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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 12 Apr 2011 07:21:20 -0700
Message-ID: <BANLkTiniyAN40p0q+2wxWsRZ5PJFn9zE0Q@mail.gmail.com>
Subject: Re: [PATCH] mm: fix possible cause of a page_mapped BUG
To: =?UTF-8?B?Um9iZXJ0IMWad2nEmWNraQ==?= <robert@swiecki.net>
Cc: Hugh Dickins <hughd@google.com>, Andrew Morton <akpm@linux-foundation.org>,
        Miklos Szeredi <miklos@szeredi.hu>,
        Michel Lespinasse <walken@google.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Rik van Riel <riel@redhat.com>
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On Tue, Apr 12, 2011 at 2:58 AM, Robert Święcki <robert@swiecki.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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