Date: Sun, 17 Sep 2000 18:32:35 -0600 From: Ben Schumacher <ben@henshaw.net> To: Julian Elischer <julian@elischer.org> Cc: freebsd-net@freebsd.org Subject: Re: netgraph based MAC authentication (core dump information) Message-ID: <5.0.0.25.2.20000917182707.01c52a20@pop.henshaw.net> In-Reply-To: <39C326FD.41C67EA6@elischer.org> References: <5.0.0.25.2.20000913221340.00a04950@pop.henshaw.net> <5.0.0.25.2.20000915183859.026c2310@pop.henshaw.net>
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At 12:53 AM 9/16/2000 -0700, Julian Elischer wrote:
>Enable kernel core-dumps
>and compile your kernel with -g so that you can examine
>the core-dump and see where the crash was.
Alright here's what I gathered from the core dump. I don't know much about
the networking code in the kernel, so I'm not certain exactly what's going
on, but I hope somebody else can figure it out.
(kgdb) where
#0 boot (howto=260) at ../../kern/kern_shutdown.c:302
#1 0xc013e84d in panic (fmt=0xc023f854 "from debugger") at
../../kern/kern_shutdown.c:552
#2 0xc011d8f9 in db_panic (addr=-1072107089, have_addr=0, count=-1,
modif=0xc93babec "")
at ../../ddb/db_command.c:433
#3 0xc011d899 in db_command (last_cmdp=0xc0269758, cmd_table=0xc02695b8,
aux_cmd_tablep=0xc0283f2c)
at ../../ddb/db_command.c:333
#4 0xc011d95e in db_command_loop () at ../../ddb/db_command.c:455
#5 0xc011fa6b in db_trap (type=12, code=0) at ../../ddb/db_trap.c:71
#6 0xc021dfc2 in kdb_trap (type=12, code=0, regs=0xc93bad40) at
../../i386/i386/db_interface.c:158
#7 0xc022cebc in trap_fatal (frame=0xc93bad40, eva=38) at
../../i386/i386/trap.c:922
#8 0xc022cb95 in trap_pfault (frame=0xc93bad40, usermode=0, eva=38) at
../../i386/i386/trap.c:820
#9 0xc022c723 in trap (frame={tf_fs = 16, tf_es = 16, tf_ds = 16, tf_edi =
-918835756, tf_esi = -1065955662,
tf_ebp = -918835836, tf_isp = -918835860, tf_ebx = -16369088, tf_edx
= 65534, tf_ecx = -1065955682,
tf_eax = 0, tf_trapno = 12, tf_err = 0, tf_eip = -1072107089, tf_cs
= 8, tf_eflags = 66178,
tf_esp = -1065955840, tf_ss = -918835756}) at ../../i386/i386/trap.c:426
#10 0xc018f1af in in_broadcast (in={s_addr = 4278598208}, ifp=0x0) at
../../netinet/in.c:736
#11 0xc019a446 in udp_input (m=0xc076ce00, off=20, proto=17) at
../../netinet/udp_usrreq.c:238
#12 0xc01921e9 in ip_input (m=0xc076ce00) at ../../netinet/ip_input.c:738
#13 0xc0192247 in ipintr () at ../../netinet/ip_input.c:766
#14 0xc021fd65 in swi_net_next ()
#15 0xc015d72d in sendit (p=0xc89c3260, s=4, mp=0xc93baf10, flags=0) at
../../kern/uipc_syscalls.c:520
#16 0xc015d821 in sendto (p=0xc89c3260, uap=0xc93baf80) at
../../kern/uipc_syscalls.c:572
#17 0xc022d195 in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
tf_edi = -1078004048, tf_esi = 671511360,
tf_ebp = -1078004024, tf_isp = -918835244, tf_ebx = 671511548,
tf_edx = -1078003928, tf_ecx = -7,
tf_eax = 133, tf_trapno = 7, tf_err = 2, tf_eip = 671741624, tf_cs =
31, tf_eflags = 647,
tf_esp = -1078004116, tf_ss = 47}) at ../../i386/i386/trap.c:1126
#18 0xc021e905 in Xint0x80_syscall ()
#19 0x8048add in ?? ()
#20 0x8048651 in ?? ()
(kgdb) up 10
#10 0xc018f1af in in_broadcast (in={s_addr = 4278598208}, ifp=0x0) at
../../netinet/in.c:736
736 if (in.s_addr == INADDR_BROADCAST ||
(kgdb) list
731 struct ifnet *ifp;
732 {
733 register struct ifaddr *ifa;
734 u_long t;
735
736 if (in.s_addr == INADDR_BROADCAST ||
737 in.s_addr == INADDR_ANY)
738 return 1;
739 if ((ifp->if_flags & IFF_BROADCAST) == 0)
740 return 0;
(kgdb) print in
$1 = {s_addr = 6422528}
(kgdb) print in.s_addr
$2 = 6422528
(kgdb) up
#11 0xc019a446 in udp_input (m=0xc076ce00, off=20, proto=17) at
../../netinet/udp_usrreq.c:238
238 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
(kgdb) up
#12 0xc01921e9 in ip_input (m=0xc076ce00) at ../../netinet/ip_input.c:738
738 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, off, nh);
(kgdb) up
#13 0xc0192247 in ipintr () at ../../netinet/ip_input.c:766
766 ip_input(m);
(kgdb) up
#14 0xc021fd65 in swi_net_next ()
(kgdb) up
#15 0xc015d72d in sendit (p=0xc89c3260, s=4, mp=0xc93baf10, flags=0) at
../../kern/uipc_syscalls.c:520
520 error = so->so_proto->pr_usrreqs->pru_sosend(so, to, &auio,
0, control,
(kgdb) up
#16 0xc015d821 in sendto (p=0xc89c3260, uap=0xc93baf80) at
../../kern/uipc_syscalls.c:572
572 return (sendit(p, uap->s, &msg, uap->flags));
(kgdb) up
#17 0xc022d195 in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
tf_edi = -1078004048, tf_esi = 671511360,
tf_ebp = -1078004024, tf_isp = -918835244, tf_ebx = 671511548,
tf_edx = -1078003928, tf_ecx = -7,
tf_eax = 133, tf_trapno = 7, tf_err = 2, tf_eip = 671741624, tf_cs =
31, tf_eflags = 647,
tf_esp = -1078004116, tf_ss = 47}) at ../../i386/i386/trap.c:1126
1126 error = (*callp->sy_call)(p, args);
(kgdb) quit
BTW- Since this is my first time doing this, I might have missed
somebody. If you need me to go deep into any section (maybe print out more
variables), please let me know.
Thanks for your help,
- Ben Schumacher
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