Replace `dev_kfree_skb()` with `dev_kfree_skb_any()` in `start_xmit()` which can be called from netpoll (hard IRQ) and from other contexts. Also, `np->link_status` can be changed at any time by interrupt handler. -0 [011] dNh4. 4541.754603: start_xmit <-netpoll_start_xmit -0 [011] dNh4. 4541.754622: => [FTRACE TRAMPOLINE] => start_xmit => netpoll_start_xmit => netpoll_send_skb => write_msg => console_flush_all => console_unlock => vprintk_emit => _printk => rio_interrupt => __handle_irq_event_percpu => handle_irq_event => handle_fasteoi_irq => __common_interrupt => common_interrupt => asm_common_interrupt => mwait_idle => default_idle_call => do_idle => cpu_startup_entry => start_secondary => common_startup_64 This issue can occur when the link state changes from off to on (e.g., plugging or unplugging the LAN cable) while transmitting a packet. If the skb has a destructor, a warning message may be printed in this situation. -> consume_skb (dev_kfree_skb()) -> __kfree_skb() -> skb_release_all() -> skb_release_head_state(skb) if (skb->destructor) { DEBUG_NET_WARN_ON_ONCE(in_hardirq()); skb->destructor(skb); } Found by inspection. Signed-off-by: Yeounsu Moon Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Tested-on: D-Link DGE-550T Rev-A3 Reviewed-by: Simon Horman --- drivers/net/ethernet/dlink/dl2k.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/dlink/dl2k.c b/drivers/net/ethernet/dlink/dl2k.c index 7077d705e471..6e4f17142519 100644 --- a/drivers/net/ethernet/dlink/dl2k.c +++ b/drivers/net/ethernet/dlink/dl2k.c @@ -733,7 +733,7 @@ start_xmit (struct sk_buff *skb, struct net_device *dev) u64 tfc_vlan_tag = 0; if (np->link_status == 0) { /* Link Down */ - dev_kfree_skb(skb); + dev_kfree_skb_any(skb); return NETDEV_TX_OK; } entry = np->cur_tx % TX_RING_SIZE; -- 2.51.0