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Re: [Xen-devel] Re: system freeze when processor.ko is loaded during boo

To: Martin Wilck <mwilck@xxxxxxxx>
Subject: Re: [Xen-devel] Re: system freeze when processor.ko is loaded during boot
From: Haitao Shan <maillists.shan@xxxxxxxxx>
Date: Thu, 31 Mar 2011 14:23:24 +0800
Cc: "Liu, Jinsong" <jinsong.liu@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, "Dugger, Donald D" <donald.d.dugger@xxxxxxxxx>, "Li, Xin" <xin.li@xxxxxxxxx>, "Wei, Gang" <gang.wei@xxxxxxxxx>
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Hi, Martin,
I have checked your dump info via debug key. I saw that the EIPs remained the same between two successive dump. However, without the symbols I could not identify which code kernel was hanging on. Is it possible that you can find this information by disassembling the kernel binaries (with symbols). Or could you please repeat your test using an upstreaming Xen and kernel so that I could compile a same kernel just as you would be using?
And I see you CPU is a very old model, UP without 64 bit support and no PAE? Right?
Shan Haitao

2011/3/29 Martin Wilck <mwilck@xxxxxxxx>
Hi Liu,

> Any update? I need reproduce the bug so your environment/config is really needed.

I think I have some news, finally. I got a docking station and a serial
cable and was finally able to capture some more debug output. You were
right, the hypervisor seems top be still alive (but timers seen to be
stalled). When the problem occurs, I see

(XEN) Platform timer appears to have unexpectedly wrapped 10 or more times.

This has been reported elsewhere, but I haven't seen anyone reporting a
total freeze in this case, like me.

I am attaching a serial capure. When the problem occured, I switched the
serial port to the hypervisor and ran some diagnostics. Hints
appreciated. This was done with the hypervisor and kernel of OpenSUSE 11.4.


> BTW, have you tried at some other platform beside Samsung XS50 laptop? is it a machine specific issue?

I haven't seen it on any other machine. But I don't have a
representative set of machines, either.


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