Re: [Xenomai-help] BUG fs/buffer.c with Linux 2.6.26,27

[Jan Kiszka <jan.kiszka@domain.hid>]

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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 Xenomai
> 2.4.6.1 works without problem. So this is solution for now.
> 
> Tested on x86 - thinkpad laptop and pentium 4 desktop.
> 
> 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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