> -----Original Message-----
> From: Lorenz Brun <[email protected]>
> Sent: Saturday, September 26, 2026 12:27 AM
> To: Nguyen, Anthony L <[email protected]>; Kitszel,
> Przemyslaw <[email protected]>; Andrew Lunn
> <[email protected]>; David S. Miller <[email protected]>; Eric
> Dumazet <[email protected]>; Jakub Kicinski <[email protected]>; Paolo
> Abeni <[email protected]>
> Cc: [email protected]; [email protected]; linux-
> [email protected]
> Subject: [PATCH] ice: fix pktgen crash in eswitch mode
>
> When pktgen reuses an skb on an ICE port representor, the representor
> forwards it to the uplink through dev_queue_xmit(). If the lower qdisc
> retains the skb, a subsequent transmission of the same skb overwrites
> its list pointers. Dequeuing it from qdisc->gso_skb then dereferences
> a NULL skb->next in __skb_unlink().
>
> Disable SKB reuse for this ice path to prevent this.
>
> Crash signature:
> __dev_queue_xmit+0x5c9/0xf20
> ice_eswitch_port_start_xmit+0x83/0xd0 [ice]
> pktgen_thread_worker+0x82f/0x1c10 [pktgen]
>
I think this patch required fixes tag.
And if it's serios bugfix it needs to go [PATCH net]
Reviewed-by: Aleksandr Loktionov <[email protected]>
> Signed-off-by: Lorenz Brun <[email protected]>
> ---
> drivers/net/ethernet/intel/ice/ice_repr.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/net/ethernet/intel/ice/ice_repr.c
> b/drivers/net/ethernet/intel/ice/ice_repr.c
> index 096566c697f4..2603cb0f6a54 100644
> --- a/drivers/net/ethernet/intel/ice/ice_repr.c
> +++ b/drivers/net/ethernet/intel/ice/ice_repr.c
> @@ -305,6 +305,7 @@ ice_repr_reg_netdev(struct net_device *netdev,
> const struct net_device_ops *ops)
> eth_hw_addr_random(netdev);
> netdev->netdev_ops = ops;
> ice_set_ethtool_repr_ops(netdev);
> + netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
>
> netdev->hw_features |= NETIF_F_HW_TC;
>
> --
> 2.54.0
