Date: Thu, 30 Apr 2009 13:29:06 -0700 From: David Wolfskill <david@catwhisker.org> To: Jung-uk Kim <jkim@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: Panic "Fatal trap 18: integer divide fault while in kernel mode" Message-ID: <20090430202906.GE1387@albert.catwhisker.org> In-Reply-To: <200904301552.03118.jkim@FreeBSD.org> References: <20090429161626.GQ1387@albert.catwhisker.org> <49F9CD25.70102@icyb.net.ua> <a31046fc0904300937q6483002fy124ed918962c925c@mail.gmail.com> <200904301552.03118.jkim@FreeBSD.org>
next in thread | previous in thread | raw e-mail | index | archive | help
--UoQnh8DjDgfWLrgi
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Thu, Apr 30, 2009 at 03:51:59PM -0400, Jung-uk Kim wrote:
> ...
> > >> db> bt
> > >> Tracing pid 0 tid 100000 td 0xc0d43610
> > >> cpu_topo(2,c1420d34,c081ff07,c1420d58,c0820042,...) at
> > >> cpu_topo+0x43 smp_topo(c0804378,2,c4145a5c,fffffff,0,...) at
> > >> smp_topo+0x10b
> > >> sched_setup(0,141ec00,141ec00,141e000,1425000,...) at
> > >> sched_setup+0x1a mi_startup() at mi_startup+0x96
> > >> begin() at begin+0x2c
> > >
> > > My guess is that (cpu_cores * cpu_logical) somehow equals to
> > > zero.
> >
> > That was masked earlier by additional checks on zero,
> > and now that routine moved to the separate function
> > (and to separate call path from subr_smp.c:mp_start()
> > which seems not to be called).
> >
> > > Have you by a chance saved this crash dump?
> > > I think that t would be interesting to look at it in kgdb.
I was unable to save a dump; sorry -- "panic" merely sat there. Since
the kernel had yet to have probed any devices (that I can tell), that
may have had something to do with it.
> Please try the attached patch.
>=20
> Jung-uk Kim
> --- sys/amd64/amd64/mp_machdep.c (revision 191699)
> +++ sys/amd64/amd64/mp_machdep.c (working copy)
> @@ -214,6 +214,8 @@
> else if (type =3D=3D CPUID_TYPE_CORE)
> cpu_cores =3D cnt;
> }
> + if (cpu_cores =3D=3D 0)
> + cpu_cores =3D 1;
> if (cpu_logical =3D=3D 0)
> cpu_logical =3D 1;
> cpu_cores /=3D cpu_logical;
> --- sys/i386/i386/mp_machdep.c (revision 191699)
> +++ sys/i386/i386/mp_machdep.c (working copy)
> @@ -267,6 +267,8 @@
> else if (type =3D=3D CPUID_TYPE_CORE)
> cpu_cores =3D cnt;
> }
> + if (cpu_cores =3D=3D 0)
> + cpu_cores =3D 1;
> if (cpu_logical =3D=3D 0)
> cpu_logical =3D 1;
> cpu_cores /=3D cpu_logical;
OK; I tried, but the symptoms appear unchanged:
=2E..
=B3 Select option, [Enter] for default =B3
=B3 or [Space] to pause timer 9 =B3
=C0=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=
=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=C4=D9
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 #1027 r191682M: Thu Apr 30 13:19:50 PDT 2009
root@d254.dwolf.juniper.net.:/common/S4/obj/usr/src/sys/CANARY
WARNING: WITNESS option enabled, expect reduced performance.
Preloaded elf kernel "/boot/kernel/kernel" at 0xc1131000.
Preloaded elf module "/boot/kernel/linux.ko" at 0xc113114c.
Preloaded elf module "/boot/kernel/if_an.ko" at 0xc11311f8.
Preloaded elf module "/boot/kernel/if_wi.ko" at 0xc11312a4.
Preloaded elf module "/boot/kernel/radeon.ko" at 0xc1131350.
Preloaded elf module "/boot/kernel/drm.ko" at 0xc11313fc.
Timecounter "i8254" frequency 1193182 Hz quality 0
Calibrating TSC clock ... TSC clock: 2392953980 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 769626112 (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 0x20:0xc0b3c9f3
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> bt
Tracing pid 0 tid 100000 td 0xc0d43690
cpu_topo(2,c1420d34,c081ff07,c1420d58,c0820042,...) at cpu_topo+0x43
smp_topo(c0804378,2,c4145a5c,fffffff,0,...) at smp_topo+0x10b
sched_setup(0,141ec00,141ec00,141e000,1425000,...) at sched_setup+0x1a
mi_startup() at mi_startup+0x96
begin() at begin+0x2c
db>=20
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.
--UoQnh8DjDgfWLrgi
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.11 (FreeBSD)
iEYEARECAAYFAkn6ChIACgkQmprOCmdXAD1PlgCffzZPMOmMbQ3jSIRcmftDugps
gKAAmwb4diY5gkvxXN8eKdUp/tM8t8y2
=LryZ
-----END PGP SIGNATURE-----
--UoQnh8DjDgfWLrgi--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090430202906.GE1387>