Date: Tue, 12 Apr 2005 09:04:38 -0700 (PDT) From: Doug White <dwhite@gumbysoft.com> To: Kirill Ponomarew <krion@voodoo.oberon.net> Cc: freebsd-stable@FreeBSD.org Subject: Re: 4.11R panics Message-ID: <20050412090310.Q2178@carver.gumbysoft.com> In-Reply-To: <20050410070638.GB38785@voodoo.oberon.net> References: <20050406084615.GF15165@voodoo.oberon.net> <20050410070638.GB38785@voodoo.oberon.net>
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On Sun, 10 Apr 2005, Kirill Ponomarew wrote:
> On Fri, Apr 08, 2005 at 10:14:17AM -0700, Doug White wrote:
> > > Fatal trap 12: page fault while in kernel mode
> > > fault virtual address = 0x20202020
> >
> > Hm, something ran into a bunch of ASCII spaces..
> >
> > Can you jump to frame #6 and print *kbp? It appears the kernel malloc
> > bucket list is corrupted, so I'm curious just how badly that struct is
> > spammed.
>
> #0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:487
> 487 if (dumping++) {
> (kgdb) up 6
> #6 0xc0193533 in malloc (size=324, type=0xc030d780, flags=9)
> at /usr/src/sys/kern/kern_malloc.c:243
> 243 va = kbp->kb_next;
> (kgdb) print *kbp
> $1 = {kb_next = 0x20202020 <Address 0x20202020 out of bounds>,
> kb_last = 0xcc8fa000 "", kb_calls = 5704, kb_total = 448, kb_elmpercl = 8,
> kb_totalfree = 13, kb_highwat = 40, kb_couldfree = 0}
Not very, apparently.
Dunno what to say ... I'd guess something coughed up a bad address to a
DMA op or something and it just happened to land there. If you can
reproduce this with any sort of regularity there might be a bug, although
that seems unlikely since that code hasn't changed in years and this is
the first such report I've seen of this :)
--
Doug White | FreeBSD: The Power to Serve
dwhite@gumbysoft.com | www.FreeBSD.org
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