linux-kernel - Re: [Bugme-new] [Bug 15621] New: BUG: unable to handle kernel paging request

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Message-ID: <20100329091241.GA3237@oracle.com>
Date:	Mon, 29 Mar 2010 12:12:41 +0300
From:	Ozgur Yuksel <ozgur.yuksel@...cle.com>
To:	Dominik Brodowski <linux@...inikbrodowski.net>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Dmitry Torokhov <dtor@...l.ru>,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 15621] New: BUG: unable to handle kernel
 paging request - comm: pccardd

Thu, Mar 25, 2010 at 06:01:38PM +0100 was the time for Dominik Brodowski to speak thus:
> 
> On Thu, Mar 25, 2010 at 10:51:39AM -0600, Bjorn Helgaas wrote:
> > > It looks like the iomem_resource tree got wrecked.  Has anyone been
> > > changing anything in there lately?
> > 
> > My pci=use_crs patches change the contents of the iomem_resource tree,
> > and it's possible they broke some assumptions PCMCIA was making, so
> > you might see if "pci=nocrs" makes any difference.  If it does, please
> > attach an acpidump and the entire dmesg logs with and without that option.
> 
> ... and /proc/iomem as well as /proc/ioports , please.
Using pci=nocrs workarounds the problem. For data collection, since the boot
does not complete without the w/a - only dmesg is available. 

With pci=nocrs, accessing /proc/iomem gets killed by kernel for some reason.

/proc/iomem /proc/ioports and acpidump are provided for 2.6.31-20-generic-pae
kernel for convenience / comparison.
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