From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LRWWk-0008Gu-Ok for qemu-devel@nongnu.org; Mon, 26 Jan 2009 13:49:42 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LRWWk-0008GO-22 for qemu-devel@nongnu.org; Mon, 26 Jan 2009 13:49:42 -0500 Received: from [199.232.76.173] (port=50670 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LRWWj-0008GF-P6 for qemu-devel@nongnu.org; Mon, 26 Jan 2009 13:49:41 -0500 Received: from mx20.gnu.org ([199.232.41.8]:52745) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1LRVMM-0007ej-Jq for qemu-devel@nongnu.org; Mon, 26 Jan 2009 12:34:54 -0500 Received: from mx2.redhat.com ([66.187.237.31]) by mx20.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1LRL2B-0000ei-HL for qemu-devel@nongnu.org; Mon, 26 Jan 2009 01:33:23 -0500 Date: Mon, 26 Jan 2009 08:29:19 +0200 From: Gleb Natapov Subject: Re: [Qemu-devel] [BUG] Regression in networking code (SIGSEGV) Message-ID: <20090126062919.GD15778@redhat.com> References: <497790E0.7050905@mail.berlios.de> <20090122073800.GK27675@redhat.com> <497B8171.5040409@mail.berlios.de> <20090124215346.GH19498@hall.aurel32.net> <497CD9C2.4010305@mail.berlios.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <497CD9C2.4010305@mail.berlios.de> Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Weil Cc: qemu-devel@nongnu.org On Sun, Jan 25, 2009 at 10:29:38PM +0100, Stefan Weil wrote: > Aurelien Jarno schrieb: > > On Sat, Jan 24, 2009 at 10:00:33PM +0100, Stefan Weil wrote: > > > >> Gleb Natapov schrieb: > >> > >>> On Wed, Jan 21, 2009 at 10:17:20PM +0100, Stefan Weil wrote: > >>> > >>> > >>>> Hi, > >>>> > >>>> the SIGSEGV crash below can be reproduced with Qemu r6391 and "high" net > >>>> load. > >>>> > >>>> I bootet a mips malta kernel from a debian nfs root. While this worked fine, > >>>> aptitude update hangs during downloads, nfs root is lost and after some time > >>>> Qemu gets a SIGSEGV. > >>>> > >>>> A similar crash occurs with a different mips machine (ar7) and different > >>>> network hardware (ar7 emac / cpmac), so it is not restricted to pcnet. > >>>> This second system does not survive the network boot. > >>>> > >>>> Up to now, I could not run tests with non-mips systems. > >>>> > >>>> I'm fairly sure that 2 weeks ago networking worked without problems in both > >>>> cases. > >>>> > >>>> > >>>> > >>> What is your host CPU? How you run qemu (what is your command line)? > >>> > >>> > >> Debian amd64 host. > >> > >> mipsel-softmmu/qemu-system-mipsel --kernel vmlinux \ > >> --append "debug nohz=off root=/dev/nfs rw ip=::::malta-le::dhcp" \ > >> -M malta --net nic --net user -m 256 > >> > > > > The fact that your host system is 64-bit and you are using the user > > networking is interesting. You could try to look at revisions 6272 and > > 6288, they are probably the cause of your problem. > > > > Yes, you are right. Reverting r6288 results in stable networking again. > > Thank you for this hint. > I also use amd64 host, but I was not able to reproduce this with other guests. I'll try mips guest. Can you try to reproduce the problem with different guest (x86 for instance)? -- Gleb.