclock() -> acctwatch()
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On 2006-02-13 11:08, Gleb Smirnoff <glebius@FreeBSD.org> wrote:
> On Mon, Feb 13, 2006 at 01:36:36AM +0200, Giorgos Keramidas wrote:
> G> I've finally managed to catch one of the panics of a 2006.01.25 kernel
> G> in action, while working on the console.  Unfortunately, not with a
> G> debugging kernel, but the function backtrace was:
> G>
> G>     panic()
> G>     sleepq_add()
> G>     cv_wait_unlock()
> G>     cv_wait()
> G>     _sx_xlock()
> G>     acctwatch()
> G>     softclock()
> G>
> G> This went away after I disabled process accounting in `rc.conf', but it
> G> may help someone more experienced with process accounting to find a
> G> better fix :)
>
> AFAIK, John has fixed this recently. Check whether you have last revision
> of kern_acct.c

Thanks :)

I quite probably don't.  I haven't been able to use a recent HEAD build
since around January 20, but I'm rebuilding since half an hour ago.