Date: Tue, 1 Feb 2011 08:17:04 -0500 From: John Baldwin <jhb@freebsd.org> To: Eugene Grosbein <egrosbein@rdtc.ru> Cc: freebsd-net@freebsd.org Subject: Re: panic: bufwrite: buffer is not busy??? Message-ID: <201102010817.04927.jhb@freebsd.org> In-Reply-To: <4D479FE0.70809@rdtc.ru> References: <4D3011DB.9050900@frasunek.com> <201101311146.43119.jhb@freebsd.org> <4D479FE0.70809@rdtc.ru>
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On Tuesday, February 01, 2011 12:53:36 am Eugene Grosbein wrote:
> On 31.01.2011 22:46, John Baldwin wrote:
>
> >># gdb kernel
> >> 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"...
> >> (gdb) l *0xffffffff803c1315
> >> 0xffffffff803c1315 is in ng_address_hook
> > (/home/src/sys/netgraph/ng_base.c:3504).
> >> 3499 * Quick sanity check..
> >> 3500 * Since a hook holds a reference on it's node, once we know
> >> 3501 * that the peer is still connected (even if invalid,) we
> > know
> >> 3502 * that the peer node is present, though maybe invalid.
> >> 3503 */
> >> 3504 if ((hook == NULL) ||
> >> 3505 NG_HOOK_NOT_VALID(hook) ||
> >> 3506 NG_HOOK_NOT_VALID(peer = NG_HOOK_PEER(hook)) ||
> >> 3507 NG_NODE_NOT_VALID(peernode = NG_PEER_NODE(hook))) {
> >> 3508 NG_FREE_ITEM(item);
> >
> > Hmmm. I think you might have a hardware problem. Notice the fault address,
> > it is 0x200000030. Can you do 'x/i <instruction pointer>'?
>
> (gdb) x/i 0xffffffff803c1315
> 0xffffffff803c1315 <ng_address_hook+37>: testb $0x1,0x28(%rdx)
Hmm, offset is 0x28, so the original pointer would have been 0x200000008,
which has two bits set. That is a bit more of a stretch.
--
John Baldwin
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