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

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Date:	Wed, 16 Jun 2010 09:55:45 -0600
From:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
To:	Einar EL Lueck <ELELUECK@...ibm.com>
CC:	NetDev <netdev@...r.kernel.org>
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

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