From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35897) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZV0RY-0005u3-6B for qemu-devel@nongnu.org; Thu, 27 Aug 2015 12:54:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZV0RT-0004ND-6W for qemu-devel@nongnu.org; Thu, 27 Aug 2015 12:54:28 -0400 Received: from know-smtprelay-omc-7.server.virginmedia.net ([80.0.253.71]:41586) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZV0RS-0004Li-TW for qemu-devel@nongnu.org; Thu, 27 Aug 2015 12:54:23 -0400 Date: Thu, 27 Aug 2015 17:52:58 +0100 From: Ken Moffat Message-ID: <20150827165258.GA13620@milliways> References: <20150824234015.GA24111@milliways> <20150827115914.GA2258@milliways> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20150827115914.GA2258@milliways> Subject: Re: [Qemu-devel] Lockups with 4.2-rc kernels and qemu List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: linux-kernel@vger.kernel.org Cc: qemu-devel@nongnu.org On Thu, Aug 27, 2015 at 12:59:14PM +0100, Ken Moffat wrote: > On Tue, Aug 25, 2015 at 12:40:15AM +0100, Ken Moffat wrote: > > (Cc'ing qemu-devel, please keep me in the Cc). > > > > TL;DR - qemu locks up my machine when I use 4.2-rc kernels. > > > Previous mail, or at least the copy to qemu, archived at > https://lists.gnu.org/archive/html/qemu-devel/2015-08/msg02784.html > > I started bisecting, but it is going to be a slow business - kernels > which seem to be ok after e.g. 3 hours can still lock the box. I > left it running overnight, and this morning it was still up - but > firefox could no longer connect externally. I eventually tracked > that to my logs taking the space. But one reason the logs had > become so big was the following (found from this morning's restart): > > Aug 27 09:50:28 ac4tv kernel: [ 124.279813] BUG: scheduling while > atomic: qemu-system-x86/1789/0x00000002 > Aug 27 09:50:28 ac4tv kernel: [ 124.279819] Modules linked in: > psmouse i2c_piix4 asus_atk0110 microcode k10temp > Aug 27 09:50:28 ac4tv kernel: [ 124.279828] Preemption disabled > at:[] kvm_vcpu_ioctl+0x7c/0x580 This is definitely a *different* bug - I just tried the next kernel, and started to get these messages (almost 100,000 lines of them in the next 4 minutes) : if that had been happening a couple of weeks ago, I would have noticed ;-) But, the end result is that I cannot attempt to bisect the lockups, this scheduling while atomic business is preventing me looking for a good kernel. Has anybody had success qith qemu on an x86_64 host running a 4.2-rc kernel ? Looks as if I'll have to give up, and hope that the main problem doe not spread to 4.1. ĸen -- This one goes up to eleven: but only on a clear day, with the wind in the right direction.