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Date: Thu, 15 Sep 2011 15:45:00 +0200
From: Jan Kiszka <jan.kiszka@web.de>
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Subject: Re: [Qemu-devel] [Bug 824650] [NEW] Latest GIT assert error in
	arp_table.c
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To: Roy Tam <roytam@gmail.com>
Cc: Bug 824650 <824650@bugs.launchpad.net>, qemu-devel@nongnu.org

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On 2011-09-15 15:20, Roy Tam wrote:
> 2011/9/15 Jan Kiszka <jan.kiszka@web.de>:
>> On 2011-09-15 14:05, Roy Tam wrote:
>>> Here you go.
>>>
>>> sb16: warning: command 0xf,1 is not truly understood yet
>>> sb16: warning: command 0xe,2 is not truly understood yet
>>> [Switching to Thread 13840.0x3140]
>>>
>>> Breakpoint 1, arp_table_search (slirp=3D0x19f7380, ip_addr=3D42949672=
95,
>>>     out_ethaddr=3D0x20af64a "") at slirp/arp_table.c:75
>>> 75      //    assert((ip_addr & htonl(~(0xf << 28))) !=3D 0);
>>> (gdb) c
>>> Continuing.
>>> [New Thread 13840.0x31b8]
>>> [Switching to Thread 13840.0x3628]
>>>
>>> Breakpoint 1, arp_table_search (slirp=3D0x19f7380, ip_addr=3D0,
>>>     out_ethaddr=3D0x22f642 "\"") at slirp/arp_table.c:75
>>> 75      //    assert((ip_addr & htonl(~(0xf << 28))) !=3D 0);
>>> (gdb) bt
>>> #0  arp_table_search (slirp=3D0x19f7380, ip_addr=3D0, out_ethaddr=3D0=
x22f642 "\"")
>>>     at slirp/arp_table.c:75
>>> #1  0x004bafbd in if_encap (slirp=3D0x19f7488, ifm=3D0x2255978)
>>>     at slirp/slirp.c:709
>>> #2  0x004b8a73 in if_start (slirp=3D0x19f7380) at slirp/if.c:210
>>> #3  0x004b9c9e in ip_output (so=3D0x2255978, m0=3D0x0) at slirp/ip_ou=
tput.c:84
>>> #4  0x004bf737 in tcp_output (tp=3D0x1cac848) at slirp/tcp_output.c:4=
56
>>> #5  0x004c09ad in tcp_drop (tp=3D0x1cac848, err=3D0) at slirp/tcp_sub=
r.c:225
>>> #6  0x004c1182 in tcp_timers (timer=3D<optimized out>, tp=3D<optimize=
d out>)
>>>     at slirp/tcp_timer.c:287
>>> #7  tcp_slowtimo (slirp=3D0x0) at slirp/tcp_timer.c:88
>>> #8  0x004bb6f1 in slirp_select_poll (readfds=3D0x22fae0, writefds=3D0=
x22f9dc,
>>>     xfds=3D0x22f8d8, select_error=3D2291816) at slirp/slirp.c:433
>>> #9  0x0048fb87 in main_loop_wait (nonblocking=3D0)
>>>     at C:/msys/home/User/qemu/vl.c:1436
>>> #10 0x00490d10 in main_loop () at C:/msys/home/User/qemu/vl.c:1466
>>> #11 qemu_main (argc=3D0, argv=3D0x19f5100, envp=3D0x0)
>>>     at C:/msys/home/User/qemu/vl.c:3453
>>> #12 0x0049322d in SDL_main (argc=3D17, argv=3D0x19f5100)
>>>     at C:/msys/home/User/qemu/vl.c:102
>>> #13 0x005eb784 in console_main ()
>>> #14 0x005eb844 in WinMain@16 ()
>>> #15 0x005eb068 in main ()
>>> (gdb) frame 4
>>> #4  0x004bf737 in tcp_output (tp=3D0x1cac848) at slirp/tcp_output.c:4=
56
>>> 456             error =3D ip_output(so, m);
>>> (gdb) print *tp
>>> $1 =3D {seg_next =3D 0x1cac848, seg_prev =3D 0x1cac848, t_state =3D 0=
, t_timer =3D {0,
>>>     0, 0, 0}, t_rxtshift =3D 0, t_rxtcur =3D 12, t_dupacks =3D 0, t_m=
axseg =3D 1460,
>>>   t_force =3D 0 '\000', t_flags =3D 0, t_template =3D {ti_i =3D {ih_m=
buf =3D {
>>>         mptr =3D 0x0, dummy =3D 0}, ih_x1 =3D 0 '\000', ih_pr =3D 0 '=
\000',
>>>       ih_len =3D 0, ih_src =3D {S_un =3D {S_un_b =3D {s_b1 =3D 0 '\00=
0',
>>>             s_b2 =3D 0 '\000', s_b3 =3D 0 '\000', s_b4 =3D 0 '\000'},=
 S_un_w =3D {
>>>             s_w1 =3D 0, s_w2 =3D 0}, S_addr =3D 0}}, ih_dst =3D {S_un=
 =3D {S_un_b =3D {
>>>             s_b1 =3D 0 '\000', s_b2 =3D 0 '\000', s_b3 =3D 0 '\000',
>>>             s_b4 =3D 0 '\000'}, S_un_w =3D {s_w1 =3D 0, s_w2 =3D 0}, =
S_addr =3D 0}}},
>>
>> That confirms my theory: the template is not yet initialized.
>>
>> A shot from the hips: does this patch help?
>>
>=20
> Yeah the assertion doesn't fail anymore. Thanks.

Now I just need to invent some good "why this is correct"... ;)

Thanks for testing,
Jan


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