Date: Wed, 16 Apr 2008 18:19:00 +0200 From: Roland Smith <rsmith@xs4all.nl> To: Steve Franks <stevefranks@ieee.org> Cc: freebsd-stable@freebsd.org Subject: Re: umass causes panic on 7 amd64 Message-ID: <20080416161900.GA64156@slackbox.xs4all.nl> In-Reply-To: <539c60b90804160910q3a242d7amb474b40065d6c9c6@mail.gmail.com> References: <539c60b90804111420kcb73e6do8a20dce574d13864@mail.gmail.com> <20080412213225.GB24224@slackbox.xs4all.nl> <539c60b90804141549u6a138ad9u9c77bbfcbbad0ff3@mail.gmail.com> <20080415175347.GA29045@slackbox.xs4all.nl> <539c60b90804151134q7a25a141m1205a1b04d8ffc2c@mail.gmail.com> <20080415192028.GA31706@slackbox.xs4all.nl> <539c60b90804160910q3a242d7amb474b40065d6c9c6@mail.gmail.com>
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On Wed, Apr 16, 2008 at 09:10:23AM -0700, Steve Franks wrote:
>=20
> freebsd-stable: as you can see, Roland has been teaching me about
> crashdumps since my umass brought down one system, and is rather
> unusable on another. Here's the kgdb output:
>=20
> Best,
> Steve
>=20
> [steve@dystant /usr/obj/usr/src/sys/GENERIC]$ sudo kgdb kernel.debug
> /var/crash/vmcore.3
> [GDB will not be able to debug user-mode threads:
> /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you =
are
> welcome to change it and/or distribute copies of it under certain conditi=
ons.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. Type "show warranty" for detail=
s.
> This GDB was configured as "amd64-marcel-freebsd".
>=20
> Unread portion of the kernel message buffer:
>=20
>=20
> Fatal trap 12: page fault while in kernel mode
> cpuid =3D 0; apic id =3D 00
> fault virtual address =3D 0x0
> fault code =3D supervisor read instruction, page not present
> instruction pointer =3D 0x8:0x0
> stack pointer =3D 0x10:0xffffffffa0208570
> frame pointer =3D 0x10:0xffffff0001e1ca00
> code segment =3D base 0x0, limit 0xfffff, type 0x1b
> =3D DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags =3D interrupt enabled, resume, IOPL =3D 0
> current process =3D 12 (swi4: clock sio)
Odd. This doesn't seem to have anything to do with usb. It is in a
kernel thread that runs the clock and serial port.
> trap number =3D 12
> panic: page fault
> cpuid =3D 0
> Uptime: 32s
> Physical memory: 1002 MB
> Dumping 96 MB: 81 65 49 33 17
>=20
> #0 doadump () at pcpu.h:194
> 194 __asm __volatile("movq %%gs:0,%0" : "=3Dr" (td));
> (kgdb)
If you give the 'bt' command (backtrace) here, what does it say?
Roland
--=20
R.F.Smith http://www.xs4all.nl/~rsmith/
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