Date: Tue, 6 Aug 2002 20:59:00 -0400 From: "Scott M. Nolde" <scott@smnolde.com> To: freebsd-ipfw@freebsd.org, freebsd-hackers@freebsd.org Subject: kernel backtrace after panic - dummynet? Message-ID: <20020806205900.D370@smnolde.com>
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I've just had a 4.6-stable box (my firewall reboot) and I've been able to
capture a backtrace with gdb. If someone would please offer some
assistance I'd appreciate this. Sorry about the crossposts.
Disclaimer: I'm not a coder, but I hope to learn something from this.
I've added debugging symbols into the kernel in hopes of catching just
this.
System: FreeBSD gw.smnolde.com 4.6-STABLE FreeBSD 4.6-STABLE #4: Tue Aug
6 14:10:57 EDT 2002 root@gw.smnolde.com:/usr/obj/usr/src/sys/FIREWALL
i386
Sorry for any flood, but here's the data from gdb:
This GDB was configured as "i386-unknown-freebsd"...
IdlePTD at phsyical address 0x003fc000
initial pcb at physical address 0x0034f900
panicstr: integer divide fault
panic messages:
---
Fatal trap 18: integer divide fault while in kernel mode
instruction pointer = 0x8:0xc02d5b06
stack pointer = 0x10:0xc8f70a4c
frame pointer = 0x10:0xc8f70ab8
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 591 (natd)
interrupt mask = net tty
trap number = 18
panic: integer divide fault
syncing disks... 4
done
Uptime: 1h45m43s
dumping to dev #da/0x20001, offset 536576
dump 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112
111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91
90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66
65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41
40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
#0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:487
487 if (dumping++) {
(kgdb) where
#0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:487
#1 0xc018f3f7 in boot (howto=256) at
/usr/src/sys/kern/kern_shutdown.c:316
#2 0xc018f835 in panic (fmt=0xc03198cc "%s") at
/usr/src/sys/kern/kern_shutdown.c:595
#3 0xc02be0e7 in trap_fatal (frame=0xc8f70a0c, eva=0) at
/usr/src/sys/i386/i386/trap.c:974
#4 0xc02bda9e in trap (frame={tf_fs = 16, tf_es = 16, tf_ds = 16, tf_edi
= -1056562568, tf_esi = 0,
tf_ebp = -923333960, tf_isp = -923334088, tf_ebx = 3932160, tf_edx =
0, tf_ecx = 0, tf_eax = 1, tf_trapno = 18,
tf_err = 0, tf_eip = -1070769402, tf_cs = 8, tf_eflags = 66118,
tf_esp = 0, tf_ss = -1055003648})
at /usr/src/sys/i386/i386/trap.c:636
#5 0xc02d5b06 in __qdivrem (uq=3932160, vq=0, arq=0x0) at
/usr/src/sys/libkern/qdivrem.c:100
#6 0xc02d5ee6 in __udivdi3 (a=3932160, b=0) at
/usr/src/sys/libkern/udivdi3.c:50
#7 0xc01e507f in dummynet_io (m=0xc0b47500, pipe_nr=1, dir=1,
fwa=0xc8f70ba8)
at /usr/src/sys/netinet/ip_dummynet.c:1205
#8 0xc01ec13e in ip_output (m0=0xc0b47500, opt=0x0, ro=0xc8771ed8,
flags=0, imo=0x0)
at /usr/src/sys/netinet/ip_output.c:626
#9 0xc01f4ec5 in syncache_respond (sc=0xc8771ea0, m=0xc0b47500) at
/usr/src/sys/netinet/tcp_syncache.c:1196
#10 0xc01f4b15 in syncache_add (inc=0xc8f70cd4, to=0xc8f70d40,
th=0xc0b475d8, sop=0xc8f70cd0, m=0xc0b47500)
at /usr/src/sys/netinet/tcp_syncache.c:1011
#11 0xc01ef52d in tcp_input (m=0xc0b47500, off0=20, proto=6) at
/usr/src/sys/netinet/tcp_input.c:831
#12 0xc01ea530 in ip_input (m=0xc8f70dfc) at
/usr/src/sys/netinet/ip_input.c:821
#13 0xc01e36c3 in div_output (so=0xc85a6e00, m=0xc0b47500, sin=0xc1129710,
control=0x0)
at /usr/src/sys/netinet/ip_divert.c:327
#14 0xc01e3863 in div_send (so=0xc85a6e00, flags=0, m=0xc0b47500,
nam=0xc1129710, control=0x0, p=0xc7fb52a0)
at /usr/src/sys/netinet/ip_divert.c:440
#15 0xc01adc87 in sosend (so=0xc85a6e00, addr=0xc1129710, uio=0xc8f70ecc,
top=0xc0b47500, control=0x0, flags=0,
p=0xc7fb52a0) at /usr/src/sys/kern/uipc_socket.c:609
#16 0xc01b1057 in sendit (p=0xc7fb52a0, s=3, mp=0xc8f70f0c, flags=0) at
/usr/src/sys/kern/uipc_syscalls.c:585
#17 0xc01b115a in sendto (p=0xc7fb52a0, uap=0xc8f70f80) at
/usr/src/sys/kern/uipc_syscalls.c:638
#18 0xc02be39d in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
tf_edi = 1, tf_esi = -1078002568,
tf_ebp = -1077937032, tf_isp = -923332652, tf_ebx = 60, tf_edx =
134811904, tf_ecx = 1, tf_eax = 133,
tf_trapno = 7, tf_err = 2, tf_eip = 134551080, tf_cs = 31, tf_eflags
= 647, tf_esp = -1078002740, tf_ss = 47})
at /usr/src/sys/i386/i386/trap.c:1175
#19 0xc02af2e5 in Xint0x80_syscall ()
#20 0x8048837 in ?? ()
#21 0x8048137 in ?? ()
--
Scott Nolde
GPG Key 0xD869AB48
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