Re: [PATCH] mm: fix possible cause of a page_mapped BUG

From: Linus Torvalds
Date: Tue Apr 12 2011 - 10:22:21 EST

On Tue, Apr 12, 2011 at 2:58 AM, Robert ÅwiÄcki <robert@xxxxxxxxxxx> 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.

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