Date: Wed, 29 Apr 2009 09:16:26 -0700 From: David Wolfskill <david@catwhisker.org> To: current@freebsd.org Subject: Panic "Fatal trap 18: integer divide fault while in kernel mode" Message-ID: <20090429161626.GQ1387@albert.catwhisker.org>
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My build machine had no trouble building & booting r191662, but my
laptop's boot came to a screeching halt rather quickly. Here's
cut/paste for serial console of the single-user mode boot sequence:
GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
SMAP type=3D01 base=3D0000000000000000 len=3D000000000009fc00
SMAP type=3D02 base=3D000000000009fc00 len=3D0000000000000400
SMAP type=3D01 base=3D0000000000100000 len=3D000000002fee2800
SMAP type=3D02 base=3D000000002ffe2800 len=3D000000000001d800
SMAP type=3D02 base=3D00000000feda0000 len=3D0000000000060000
SMAP type=3D02 base=3D00000000ffb80000 len=3D0000000000480000
Copyright (c) 1992-2009 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.0-CURRENT #1025 r191662: Wed Apr 29 08:28:59 PDT 2009
root@g1-37.catwhisker.org:/common/S4/obj/usr/src/sys/CANARY
WARNING: WITNESS option enabled, expect reduced performance.
Preloaded elf kernel "/boot/kernel/kernel" at 0xc1125000.
Preloaded elf module "/boot/kernel/linux.ko" at 0xc112514c.
Preloaded elf module "/boot/kernel/if_an.ko" at 0xc11251f8.
Preloaded elf module "/boot/kernel/if_wi.ko" at 0xc11252a4.
Preloaded elf module "/boot/kernel/radeon.ko" at 0xc1125350.
Preloaded elf module "/boot/kernel/drm.ko" at 0xc11253fc.
Timecounter "i8254" frequency 1193182 Hz quality 0
Calibrating TSC clock ... TSC clock: 2392949196 Hz
CPU: Mobile Intel(R) Pentium(R) 4 - M CPU 2.40GHz (2392.95-MHz 686-class CP=
U)
Origin =3D "GenuineIntel" Id =3D 0xf27 Stepping =3D 7
Features=3D0xbfebf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA=
,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=3D0x400<CNXT-ID>
Instruction TLB: 4 KB, 2 MB or 4 MB pages, fully associative, 128 entries
Data TLB: 4 KB or 4 MB pages, fully associative, 64 entries
1st-level data cache: 8 KB, 4-way set associative, sectored cache, 64 byte =
line size
Trace cache: 12K-uops, 8-way set associative
2nd-level cache: 512 KB, 8-way set associative, sectored cache, 64 byte lin=
e size
real memory =3D 805306368 (768 MB)
Physical memory chunk(s):
0x0000000000001000 - 0x000000000009efff, 647168 bytes (158 pages)
0x0000000000100000 - 0x00000000003fffff, 3145728 bytes (768 pages)
0x0000000001425000 - 0x000000002f2d9fff, 770396160 bytes (188085 pages)
avail memory =3D 769642496 (733 MB)
bios32: Found BIOS32 Service Directory header at 0xc00ffe80
bios32: Entry =3D 0xffe90 (c00ffe90) Rev =3D 0 Len =3D 1
pcibios: PCI BIOS entry at 0xf0000+0xbfee
pnpbios: Found PnP BIOS data at 0xc00fe2d0
pnpbios: Entry =3D f0000:e2f4 Rev =3D 1.0
pnpbios: Event flag at 4b4
Other BIOS signatures found:
Fatal trap 18: integer divide fault while in kernel mode
cpuid =3D 0; apic id =3D 00
instruction pointer =3D 0x20:0xc0b34433
stack pointer =3D 0x28:0xc1420d00
frame pointer =3D 0x28:0xc1420d20
code segment =3D base 0x0, limit 0xfffff, type 0x1b
=3D DPL 0, pres 1, def32 1, gran 1
processor eflags =3D interrupt enabled, resume, IOPL =3D 0
current process =3D 0 (swapper)
[thread pid 0 tid 100000 ]
Stopped at cpu_topo+0x43: idivl %ecx,%eax
db>=20
[Note: I've been in the habit of tracking head/CURRENT on a daily basis,
and had no problems building today's while running yesterday's, which
was r1916?? -- sorry; looks as if I'll need to boot from a different
kernel to get that info. (I've already powered off my build machine,
and it's at home, while I'm at work.)]
Is there anything of use I might get from DDB?
Peace,
david
--=20
David H. Wolfskill david@catwhisker.org
Depriving a girl or boy of an opportunity for education is evil.
See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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