Date: Mon, 24 Sep 2001 19:41:02 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: Peter Wemm <peter@wemm.org> Cc: Ian Dowse <iedowse@maths.tcd.ie>, Julian Elischer <julian@elischer.org>, hackers@FreeBSD.ORG Subject: Re: VM Corruption - stumped, anyone have any ideas? Message-ID: <200109250241.f8P2f2p98637@earth.backplane.com> References: <20010925012743.43E583808@overcee.netplex.com.au>
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:I did it as part of the KSE work in 5.x. It would be quite easy to do it
:for 4.x as well, but it makes a.out coredumps problematic.
:
:Also, "options UPAGES=4" is a pretty good defensive measure.
:
:Cheers,
:-Peter
:--
:Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
Well, in 4.x:
(kgdb) print p->p_addr
$6 = (struct user *) 0xcb7b9000
(kgdb) print &p->p_addr->u_sigacts
$7 = (struct sigacts *) 0xcb7b9260
(kgdb) print &p->p_addr->u_stats
$8 = (struct pstats *) 0xcb7b9cd0
(kgdb) print &p->p_addr->u_kproc
$9 = (struct kinfo_proc *) 0xcb7b9db0
(kgdb) print &p->p_addr->u_md
$10 = (struct md_coredump *) 0xcb7ba1d0
(kgdb) print &p->p_addr->u_guard (my new field)
$11 = (u_int32_t *) 0xcb7ba1d0
(kgdb)
cb7b9000 start of kstack
cb7ba1d4 end of struct user
cb7bb000 top of kstack
Leaving us 3628 bytes for the kernel stack.
Something really weird is going on... I added u_guard to the end
of the struct user structure and there are two or three processes
hitting the guard immediately. All the rest are ok. I'm going
to investigate further but this is very odd. Am I missing something
about the UAREA?
-Matt
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