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Date: Mon, 25 Jan 2010 10:00:14 GMT
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To: freebsd-fs@FreeBSD.org
From: Peter Jeremy <peterjeremy@acm.org>
Cc: 
Subject: Re: kern/143184: [zfs] [lor] zfs/bufwait LOR
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The following reply was made to PR kern/143184; it has been noted by GNATS.

From: Peter Jeremy <peterjeremy@acm.org>
To: FreeBSD-gnats-submit@FreeBSD.org, freebsd-bugs@FreeBSD.org
Cc:  
Subject: Re: kern/143184: [zfs] [lor] zfs/bufwait LOR
Date: Mon, 25 Jan 2010 20:51:40 +1100

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 Archive followup in -stable:
 
 On 2010-Jan-25 11:24:11 +0200, Kostik Belousov <kostikbel@gmail.com> wrote:
 >On Mon, Jan 25, 2010 at 07:07:00PM +1100, Peter Jeremy wrote:
 >> I had the following crop up recently in 8-STABLE/amd64 from end of
 >> November.  It's been reported as kern/143184.
 >Basically, page containing the buffer for read(2) is swapped out.
 >This causes page fault in copyout(9) and entry into vm subsystem
 >while zfs vnode lock is held.
 >
 >If the buffer is backed by e.g. UFS vnode instead of anonymous
 >memory, you would get UFS/zfs LOR.
 >
 >The problem is generic, I am working on the solution in collaboration
 >with Peter Holm, basing on the Jeff Roberson idea.
 
 --=20
 Peter Jeremy
 
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