linux-kernel - Re: [PATCH] mm: fix possible cause of a page

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Message-ID: <BANLkTiniyAN40p0q+2wxWsRZ5PJFn9zE0Q@mail.gmail.com>
Date:	Tue, 12 Apr 2011 07:21:20 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Robert Święcki <robert@...ecki.net>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Miklos Szeredi <miklos@...redi.hu>,
	Michel Lespinasse <walken@...gle.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH] mm: fix possible cause of a page_mapped BUG

On Tue, Apr 12, 2011 at 2:58 AM, Robert Święcki <robert@...ecki.net> wrote:
>
> So, if this case is not caught later on in the code, I guess it solves
> the problem. During the fuzzing I didn't experience any panic's, but
> some other problems arose, i.e. cannot read /proc/<pid>/maps for some
> processes (sys_read hangs, and such process cannot be killed or
> stopped with any signal, still it's running (R state) and using CPU -
> I'll submit another report for that).

Hmm. Sounds like an endless loop in kernel mode.

Use "perf record -ag" as root, it should show up very clearly in the report.

                          Linus
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