netdev - RE: ipv6: netif_carrier_(on|off) with traces afterwards

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Message-ID: <OFD4E8B395.2268B8B1-ONC1257745.00516577-C1257745.00517D27@de.ibm.com>
Date:	Thu, 17 Jun 2010 16:50:05 +0200
From:	Einar EL Lueck <ELELUECK@...ibm.com>
To:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
Cc:	NetDev <netdev@...r.kernel.org>
Subject: RE: ipv6: netif_carrier_(on|off) with traces afterwards

"Tantilov, Emil S" <emil.s.tantilov@...el.com> wrote on 06/16/2010 05:55:45
PM:

> From:
>
> "Tantilov, Emil S" <emil.s.tantilov@...el.com>
>
> To:
>
> Einar EL Lueck/Germany/IBM@...DE
>
> Cc:
>
> NetDev <netdev@...r.kernel.org>
>
> Date:
>
> 06/16/2010 05:55 PM
>
> Subject:
>
> RE: ipv6: netif_carrier_(on|off) with traces afterwards
>
> >-----Original Message-----
> >From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
On
> >Behalf Of Einar EL Lueck
> >Sent: Wednesday, June 16, 2010 6:30 AM
> >To: netdev@...r.kernel.org
> >Subject: ipv6: netif_carrier_(on|off) with traces afterwards
> >
> >
> >Hi,
> >With IPv6 addresses configured and and a network card doing
> >netif_carrier_off|on we see afterwards in 2.6.34 on S/390 some traces in
> >fib.
> >
> >Example sequence of operations:
> >ip -6 addr add fd00:10:30:49:4008:ffff:35:2/80 dev eth1
> >ip link set eth1 up
> >ip link set eth1 down
> ># the following lines have as effect netif_carrier_off and then on
(among
> >other stuff)
> >echo 0 > /sys/bus/ccwgroup/drivers/qeth/devices/0.0.e300/online
> >echo 1 > /sys/bus/ccwgroup/drivers/qeth/devices/0.0.e300/online
> ># end of plugging
> >ip link set eth1  up
> >ip link set eth1 down
> >=> at this point we get the following trace:
> >
> >Badness
> >at /home/autobuild/BUILD/linux-2.6.34-20100531/net/ipv6/ip6_fib.c:1160
>
> <snip>
>
> >
> >Has anybody seen effects like this before on other platforms, or has
> >anybody suggestions for the root cause?
>
> I had similar issues. The following patches fixed it for me:
>
> http://marc.info/?l=linux-netdev&m=127472600330413
>
> http://marc.info/?l=linux-netdev&m=127472599530407
>
> Thanks,
> Emil
>

Fixed it for me, too.
Thanks,
Einar.

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