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Date: Thu, 31 Mar 2011 17:10:50 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Svatopluk Kraus <onwahe@gmail.com>
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Cc: freebsd-current@FreeBSD.org
Subject: Re: schedcpu() in /sys/kern/sched_4bsd.c calls thread_lock() on
 thread with un-initialized td_lock
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on 31/03/2011 14:32 Svatopluk Kraus said the following:
> Hi,
> 
>   I've got a page fault (because of NULL td_lock) in
> thread_lock_flags() called from schedcpu() in /sys/kern/sched_4bsd.c
> file. During process fork, new thread is linked to new process which
> is linked to allproc list and both allproc_lock and new process lock
> are unlocked before sched_fork() is called, where new thread td_lock
> is initialized. Only PRS_NEW process status is on sentry but not
> checked in schedcpu().

How recent is your current?
This sounds like something that could have been recently fixed.

-- 
Andriy Gapon