Got the crash dump... now what?

[Jonathon McKitrick]

Hey guys,

I finally got that panic I've been seeing.  Here's the backtrace.

Looks like a null pointer in netinet/ip_input, line 750.

I should also mention this is my laptop running apm but NOT ACPI.
This has happened with both my Linksys card and my Netgear.


(kgdb) backtrace
#0  dumpsys () at /usr/src/sys/kern/kern_shutdown.c:508
#1  0xc019af9f in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:341
#2  0xc019b3d0 in panic (fmt=0xc02ebaaa "from debugger") at
/usr/src/sys/kern/kern_shutdown.c:620
#3  0xc012c039 in db_panic (addr=-1071661484, have_addr=0, count=1,
modif=0xc8824b84 "") at /usr/src/sys/ddb/db_command.c:450
#4  0xc012bfd7 in db_command (last_cmdp=0xc0344ac4, cmd_table=0xc03448e4,
aux_cmd_tablep=0xc033fbf8, aux_cmd_tablep_end=0xc033fbfc)
    at /usr/src/sys/ddb/db_command.c:346
    #5  0xc012c0a3 in db_command_loop () at
    /usr/src/sys/ddb/db_command.c:472
    #6  0xc012e6c9 in db_trap (type=12, code=0) at
    /usr/src/sys/ddb/db_trap.c:72
    #7  0xc02c6c02 in kdb_trap (type=12, code=0, regs=0xc8824cd0) at
    /usr/src/sys/i386/i386/db_interface.c:161
    #8  0xc02d8472 in trap_fatal (frame=0xc8824cd0, eva=3735929054) at
    /usr/src/sys/i386/i386/trap.c:1139
    #9  0xc02d80a1 in trap_pfault (frame=0xc8824cd0, usermode=0,
    eva=3735929054) at /usr/src/sys/i386/i386/trap.c:1033
    #10 0xc02d7d28 in trap (frame=
          {tf_fs = -1057030120, tf_es = -1057030128, tf_ds = -1057423344,
	  tf_edi = 0, tf_esi = 0, tf_ebp = -930984600, tf_isp = -930984708,
	  tf_ebx = -1059715040, tf_edx = -559038242, tf_ecx = -930984656,
	  tf_eax = -933707776, tf_trapno = 12, tf_err = 0, tf_eip =
	  -1071661484, tf_cs = 8, tf_eflags = 66182, tf_esp = -1058648384,
	  tf_ss = -8388608}) at /usr/src/sys/i386/i386/trap.c:613
	  #11 0xc02c7b7b in calltrap ()
	  #12 0xc0ff0018 in ?? ()
	  #13 0xc0ff0010 in ?? ()
	  #14 0xc0f90010 in ?? ()
	  #15 0x00000000 in ?? ()
	  #16 0x00000000 in ?? ()
	  #17 0xc8824d68 in ?? ()
	  #18 0xc8824cfc in ?? ()
	  #19 0xc0d60820 in ?? ()
	  #20 0xdeadc0de in ?? ()
	  #21 0xc8824d30 in ?? ()
	  #22 0xc858c000 in ?? ()
	  #23 0x0000000c in ?? ()
	  #24 0x00000000 in ?? ()
	  #25 0xc01fbe54 in ip_input (m=0xc0ffca00) at
	  /usr/src/sys/netinet/ip_input.c:749
	  #26 0xc01fb997 in ip_input_handler (msg0=0xc0e64ec0) at
	  /usr/src/sys/netinet/ip_input.c:455
	  #27 0xc01eac55 in netmsg_service_loop (arg=0x0) at
	  /usr/src/sys/net/netisr.c:200
	  #28 0xc019fe08 in lwkt_create () at
	  /usr/src/sys/kern/lwkt_thread.c:1260
	  (kgdb) up 25
	  #25 0xc01fbe54 in ip_input (m=0xc0ffca00) at
	  /usr/src/sys/netinet/ip_input.c:749
	  749                     TAILQ_FOREACH(ifa,
	  &m->m_pkthdr.rcvif->if_addrhead, ifa_link) {
	  (kgdb) list
	  744              * interface.  Reception of forwarded directed
	  broadcasts would
	  745              * be handled via ip_forward() and ether_output()
	  with the loopback
	  746              * into the stack for SIMPLEX interfaces handled
	  by ether_output().
	  747              */
	  748             if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
	  749                     TAILQ_FOREACH(ifa,
	  &m->m_pkthdr.rcvif->if_addrhead, ifa_link) {
	  750                             if (ifa->ifa_addr->sa_family !=
	  AF_INET)
	  751                                     continue;
	  752                             ia = ifatoia(ifa);
	  753                             if
	  (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
	  (kgdb) print ifa
	  $1 = (struct ifaddr *) 0x0
	  (kgdb) 

jm
--
I love feminist movements, especially when I'm walking behind them.