From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Vrabel Subject: Re: xen-gntdev gets stuck unmapping a 2nd page Date: Wed, 10 Sep 2014 13:41:11 +0100 Message-ID: <541046E7.1070208@citrix.com> References: <709EE516-B56A-41E2-9DE8-9EC3898F8B22@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1XRhD1-0007SE-Qz for xen-devel@lists.xenproject.org; Wed, 10 Sep 2014 12:41:15 +0000 In-Reply-To: <709EE516-B56A-41E2-9DE8-9EC3898F8B22@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Dave Scott , "xen-devel@lists.xenproject.org" Cc: John Else , David Vrabel , Anil Madhavapeddy List-Id: xen-devel@lists.xenproject.org On 05/09/14 22:04, Dave Scott wrote: > Hi, > > I've been playing more with vchan and I think I've hit a bug in xen-gntdev. > It works ok if I map/unmap in a single page. If I increase the buffer size > and cause vchan to map a second page (non-contiguous mappings via 2 distinct > libxc calls), the process gets stuck in disk sleep when unmapping the second > page. The same happens if I comment out the unmap and let the program exit. > > I'm using a 3.13 kernel: Can you try the latest kernel? This looks like it may be a bug in the generic memory hotplug device driver rather than something specific to gntdev. David