netdev - Re: Kernel panic eth2 mirred redirect to ifb0

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Date:	Sun, 19 Dec 2010 16:43:53 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Paweł Staszewski <pstaszewski@...are.pl>
Cc:	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: Kernel panic eth2 mirred redirect to ifb0

Le dimanche 19 décembre 2010 à 12:35 +0100, Paweł Staszewski a écrit :
> Hi all
> 
> I have panic with kernel 2.6.37-rc6-git2 when use iproute2 
> mirred/redirect action
> 
> 
> host1 (kernel 2.6.36.2)
> netperf client -> eth3 (82598EB 10-Gigabit AT CX4) - directly connected 
> to eth2 of host2
> ethtool -k eth3
> Offload parameters for eth3:
> rx-checksumming: on
> tx-checksumming: on
> scatter-gather: on
> tcp-segmentation-offload: on
> udp-fragmentation-offload: off
> generic-segmentation-offload: on
> generic-receive-offload: on
> large-receive-offload: off
> rx-vlan-offload: off
> tx-vlan-offload: off
> ntuple-filters: off
> receive-hashing: off
> 
> ethtool -i eth3
> driver: ixgbe
> version: 2.0.84-k2
> firmware-version: 1.12-2
> bus-info: 0000:03:00.1
> 
> 
> host2 (kernel-2.6.37-rc6-git2)
> netserver -> eth2 (82598EB 10-Gigabit AT CX4) - directly connected to 
> eth3 of host1
> 
> ethtool -k eth2
> Offload parameters for eth2:
> rx-checksumming: on
> tx-checksumming: on
> scatter-gather: on
> tcp-segmentation-offload: on
> udp-fragmentation-offload: off
> generic-segmentation-offload: on
> generic-receive-offload: on
> large-receive-offload: off
> rx-vlan-offload: on
> tx-vlan-offload: on
> ntuple-filters: off
> receive-hashing: off
> 
> ethtool -i eth2
> driver: ixgbe
> version: 2.0.84-k2
> firmware-version: 1.12-2
> bus-info: 0000:03:00.0
> 
> 
> 
> Normally without ifb and redirect netperf show:
> TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.2 
> (192.168.0.2) port 0 AF_INET
> Recv   Send    Send
> Socket Socket  Message  Elapsed
> Size   Size    Size     Time     Throughput
> bytes  bytes   bytes    secs.    10^6bits/sec
> 
>   87380  16384  16384    10.00    9042.14
> 
> 
> Steps to reproduce panic:
> ip link set dev ifb0 up
> 
> tc qdisc add dev eth2 ingress
> 
> tc filter add dev eth2 parent ffff: protocol ip prio 10 u32 \
> match ip src 0.0.0.0/0 flowid 1:1 \
> action mirred egress redirect dev ifb0
> 
> 
> After this when i start netperf on host1 I have panic (screenshot in 
> attached image).

Unfortunately, we miss the start of panic messages. Could you try to get
them ?



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