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Re: [Qemu-devel] [BUG] Regression in networking code (SIGSEGV)
From: |
Gleb Natapov |
Subject: |
Re: [Qemu-devel] [BUG] Regression in networking code (SIGSEGV) |
Date: |
Thu, 22 Jan 2009 09:38:00 +0200 |
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)?
> Regards
> Stefan Weil
>
> 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=<value optimized
> 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.