umass causes panic on 7 amd64

[Roland Smith]

On Wed, Apr 16, 2008 at 09:10:23AM -0700, Steve Franks wrote:
> 
> 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:
> 
> Best,
> Steve
> 
> [steve at 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 conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "amd64-marcel-freebsd".
> 
> Unread portion of the kernel message buffer:
> 
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x0
> fault code              = supervisor read instruction, page not present
> instruction pointer     = 0x8:0x0
> stack pointer           = 0x10:0xffffffffa0208570
> frame pointer           = 0x10:0xffffff0001e1ca00
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 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             = 12
> panic: page fault
> cpuid = 0
> Uptime: 32s
> Physical memory: 1002 MB
> Dumping 96 MB: 81 65 49 33 17
> 
> #0  doadump () at pcpu.h:194
> 194             __asm __volatile("movq %%gs:0,%0" : "=r" (td));
> (kgdb)

If you give the 'bt' command (backtrace) here, what does it say?

Roland
-- 
R.F.Smith                                   http://www.xs4all.nl/~rsmith/
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