Re: Kernel bug from 3.0 (was phy disks and vifs timing out in DomU)

From: "Pasi Kärkkäinen" <pasik@iki.fi>
To: Sander Eikelenboom <linux@eikelenboom.it>
Cc: Ian Campbell <Ian.Campbell@eu.citrix.com>,
	Todd Deshane <todd.deshane@xen.org>,
	"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
	Anthony Wright <anthony@overnetdata.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Kernel bug from 3.0 (was phy disks and vifs timing out in DomU)
Date: Fri, 26 Aug 2011 14:23:32 +0300	[thread overview]
Message-ID: <20110826112331.GC32373@reaktio.net> (raw)
In-Reply-To: <1598888077.20110826091056@eikelenboom.it>

On Fri, Aug 26, 2011 at 09:10:55AM +0200, Sander Eikelenboom wrote:
> Hello Anthony,
> 
> Perhaps you could try running with xend instead of the xl toolstack ?
> Since you have also changed the hypervisor version to 4.1.1, i think you were previously using xend instead of xl ?
> 
> So in theory it could also be a problem in the xl toolstack causing the extra qemu processes when building the domain.
> 

Are you using pvfb for the domU?
If yes, pvfb needs qemu-dm for the VNC server..

-- Pasi

> 
> Sander
> 
> Thursday, August 25, 2011, 11:11:44 PM, you wrote:
> 
> > On 19/08/2011 13:56, Konrad Rzeszutek Wilk wrote:
> >> On Fri, Aug 19, 2011 at 11:22:15AM +0100, Anthony Wright wrote:
> >>> On 03/08/2011 16:28, Konrad Rzeszutek Wilk wrote:
> >>>> On Fri, Jul 29, 2011 at 08:53:02AM +0100, Anthony Wright wrote:
> >>>>> I've just upgraded to xen 4.1.1 with a stock 3.0 kernel on dom0 (with
> >>>>> the vga-support patch backported). I can't get my DomU's to work due to
> >>>>> the phy disks and vifs timing out in DomU and looking through my logs
> >>>>> this morning I'm getting a consistent kernel bug report with xen
> >>>>> mentioned at the top of the stack trace and vifdisconnect mentioned on
> >>>> Yikes! Ian any ideas what to try?
> >>>>
> >>>> Anthony, can you compile the kernel with debug=y and when this happens
> >>>> see what 'xl dmesg' gives? Also there is also the 'xl debug-keys g' which
> >>>> should dump the grants in use.. that might help a bit.
> >>> I've compiled a 3.0.1 kernel with CONFIG_DEBUG=Y (a number of other
> >>> config values appeared at this point, and I took defaults for them).
> >>>
> >>> The output from /var/log/messages & 'xl dmesg' is attached. There was no
> >>> output from 'xl debug-keys g'.
> >> Ok, so I am hitting this too - I was hoping that the patch from Stefano
> >> would have fixed the issue, but sadly it did not.
> >>
> >> Let me (I am traveling right now) see if I can come up with an internim
> >> solution until Ian comes with the right fix.
> >>
> > On different hardware with the same software I'm also getting problems
> > starting DomUs, but this time the error is different. I've attached a
> > copy of the xl console output, but basically the server hang at
> > "Mount-cache hash table entries: 512". Again the VM is paravirtualised,
> > and again I get a qemu-dm process for it.
> 
> > The references to this message are normally related to memory issues,
> > but the server has only 1000M of ram, so can't see it causing too much
> > of a problem.
> 
> > Is this related to the other problems I'm seeing or completely separate?
> 
> > thanks,
> 
> > Anthony
> 
> 
> 
> 
> 
> -- 
> Best regards,
>  Sander                            mailto:linux@eikelenboom.it
> 
> 
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