Re: [Xen-devel] 2.6.37 dom0 non-fatal BUG: sleeping function called from invalid context at kernel/mutex.c:85

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Jan 06, 2011 at 08:23:14PM +0200, Pasi Kärkkäinen wrote:
> On Thu, Jan 06, 2011 at 07:36:28PM +0200, Pasi Kärkkäinen wrote:
> > Hello,
> > 
> > First of all.. big thanks to everyone involved in upstreaming Xen dom0 
> > bits! 
> > 
> > I just tried upstream pvops 2.6.37 dom0 kernel on one of my machines, and 
> > it worked
> > out-of-the-box ! Even nouveau kms/modesetting worked just fine.
> > 
> > There was non-fatal BUG/traceback though:
> > 
> > Full dmesg log available at: 
> > http://pasik.reaktio.net/xen/logs/dmesg-2.6.37-1.xendom0.fc15.x86_64-kms-modesetting.txt
> > 
> 
> Additional data.. latest xen/stable-2.6.32.x dom0 kernel (2.6.32.27) doesn't 
> have this BUG/traceback.
>

Sorry for the noise.. it seems this is a bug in the xhci driver in 2.6.37.
It's already fixed upstream but the fix is not in 2.6.37.

I noticed the bugreport from lkml, it seems to happen also on baremetal for 
other people.
(it didn't for me).

Well.. at least it was not xen dom0 specific bug :)

-- Pasi


From: Greg KH <gregkh@xxxxxxx>
To: Robert Hancock <hancockrwd@xxxxxxxxx>
Cc: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>,
        Linux-usb <linux-usb@xxxxxxxxxxxxxxx>,
        linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>
Date: Wed, 5 Jan 2011 16:30:03 -0800
Subject: Re: Sleeping function called from invalid context in 2.6.37 xhci_hcd

On Wed, Jan 05, 2011 at 06:22:03PM -0600, Robert Hancock wrote:
> Just saw this on booting up on the latest Fedora Rawhide kernel
> based on 2.6.37. Looks like we were trying to do a runtime suspend
> on the xHCI USB controller and it disabled MSI-X while interrupts
> were disabled?


Known issue, patches came in too late to make it for .37, hopefully will
show up in .38-rc and then get backported to .37.  They are on the
linux-usb mailing list if you need them now.

Hope this helps,

greg k-h



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