Re: Fatal trap 18: integer divide fault while in kernel mode

On Wednesday 04 January 2006 12:41 pm, Alexander Leidinger wrote:
> On Wed, 4 Jan 2006 06:51:18 -1000
>
> Randy Bush <randy_at_psg.com> wrote:
> > Fatal trap 18: integer divide fault while in kernel mode
> > cpuid = 0; apic id = 00
> > instruction pointer     = 0x20:0xc05e6295
> > stack pointer           = 0x28:0xc0820d04
> > frame pointer           = 0x28:0xc0820d14
> > 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         = 0 ()
> > [thread pid 0 tid 0 ]
> > Stopped at      vm_coloring_init+0x35:  idivl   pq_cachenways,%eax
> > db> trace
> > Tracing pid 0 tid 0 td 0xc0692660
> > vm_coloring_init(3,c0820d60,c05e156a,c069d7a4,c065ad0e) at
> > vm_coloring_init+0x35 vm_pageq_init(c069d7a4,c065ad0e,0,1,c04caf4b) at
> > vm_pageq_init+0x9 vm_page_startup(c0c3d000,a,c0820d88,c049dbf5,0) at
> > vm_page_startup+0x10a vm_mem_init(0,81e000,81ec00,81e000,0) at
> > vm_mem_init+0x18
> > mi_startup() at mi_startup+0xb5
> > begin() at begin+0x2c
>
> Uhm... this looks like my fault...
>
> Can you please try the attached diff and report back if it works?
>
> If it doesn't work I need more debugging output:
>  - the content of pq_cachesize and pq_cachenways
>  - the line where it's panicing

You should probably CTASSERT(PAGE_SIZE/1024 > 0).  That should probably never 
be false.

-- 
John Baldwin <jhb_at_FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org