netdev - Re: [PATCH 1/4] IPv6: keep route for tentative address

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Message-ID: <AANLkTin3CfATS0-ePL5WUSiuq0seRCQgM6xc-YwxpPEy@mail.gmail.com>
Date:	Fri, 21 May 2010 15:21:44 -0700
From:	Emil S Tantilov <emils.tantilov@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>,
	"David S. Miller" <davem@...emloft.net>,
	NetDev <netdev@...r.kernel.org>
Cc:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
Subject: Re: [PATCH 1/4] IPv6: keep route for tentative address

On Mon, Apr 12, 2010 at 1:17 PM, Tantilov, Emil S
<emil.s.tantilov@...el.com> wrote:
> Stephen Hemminger wrote:
>> Recent changes preserve IPv6 address when link goes down (good).
>> But would cause address to point to dead dst entry (bad).
>> The simplest fix is to just not delete route if address is
>> being held for later use.
>>
>> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
>>
>>
>> --- a/net/ipv6/addrconf.c     2010-04-11 12:19:37.938082190 -0700
>> +++ b/net/ipv6/addrconf.c     2010-04-11 12:25:05.349309074 -0700
>> @@ -4046,7 +4046,8 @@ static void __ipv6_ifa_notify(int event,
>>                       addrconf_leave_anycast(ifp);
>>               addrconf_leave_solict(ifp->idev, &ifp->addr);
>>               dst_hold(&ifp->rt->u.dst);
>> -             if (ip6_del_rt(ifp->rt))
>> +
>> +             if (ifp->dead && ip6_del_rt(ifp->rt))
>>                       dst_free(&ifp->rt->u.dst);
>>               break;
>>       }
>
> Stephen,
>
> With these series of patches (1-4) applied I am no longer seeing the
> hangs and warnings associated with ipv6. I ran few rounds of
> tests with resetting the interface and loading/unloading modules.

Looks like these patches did not make it into net-2.6 and the issue can be seen
in the latest stable 2.6.34.

Any chance that the patches can be pushed to 2.6.34-stable?

Thanks,
Emil
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