From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:56384) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sgvd1-0002fD-HH for qemu-devel@nongnu.org; Tue, 19 Jun 2012 06:25:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Sgvcz-0003w2-6r for qemu-devel@nongnu.org; Tue, 19 Jun 2012 06:25:43 -0400 Received: from indium.canonical.com ([91.189.90.7]:40141) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sgvcy-0003vx-Uy for qemu-devel@nongnu.org; Tue, 19 Jun 2012 06:25:41 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.71 #1 (Debian)) id 1Sgvcx-0004oa-GY for ; Tue, 19 Jun 2012 10:25:39 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 7C7BB2E8079 for ; Tue, 19 Jun 2012 10:25:39 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Tue, 19 Jun 2012 10:16:32 -0000 From: "Richard W.M. Jones" Sender: bounces@canonical.com References: <20120614155150.12135.95018.malonedeb@gac.canonical.com> Message-Id: <20120619101632.26711.75593.malone@soybean.canonical.com> Errors-To: bounces@canonical.com Subject: [Qemu-devel] [Bug 1013241] Re: qemu-system-ppc64 hanging occasionally in disk writes Reply-To: Bug 1013241 <1013241@bugs.launchpad.net> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org I switched to using virtio-scsi (instead of virtio-blk). This appears to h= ave solved this problem, although it brings another problem. I also tried vscsi, whic= h fixes both problems. Therefore I will (not definitively) claim that the problem lies somewhere i= n virtio-blk, but a workaround seems to be available. -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1013241 Title: qemu-system-ppc64 hanging occasionally in disk writes Status in QEMU: New Bug description: I found last week that qemu-system-ppc64 (from git) hangs occasionally = = under load, and I have a reproducer for it now. Unfortunately the = = reproducer really takes a long time to run -- usually I can get a hang = = in under 12 hours. = = = = Here is the reproducer case: = = = = https://lists.fedoraproject.org/pipermail/ppc/2012-June/001698.html = = = = Notes: = = = = (1) Verified by one other person (other than me). Happens on both = = ppc64 and x86-64 host. = = = = (2) Happens with both Fedora guest kernel 3.3.4-5.fc17.ppc64 and kernel = = 3.5.0 that I compiled myself. The test case above contains 3.3.4-5. = = = = (3) Seems to be a problem in qemu, not the guest. The reason I think = = this is because I tried to capture a backtrace of the hang using = = remote gdb, but gdb just hung when trying to connect to qemu = = (gdb connects fine before the bug happens). = = = = (4) Judging by guest messages, appears to be happening when writing = = to the disk. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1013241/+subscriptions