[   29.073777] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:306 dev_watchdog+0x1dc/0x260()
[   29.082293] NETDEV WATCHDOG: eth0 (ag71xx): transmit queue 0 timed out
[   29.088839] Modules linked in: ath9k ath9k_common mac80211 ath9k_hw ath batman_adv libcrc32c cfg80211 compat ohci_platform ohci_hcd ehci_platform ehci_hcd gpio_button_hotplug usbcore nls_base usb_common crc16
 cryptomgr aead crypto_null crc32c_generic crypto_hash
[   29.112352] CPU: 0 PID: 0 Comm: swapper Not tainted 4.4.19 #0
[   29.118115] Stack : 803bae04 00000000 00000001 80410000 80403038 80402cc3 8039c4b8 00000000
[   29.118115] 	  80473798 8040135c 00000200 00100000 0000000a 800a6e84 803a1b24 80400000
[   29.118115] 	  00000003 8040135c 8039ff30 803fdc2c 0000000a 800a4e00 00000006 00000000
[   29.118115] 	  00000000 801f2200 00000000 00000000 00000000 00000000 00000000 00000000
[   29.118115] 	  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   29.118115] 	  ...
[   29.154070] Call Trace:
[   29.156539] [<80071a10>] show_stack+0x50/0x84
[   29.160936] [<8008174c>] warn_slowpath_common+0xa0/0xd0
[   29.166189] [<800817a8>] warn_slowpath_fmt+0x2c/0x38
[   29.171194] [<8028478c>] dev_watchdog+0x1dc/0x260
[   29.175936] [<800b0070>] call_timer_fn.isra.5+0x24/0x80
[   29.181196] [<800b02f4>] run_timer_softirq+0x1b4/0x1fc
[   29.186362] [<80083cc8>] __do_softirq+0x250/0x298
[   29.191120] [<8006a5b8>] plat_irq_dispatch+0xd4/0x10c
[   29.196193] [<80060830>] ret_from_irq+0x0/0x4
[   29.200580] [<80060a80>] __r4k_wait+0x20/0x40
[   29.204962] [<800a1fe0>] cpu_startup_entry+0x9c/0xe8
[   29.209997] [<80421bd4>] start_kernel+0x470/0x490
[   29.214717]
[   29.216217] ---[ end trace 31ef4dab9c7fda9c ]---
[   29.220864] eth0: tx timeout
followed by a bunch of eth0: tx timeout's