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

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Message-Id: <201003301711.00351.bjorn.helgaas@hp.com>
Date:	Tue, 30 Mar 2010 17:10:59 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Ozgur Yuksel <ozgur.yuksel@...cle.com>
Cc:	Dominik Brodowski <linux@...inikbrodowski.net>,
	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,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [Bugme-new] [Bug 15621] New: BUG: unable to handle kernel paging request - comm: pccardd

Rafael, this is a regression from 2.6.33, in case it's not on your
list yet.

Ozgur, thanks for attaching the logs.  There's some interesting stuff
there that I don't understand yet, such as this from the pci=nocrs dmesg:

  [    1.577758] pci 0000:00:1e.0: PCI bridge to [bus 03-04]
  [    1.583031] pci 0000:00:1e.0:   bridge window [io  0x5000-0x5fff]
  [    1.551889] pci 0000:03:01.0: CardBus bridge to [bus 04-07]
  [    1.557507] pci 0000:03:01.0:   bridge window [io  0x5000-0x50ff]
  [    1.603303] PCI: No. 2 try to assign unassigned res
  [    1.688208] pci 0000:03:01.0: CardBus bridge to [bus 04-07]
  [    1.693826] pci 0000:03:01.0:   bridge window [io  0x0000-0x00ff]

Apparently we moved that CardBus I/O window from [0x5000-0x5fff] to
[0x0-0xff].  I'm dubious about that because the upstream bridge at
00:1e.0 only positively decodes [0x5000-0x5fff] (though it *is* in
subtractive decode mode, so it will forward more).  I wish we had
a little more debug output about when & why we moved that window.

I'm especially dubious because your /proc/ioports with pci=nocrs
from comment 8 (which is the case that's supposed to be working)
contains this:

  5000-5fff : PCI Bus 0000:03
    0000-00ff : PCI CardBus 0000:04
    0000-00ff : PCI CardBus 0000:04

That looks completely broken in terms of the hierarchy.  It looks
like you have a USB device in the CardBus slot (ohci_hcd 0000:04:00.0).
Maybe the broken hierarchy doesn't cause problems with this device
because it doesn't use I/O ports.

Anyway, I'd like to see the entire dmesg log when booted *without*
pci=nocrs, because that's the case that fails.  Since the system doesn't
boot, you'll have to use a serial console or netconsole to collect the
whole thing.  The serial console log in comment 7 is corrupted; it looks
like all the lines got truncated to 80 columns or something.  And please
boot with "ignore_loglevel" so we see all the debug messages on the console.
Also, no need to tar up and compress your attachments -- I always figure
if bugzilla wants to compress stuff, it can do it internally without
bothering us.
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