Re: Fatal trap 12

Peter Schultz wrote:
> I think he's going to have to do full-blown kernel debugging in order 
> for anyone to be able to help.  These fatal trap 12s are tricky.

Here is an extact from gdb..


(kgdb) up 7
#7  0xc0568fe6 in sysctl_iflist (af=0, w=0xe40a1b9c) at 
/usr/src/sys/net/rtsock.c:981
981                     len = rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w);
(kgdb) print info
$1 = {rti_addrs = 16, rti_info = {0x0, 0x0, 0x0, 0x0, 0xff70ff70, 0x0, 
0x0, 0x0}, rti_flags = 0, rti_ifa = 0x0, rti_ifp = 0x0}
(kgdb) print w
$2 = (struct walkarg *) 0xe40a1b9c
(kgdb) print *w
$3 = {w_tmemsize = 152, w_op = 3, w_arg = 0, w_tmem = 0xc6850100 "\230", 
w_req = 0xe40a1c10}



and here is the full gdb session..


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0xff70ff70
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc0568949
stack pointer           = 0x10:0xe40a1b04
frame pointer           = 0x10:0xe40a1b28
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         = 303 (ifconfig)
trap number             = 12
panic: page fault
cpuid = 0;
boot() called on cpu#0

syncing disks, buffers remaining... 218 218 216 216 215 215 215 215 215 
215 215 215 215 215 215 215 215 215 215 215 215 215 215 215
giving up on 200 buffers
Uptime: 46s
Dumping 1023 MB
  16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256 272 288 304 
320 336 352 368 384 400 416 432 448 464 480 496 512 528 544 560 576 592 
608 624 640 656 672 688 704 720 736 752 768 784 800 816 832 848 864 880 
896 912 928 944 960 976 992 1008
---
Reading symbols from 
/usr/obj/usr/src/sys/WEB/modules/usr/src/sys/modules/acpi/acpi.ko.debug...done.
Loaded symbols for 
/usr/obj/usr/src/sys/WEB/modules/usr/src/sys/modules/acpi/acpi.ko.debug
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
240             dumping++;
(kgdb) bt
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1  0xc04f1791 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:372
#2  0xc04f1b6e in panic () at /usr/src/sys/kern/kern_shutdown.c:550
#3  0xc062547c in trap_fatal (frame=0xe40a1ac4, eva=0) at 
/usr/src/sys/i386/i386/trap.c:821
#4  0xc0625122 in trap_pfault (frame=0xe40a1ac4, usermode=0, 
eva=4285595504) at /usr/src/sys/i386/i386/trap.c:735
#5  0xc0624d33 in trap (frame=
       {tf_fs = 24, tf_es = -1066860528, tf_ds = 16, tf_edi = 0, tf_esi 
= 4, tf_ebp = -469099736, tf_isp = -469099792, tf_ebx = -964638720, 
tf_edx = -9371792, tf_ecx = -469099704, tf_eax = 16, tf_trapno = 12, 
tf_err = 0, tf_eip = -1068070583, tf_cs = 8, tf_eflags = 66050, tf_esp = 
-967258976, tf_ss = -964361888})
     at /usr/src/sys/i386/i386/trap.c:420
#6  0xc0611f28 in calltrap () at {standard input}:94
#7  0xc0568fe6 in sysctl_iflist (af=0, w=0xe40a1b9c) at 
/usr/src/sys/net/rtsock.c:981
#8  0xc056943e in sysctl_rtsock (oidp=0xc0694b00, arg1=0xe40a1cb4, 
arg2=4, req=0xe40a1c10) at /usr/src/sys/net/rtsock.c:1132
#9  0xc04fb89a in sysctl_root (oidp=0x0, arg1=0x16, arg2=-469099504, 
req=0xe40a1cb8) at /usr/src/sys/kern/kern_sysctl.c:1179
#10 0xc04fbb4d in userland_sysctl (td=0x0, name=0xe40a1cac, namelen=6, 
old=0xe40a1c10, oldlenp=0xe40a1cb8, inkernel=0, new=0x16, newlen=0,
     retval=0xe40a1ca8) at /usr/src/sys/kern/kern_sysctl.c:1286
#11 0xc04fb980 in __sysctl (td=0x0, uap=0xe40a1d14) at 
/usr/src/sys/kern/kern_sysctl.c:1216
#12 0xc06257e0 in syscall (frame=
       {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 0, tf_esi = 
-1077940636, tf_ebp = -1077940728, tf_isp = -469099148, tf_ebx = 
672416032, tf_edx = 0, tf_ecx = -1077940632, tf_eax = 202, tf_trapno = 
12, tf_err = 2, tf_eip = 671908719, tf_cs = 31, tf_eflags = 663, tf_esp 
= -1077940772, tf_ss = 47})
     at /usr/src/sys/i386/i386/trap.c:1010
#13 0xc0611f7d in Xint0x80_syscall () at {standard input}:136
---Can't read userspace from dump, or kernel process---

(kgdb) up 7
#7  0xc0568fe6 in sysctl_iflist (af=0, w=0xe40a1b9c) at 
/usr/src/sys/net/rtsock.c:981
981                     len = rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w);
(kgdb) print info
$1 = {rti_addrs = 16, rti_info = {0x0, 0x0, 0x0, 0x0, 0xff70ff70, 0x0, 
0x0, 0x0}, rti_flags = 0, rti_ifa = 0x0, rti_ifp = 0x0}
(kgdb) print w
$2 = (struct walkarg *) 0xe40a1b9c
(kgdb) print *w
$3 = {w_tmemsize = 152, w_op = 3, w_arg = 0, w_tmem = 0xc6850100 "\230", 
w_req = 0xe40a1c10}

-- 
               Roberto Nunnari -software engineer-
                mailto:roberto.nunnari_at_supsi.ch
  Scuola Universitaria Professionale della Svizzera Italiana
              Dipartimento Tecnologie Innovative
                   http://www.dti.supsi.ch
  SUPSI-DTI
  Via Cantonale                        tel: +41-91-6108561
  6928 Manno                 """       fax: +41-91-6108570
  Switzerland               (o o)
=======================oOO==(_)==OOo========================