http://bugzilla.kernel.org/show_bug.cgi?id=13087





--- Comment #26 from Daniel Vetter <dan...@ffwll.ch>  2009-04-18 11:26:46 ---
On Fri, Apr 17, 2009 at 04:05:53AM +0000, bugzilla-dae...@bugzilla.kernel.org
wrote:
> --- Comment #25 from ykzhao <yakui.z...@intel.com>  2009-04-17 04:05:52 ---
> Created an attachment (id=21022)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=21022)
>  --> (http://bugzilla.kernel.org/attachment.cgi?id=21022)
> [debug patch]: print which clocksource is used.
> 
> Will you please try the debug patch and boot the system with/without the boot
> option of "notsc"?
>     After the test, please attach the output log.
>     Thanks.

Hi ykzhao,

In the course of preparing the logs you requested, I encountered a very
strange effect. When I boot the machine with a usb-serial converter
plugged into one usb port, everything is fine and the machine doesn't
freeze. If I then unplug the usb-serial converter, the machine freezes
within a few seconds on a bad kernel. I've tested quite a few of the bad
kernel versions, all exhibiting the same behaviour. So I think it's
unlikely that this is an unrelated regression. Furthermore, on a kernel
where  ff69.. is reverted, this does not happen, too.

I hope this can help.

-Daniel

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