linux-kernel - Re: 2.6.24 regression: pan hanging unkilleable and un-straceable

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Message-Id: <200801231000.30020.nickpiggin@yahoo.com.au>
Date:	Wed, 23 Jan 2008 10:00:29 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Frederik Himpe <fhimpe@...enet.be>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.24 regression: pan hanging unkilleable and un-straceable

On Tuesday 22 January 2008 21:37, Ingo Molnar wrote:
> * Nick Piggin <nickpiggin@...oo.com.au> wrote:
> > Well I've twice tried to submit a patch to print stacks for running
> > tasks as well, but nobody seems interested. It would at least give a
> > chance to see something.
>
> i definitely remembering having done this myself a couple of times (it
> makes tons of sense to get _some_ info out of the system) but some
> problem in -mm kept reverting it. I dont remember the specifics ... it
> was some race.

Hmm, that's not unlikely. But there is nothing in the backtrace code
which prevents a task from being woken up anyway, is there? I guess
it will be more common now, but if we find a race we can try to fix
the root cause.
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