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

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] [xen-4.0.1-rc5-pre] [pvops] Complete freeze within 2 days, no info in serial log
From: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Date: Tue, 3 Aug 2010 19:18:12 +0200
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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Hi Jeremy,

The last kernel that worked is quite hard to say, since the xhci patches depend 
on a 2.6.35-rc6 kernel, so i took that one from Konrad's tree.
But those pciback changes make it so i have to use a recent dom0 kernel as well 
(if i recall correct form some spinlock cleanups to work).


Tuesday, August 3, 2010, 5:51:26 PM, you wrote:

>   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.

>>> Symptoms:
>>> - 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?

>      J

Best regards,
 Sander                            mailto:linux@xxxxxxxxxxxxxx

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