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List:       freebsd-net
Subject:    Panic in radix.c
From:       Nick Sayer <nsayer () quack ! kfu ! com>
Date:       2001-12-29 16:15:16
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First, let me start out by saying that I have hacked in Kame's NATPT 
functionality into this kernel, so it's entirely possible that is 
causing this, but I thought I'd ask anyway.

Here's a stack trace from this panic:

(above this is the trap, savecore and reboot)
#17 0xc018b973 in rn_match (v_arg=0xc904326c, head=0xc0f33f80)
     at ../../net/radix.c:240
#18 0xc0192b96 in in_matroute (v_arg=0xc904326c, head=0xc0f33f80)
     at ../../netinet/in_rmx.c:151
#19 0xc018cdd6 in rtalloc1 (dst=0xc904326c, report=1, ignflags=0)
     at ../../net/route.c:135
#20 0xc018cd90 in rtalloc_ign (ro=0xc9043268, ignore=0)
     at ../../net/route.c:111
#21 0xc018cd39 in rtalloc (ro=0xc9043268) at ../../net/route.c:91
#22 0xc01a2365 in tcp_rtlookup (inp=0xc9043220)
     at ../../netinet/tcp_subr.c:1349
#23 0xc01a23e6 in tcp_gettaocache (inp=0xc9043220)
     at ../../netinet/tcp_subr.c:1443
#24 0xc019e464 in tcp_input (m=0xc07b1200, off0=20, proto=6)
     at ../../netinet/tcp_input.c:1117
#25 0xc0199b6d in ip_input (m=0xc07b1200) at ../../netinet/ip_input.c:862
#26 0xc0193b3a in transmit_event (pipe=0xc0f61200)
     at ../../netinet/ip_dummynet.c:431
#27 0xc0193d2b in ready_event (q=0xc0f8b180) at 
../../netinet/ip_dummynet.c:566
#28 0xc0194b43 in dummynet_io (pipe_nr=1, dir=2, m=0xc07b1200, ifp=0x0,
     ro=0x0, dst=0x0, rule=0xc0ebd970, flags=0)
     at ../../netinet/ip_dummynet.c:1137
#29 0xc019972b in ip_input (m=0xc07b1200) at ../../netinet/ip_input.c:465
#30 0xc0199bcb in ipintr () at ../../netinet/ip_input.c:890

net/radix.c line 240 is this:

	if (t->rn_bmask & cp[t->rn_offset])

The trap was caused by cp being set to NULL.

Unfortunately, I can't quite wrap my head around the logic in this 
routine. The input parameters are not NULL, so cp must have got that way 
somewhere in the loop.





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