Date: Fri, 8 Jan 2010 08:26:05 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au> Subject: Re: Fatal trap 12: page fault while in kernel mode [SEC=UNCLASSIFIED] Message-ID: <201001080826.05461.jhb@freebsd.org> In-Reply-To: <20100108061951.GA47507@stlux503.dsto.defence.gov.au> References: <20100105060748.GA16239@stlux503.dsto.defence.gov.au> <201001070935.52783.jhb@freebsd.org> <20100108061951.GA47507@stlux503.dsto.defence.gov.au>
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On Friday 08 January 2010 1:19:51 am Wilkinson, Alex wrote:
>
> 0n Thu, Jan 07, 2010 at 09:35:52AM -0500, John Baldwin wrote:
>
> >Can you go to frame 9 and do 'p rv', 'p mpred', and 'p *mpred'? Can
you also do 'p vm_reserv_array'
>
> (kgdb) up 9
> #9 0xc0b04452 in vm_reserv_alloc_page (object=0xc207c000, pindex=28795) at
/usr/src/sys/vm/vm_reserv.c:320
> 320 if (rv->object == object && vm_reserv_has_pindex(rv, pindex)) {
> (kgdb) p rv
> $1 = 0xc445d060
> (kgdb) p *mpred
> $2 = {pageq = {tqe_next = 0xc75bb360, tqe_prev = 0xc75bb000}, listq =
{tqe_next = 0xc75bb360, tqe_prev = 0xc8595170}, left = 0xc7612a20, right =
0xcb721d80, object = 0xc207c000,
> pindex = 28989, phys_addr = 3876835328, md = {pv_list = {tqh_first = 0x0,
tqh_last = 0x0}, pat_mode = 1}, queue = 0 '\0', segind = 0 '\0', flags = 152,
order = 0 '\0', pool = 0 '\0',
> cow = 0, wire_count = 1, hold_count = 0, oflags = 0, act_count = 0 '\0',
busy = 0 '\0', valid = 255 'ÿ', dirty = 255 'ÿ'}
> (kgdb) p vm_reserv_array
> $3 = 0xc4454000
> (kgdb)
Can you add a printf to vm_reserv_startup() to print out the size it
calculates and then boot a kernel with that and reply with the size it
computes?
--
John Baldwin
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