linux-kernel - Re: XFS memory allocation deadlock in 2.6.38

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Message-ID: <BANLkTin0jJevStg5P2hqsLbqMzo3o30sYg@mail.gmail.com>
Date:	Mon, 28 Mar 2011 14:06:25 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	Sean Noonan <Sean.Noonan@...sigma.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Martin Bligh <Martin.Bligh@...sigma.com>,
	Trammell Hudson <Trammell.Hudson@...sigma.com>,
	Christos Zoulas <Christos.Zoulas@...sigma.com>,
	"linux-xfs@....sgi.com" <linux-xfs@....sgi.com>,
	Stephen Degler <Stephen.Degler@...sigma.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: XFS memory allocation deadlock in 2.6.38

On Mon, Mar 28, 2011 at 7:58 AM, Sean Noonan <Sean.Noonan@...sigma.com> wrote:
>> Regarding the deadlock: I am curious to see if it could be made to
>> happen before 5ecfda041e4b4bd858d25bbf5a16c2a6c06d7272. Could you test
>> what happens if you remove the MAP_POPULATE flag from your mmap call,
>> and instead read all pages from userspace right after the mmap ? I
>> expect you would then be able to trigger the deadlock before
>> 5ecfda041e4b4bd858d25bbf5a16c2a6c06d7272.
>
> I still see the deadlock without MAP_POPULATE

Could you test if you see the deadlock before
5ecfda041e4b4bd858d25bbf5a16c2a6c06d7272 without MAP_POPULATE ?

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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