Date: Mon, 31 Jan 2011 09:10:21 -0800 From: Julian Elischer <julian@freebsd.org> To: Przemyslaw Frasunek <przemyslaw@frasunek.com> Cc: freebsd-net@freebsd.org, Alexander Motin <mav@freebsd.org> Subject: Re: Netgraph/mpd5 stability issues Message-ID: <4D46ECFD.2070700@freebsd.org> In-Reply-To: <4D46EA1E.4020000@freebsd.org> References: <4D3011DB.9050900@frasunek.com> <20110131144223.GN62007@FreeBSD.org> <4D46D19A.7000508@frasunek.com> <4D46EA1E.4020000@freebsd.org>
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On 1/31/11 8:58 AM, Julian Elischer wrote:
> On 1/31/11 7:13 AM, Przemyslaw Frasunek wrote:
>>> And in this one, can you please show *hook->hk_peer ?
>> (kgdb) print *hook->hk_peer
>> $2 = {
>> hk_name = "\b\000\000\000
>> \000\000\000\004\000\000\000\001\000\000\000ŐRí\003\003ö\0248cmd4\000\000\000",
>>
>> hk_private = 0x0, hk_flags = 0, hk_refs = 0,
>> hk_type = 0, hk_peer = 0x0, hk_node = 0x0, hk_hooks = {le_next =
>> 0x566226,
>> le_prev = 0x99e79c03}, hk_rcvmsg = 0x38ef45, hk_rcvdata =
>> 0x28d6a8a1}
>
> that's not supposed to be able to happen.
> It's supposed to point to SOMETHING, even if it's the "dead" hook.
> does the dead hook point to itself? itprobably should if it doesn't.
> (and it should have a name of 'dead' if it doesn't already).
Replying to self.. all these things are in fact true, (just looked at
source) so this is not a pointer
to the dead node. So, how do we get a NULL peer?
unless the hook is destroyed by another thread while we are accessing it,
but I think from memory that that should set it to 'dead' not NULL.
>
>
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