From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LRCYC-0004Nr-Tw for qemu-devel@nongnu.org; Sun, 25 Jan 2009 16:29:52 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LRCYB-0004Lz-Rl for qemu-devel@nongnu.org; Sun, 25 Jan 2009 16:29:52 -0500 Received: from [199.232.76.173] (port=44397 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LRCYB-0004Lc-MJ for qemu-devel@nongnu.org; Sun, 25 Jan 2009 16:29:51 -0500 Received: from moutng.kundenserver.de ([212.227.17.9]:53840) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1LRCYB-0006Js-3q for qemu-devel@nongnu.org; Sun, 25 Jan 2009 16:29:51 -0500 Message-ID: <497CD9C2.4010305@mail.berlios.de> Date: Sun, 25 Jan 2009 22:29:38 +0100 From: Stefan Weil MIME-Version: 1.0 Subject: Re: [Qemu-devel] [BUG] Regression in networking code (SIGSEGV) References: <497790E0.7050905@mail.berlios.de> <20090122073800.GK27675@redhat.com> <497B8171.5040409@mail.berlios.de> <20090124215346.GH19498@hall.aurel32.net> In-Reply-To: <20090124215346.GH19498@hall.aurel32.net> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Aurelien Jarno , QEMU Developers 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. Stefan > >> The target system is Debian mips. >> >> Regards >> Stefan >> >> >>>> Program received signal SIGSEGV, Segmentation fault. >>>> [Switching to Thread 0x7f3be89386e0 (LWP 14845)] >>>> 0x00000000004d1a6f in ip_reass (ip=0xfe96e0, fp=0x1109050) at >>>> ~/src/qemu/trunk/slirp/ip_input.c:408 >>>> 408 ip->ip_len = next; >>>> (gdb) i s >>>> #0 0x00000000004d1a6f in ip_reass (ip=0xfe96e0, fp=0x1109050) at >>>> ~/src/qemu/trunk/slirp/ip_input.c:408 >>>> #1 0x00000000004d15ad in ip_input (m=0x110e010) at >>>> ~/src/qemu/trunk/slirp/ip_input.c:228 >>>> #2 0x00000000004b3d25 in slirp_input (pkt=0x12fcbd0 "RT", pkt_len=1294) >>>> at ~/src/qemu/trunk/slirp/slirp.c:679 >>>> #3 0x000000000049a07d in qemu_send_packet (vc1=0x10ff440, buf=0x12fcbd0 >>>> "RT", size=1294) at ~/src/qemu/trunk/net.c:399 >>>> #4 0x000000000042ea6a in pcnet_transmit (s=0x12fc810) at >>>> ~/src/qemu/trunk/hw/pcnet.c:1300 >>>> #5 0x000000000042ebd8 in pcnet_poll_timer (opaque=>>> out>) at ~/src/qemu/trunk/hw/pcnet.c:1363 >>>> #6 0x000000000042f270 in pcnet_ioport_writew (opaque=0x7f3be72a79e0, >>>> addr=17884784, val=16684768) >>>> at ~/src/qemu/trunk/hw/pcnet.c:1645 >>>> #7 0x0000000000405eb8 in ioport_write (index=1, address=4146, data=0) >>>> at ~/src/qemu/trunk/vl.c:302 >>>> #8 0x00000000004062b5 in cpu_outw (env=0x0, addr=4146, val=0) at >>>> ~/src/qemu/trunk/vl.c:432 >>>> #9 0x00000000420ae755 in ?? () >>>> #10 0x0000000000000000 in ?? () >>>> (gdb) up >>>> #1 0x00000000004d15ad in ip_input (m=0x110e010) at >>>> ~/src/qemu/trunk/slirp/ip_input.c:228 >>>> 228 ip = ip_reass(ip, fp); >>>> (gdb) p ip >>>> $1 = (struct ip *) 0x110e060 >>>> (gdb) do >>>> #0 0x00000000004d1a6f in ip_reass (ip=0xfe96e0, fp=0x1109050) at >>>> ~/src/qemu/trunk/slirp/ip_input.c:408 >>>> 408 ip->ip_len = next; >>>> (gdb) p *ip >>>> Cannot access memory at address 0xfe96e0 >>>> >>>> >>>> >>>> >>>> >>> -- >>> Gleb. >>> >>> >> >> > >