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To: linux-kernel@vger.kernel.org
Subject: Fwd: Re: WCHAN wrong for i386-kernel
From: "Gerhard Kurz" <gerhard.kurz@gmx.at>
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Date: Sun, 01 Apr 2007 21:28:41 +0200
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------- Forwarded message -------
From: "Ingo Molnar" <mingo@elte.hu>
To: "Gerhard Kurz" <gerhard.kurz@gmx.at>
Cc:
Subject: Re: WCHAN wrong for i386-kernel
Date: Sun, 01 Apr 2007 20:30:49 +0200


* Gerhard Kurz <gerhard.kurz@gmx.at> wrote:

> Hi,
>
> There is a minor bug in kernels for i386 (i found it in 2.6.14.2, but
> looking at the source code of 2.6.20, it should be there also).
>
> Symptom: For a task that sleeps e.g. in sys_nanosleep, the wchan value
> from get_wchan (in arch/i386/kernel/process.c) is wrong.
>
> Reason: To get the correct wchan value, all __sched functions must
> have a framepointer. Currently only the functions in kernel/sched.c
> are compiled with -fno-omit-frame-pointer. (see kernel/Makefile)
>
> But sys_nanosleep calls schedule_timeout_interruptible (in
> kernel/timer.c), which doesn't have a framepointer.

ah, indeed - nice find!

could you please report this to lkml too? It should be fixed, and by
sending it to lkml we make it sure that someone picks it up eventually,
if i dont get around fixing it in time.

	Ingo