[Bug 15621] BUG: unable to handle kernel paging request - comm: pccardd

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https://bugzilla.kernel.org/show_bug.cgi?id=15621





--- Comment #9 from Ozgur Yuksel <ozgur.yuksel at oracle.com>  2010-03-29 09:13:32 ---
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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