From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 17 Feb 2009 23:50:29 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] BUG fs/buffer.c with Linux 2.6.26,27
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To: Roman Pisl <rpisl@domain.hid>
Cc: xenomai@xenomai.org

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Roman Pisl wrote:
> Hello,
> I'm porting our application to Xenomai and I found a bug with Linux
> 2.6.26 and 2.6.27 (and also .19) and Xenomai 2.4.6.1. This happens when=

> the application is running and there is hard disk activity. It happens
> also when latency test is running for a while. Linux 2.6.16 with Xenoma=
i
> 2.4.6.1 works without problem. So this is solution for now.
>=20
> Tested on x86 - thinkpad laptop and pentium 4 desktop.
>=20
> I'm not a kernel hacker but surely try to help with fixing. I'd like to=

> see this fixed.

/me, too. But could you first of all check if the problem persists even
with latest adeos-ipipe-2.6.27.13-x86-2.2-05.patch [1]?

If it does: Go back to 2.6.26 (in order to have the ipipe tracer).
Before the oops can occur, extend /proc/ipipe/trace/back_trace_points
to, say, one thousand ("echo 1000 > /proc/..."). Then post the resulting
trace. It may include some hints about when Linux IRQs were last enabled
and when they became stuck at disabled. Also, please attach your .config.=


Thanks,
Jan

[1] http://download.gna.org/adeos/patches/v2.6/x86/


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