Re: [Qemu-devel] pcnet/mingw32 debug info (help needed)

[Kazu]

Hi,

Sent: Friday, July 22, 2005 4:31 PM Christian MICHON wrote:


> here's the output of gdb. If anyone can make something from it,
> thanks in advance.

This is a part of  backtrace output of gdb after I set IP address and ping 
10.0.2.2.
I seems that arp packet loops endlessly between pcnet and slirp.
I think something is wrong in pcnet_receive?

#27399 0x004552ac in pcnet_transmit (s=0xcdbf8e8)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/hw/pcnet.c:582
#27400 0x00455571 in pcnet_poll (s=0xcdbf8e8)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/hw/pcnet.c:625
#27401 0x00454fc3 in pcnet_receive (opaque=0xcdbf8e8, buf=0x22f7b0 "RT",
   size=0) at C:/msys/1.0/home/kazu/qemu-0.7.0/hw/pcnet.c:538
#27402 0x004025f7 in slirp_output (pkt=0x22f7b0 "RT", pkt_len=42)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/vl.c:1402
#27403 0x0045b980 in arp_input (pkt=0xcdbfc30 "??????RT", pkt_len=42)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/slirp/slirp.c:583
#27404 0x0045b9dc in slirp_input (pkt=0xcdbfc30 "??????RT", pkt_len=42)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/slirp/slirp.c:602
#27405 0x00402611 in slirp_send_packet (nd=0x4e6a90, buf=0xcdbfc30 
"??????RT",
   size=42) at C:/msys/1.0/home/kazu/qemu-0.7.0/vl.c:1411
#27406 0x00402541 in qemu_send_packet (nd=0x4e6a90, buf=0xcdbfc30 
"??????RT",
   size=42) at C:/msys/1.0/home/kazu/qemu-0.7.0/vl.c:1353
#27407 0x004552ac in pcnet_transmit (s=0xcdbf8e8)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/hw/pcnet.c:582
#27408 0x00455571 in pcnet_poll (s=0xcdbf8e8)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/hw/pcnet.c:625
#27409 0x004556aa in pcnet_poll_timer (opaque=0xcdbf8e8)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/hw/pcnet.c:647
#27410 0x00455fa1 in pcnet_ioport_writew (opaque=0xcdbf8e8, addr=49202, 
val=0)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/hw/pcnet.c:915
#27411 0x004018f0 in cpu_outw (env=0x3d7358, addr=49202, val=0)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/vl.c:372
#27412 0x0078456b in code_gen_buffer ()
#27413 0x00404315 in main_loop () at 
C:/msys/1.0/home/kazu/qemu-0.7.0/vl.c:2700
#27414 0x00406c94 in main (argc=6, argv=0x3d27e8)
   at C:/msys/1.0/home/kazu/qemu-0.7.0/vl.c:3719
(gdb) q

This backtrace said that as follows.

cpu_outputw
pcnet_ioport_wirtew         <- arp packet is send from pcnet to slirp
pcnet_poll_timer
pcnet_poll
pcnet_transmit
<snip>
slirp_input
arp_input              <- arp packet returns form slirp to pcnet
slirp_output
pcnet_receive      <- arp packet received by pcnet
pcnet_poll           <- I don't know why pcnet_poll is called again
pcnet_transmit     <- endless loop

Regards,
Kazu