linux-kernel - Re: Oops in 3.7-rc8 isolate_free_pages

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Message-ID: <20121206172225.GA978@polaris.bitmath.org>
Date:	Thu, 6 Dec 2012 18:22:25 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Jan Kara <jack@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Oops in 3.7-rc8 isolate_free_pages_block()

> Still travelling and am not in a position to test this properly :(.
> However, this bug feels very similar to a bug in the migration scanner where
> a pfn_valid check is missed because the start is not aligned.  Henrik, when
> did this start happening? I would be a little surprised if it started between
> 3.6 and 3.7-rcX but maybe it's just easier to hit now for some reason. How
> reproducible is this? Is there anything in particular you do to trigger the
> oops? Does the following patch help any? It's only compile tested I'm afraid.

I managed to trigger the path several times with a small
memory-intensive program, and since I am still here,

    Tested-by: Henrik Rydberg <rydberg@...omail.se>

Thanks!
Henrik
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