From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: Unstableness in grant table block drivers Date: Wed, 13 Apr 2005 20:43:32 -0500 Message-ID: <425DCAC4.6030407@us.ibm.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Ian Pratt Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Ian Pratt wrote: >OK, that's news to us - we haven't seen any problems. > >It's been tested with dd's and kernel builds, and wasn't expected to be >a particularly dangerous change. > >How you confirmed that disabling the option fixes your problems? Can you >give a simple recipe to provoke problems? > We've had three different systems lose the ability to start domUs. Disabling VBD grant tables fixed the problem. The best reproducable example we have is default config on a domU from today's xen-unstable snapshot. /dev/console is not accessible and no valid root is found. In my own case, it was working fairly well and then it just stopped working. It would die mid-way through boot. Again, disabling VBD grant-tables fixed the problem. I'm going to look into the problem this evening and see if I can get you guys a more reproducable scenario. >It doesn't seem to be destablizing, at least for us. Possibly there's >been some feature interaction with later checkins. > > Possibly. >Anyone using the unstable tree should be reading the changelog >closely... > > I agree. I do, but I don't think a lot of people do. I'm not trying to give you guys more work to do :-) Just a quick note to xen-devel would suffice (if you've got an extra second). Thanks Ian, Regards, Anthony Liguori >Ian > > >