From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53643) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1egapY-0005op-Qz for qemu-devel@nongnu.org; Tue, 30 Jan 2018 13:41:12 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1egaos-00026U-Ab for qemu-devel@nongnu.org; Tue, 30 Jan 2018 13:40:28 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45980) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1egaos-00024o-1x for qemu-devel@nongnu.org; Tue, 30 Jan 2018 13:39:46 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1EBD633BC5 for ; Tue, 30 Jan 2018 18:39:45 +0000 (UTC) Date: Tue, 30 Jan 2018 18:39:32 +0000 From: "Dr. David Alan Gilbert" Message-ID: <20180130183931.GF2536@work-vm> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] 4.14 linux kernel vs postcopy migration List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, aarcange@redhat.com Cc: peterx@redhat.com, quintela@redhat.com Hi, It looks like the 4.14 linux kernel has something which breaks postcopy; 4.13 and 4.15 both seem OK, but both Peter and myself ran into problems with double faults after postcopy migration on a Fedora 27 host, and I've recreated the same problem on upstream kernels =66rom v4.14.0 through v4.14.0. The stand alone userfaultfd tests seem ok though. I might try some further bisecting, but for now I think I'll just flip to a bleeding edge 4.15. Dave -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK