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

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Date:	Mon, 28 Mar 2011 10:58:53 -0400
From:	Sean Noonan <Sean.Noonan@...sigma.com>
To:	'Michel Lespinasse' <walken@...gle.com>,
	Christoph Hellwig <hch@...radead.org>
CC:	"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

> 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

Sean
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