From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: Re: 2.6.32.27 dom0 - BUG: unable to handle kernel paging request Date: Mon, 14 Feb 2011 16:19:19 -0800 Message-ID: <4D59C687.5030001@goop.org> References: <4D1D0E44.9030807@theshore.net> <1294132563.3831.11.camel@zakaz.uk.xensource.com> <31258BA9-9301-4144-B8F4-4F799BB4BB74@theshore.net> <1294173242.13733.1.camel@localhost.localdomain> <4517209A-2F8B-41A1-9727-A0E498181135@theshore.net> <20110110185610.GC9837@dumpdata.com> <4D2B7EE8.7070309@nuclearfallout.net> <614A8802-4406-48BF-83FF-69EAA2A233E1@theshore.net> <4D472486.9050205@theshore.net> <4D4736E4.6090806@goop.org> <4D59C039.2040300@theshore.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4D59C039.2040300@theshore.net> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "Christopher S. Aker" Cc: Ian Campbell , xen devel List-Id: xen-devel@lists.xenproject.org On 02/14/2011 03:52 PM, Christopher S. Aker wrote: > On 1/31/11 5:25 PM, Jeremy Fitzhardinge wrote: >> On 01/31/2011 01:07 PM, Christopher S. Aker wrote: >>> Ian / Jeremy: Where do I go from here? >> >> It's also not impossible this bug is related to the "get_user_pages" bug >> that has been discussed over the last few days. I need to think about >> that too. > > How's that going? Any epiphanies? I've been trying to follow the > list (and changesets) but wasn't sure if a potential fix snuck in or > if there's something else I should be pressure cooking (an unrelated > patch that may have the side effect of fixing my issue, for example). No, I had a close look at it the other day and remained stumped. It looks like the pgd is being freed while still in use, but I couldn't see where that could happen unprotected from the lock. This is really bugging me - there's something strange going on, which worries me. J