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Re: [Xen-devel] [xen-4.0.1-rc5-pre] [pvops] Complete freeze wi

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] [xen-4.0.1-rc5-pre] [pvops] Complete freeze within 2 days, no info in serial log
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 03 Aug 2010 08:51:26 -0700
Cc: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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 On 08/03/2010 08:45 AM, Konrad Rzeszutek Wilk wrote:
On Tue, Aug 03, 2010 at 05:30:57PM +0200, Sander Eikelenboom wrote:
Hi All,

I'm experiencing for what it seems a random freeze with current 
xen-4.0-testing, pvops dom0 kernel, most of the time within 2 days 
after rebooting.

You did not experience the freeze with

There have been a few updates to the .32.16 kernel too (and now its .17...). But it would be very useful to identify which the last working kernel was.

- Complete freeze, only power cycle does work.
- No bug output/stacktrace in serial log / on screen.
- Not able to get into hypervisor with ctrl-a (doesn't react to keyboard)
- No info in syslog.

Are there any more boot options I could give a try in the hope it will give 
some debug output ?
The Linux kernel has some of those 'DETECT_SPINLOCK_HANG' or
'DETECT_WORK..something' flags. It might be a good idea to compile those
and see when your machine freezes if after 2 minutes the kernel starts
spitting out what is hung. That could give some idea.

If Xen doesn't respond then it isn't a kernel spinlock problem; it looks more system-wide than that. I notice the kernel command line has lots of hidden PCI devices. Sander, is there any particular activity (esp passthrough device activity) which might correspond to the hang?


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