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Date: Thu, 5 Jan 2006 13:57:19 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
To: dsh@vlink.ru
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Cc: freebsd-stable@FreeBSD.org
Subject: Re: Recurring problem: processes block accessing UFS file system
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On  5 Jan, Denis Shaposhnikov wrote:
>>>>>> "Don" == Don Lewis <truckman@FreeBSD.org> writes:
> 
>  Don> Are you using any unusual file systems, such as nullfs or
>  Don> unionfs?
> 
> Yes, I'm use a lots of nullfs. This is a host system for about 20
> jails with nullfs mounted ro system:

That would be my guess as to the cause of the problem. Hopefully
DEBUG_VFS_LOCKS will help pinpoint the bug.