Sep 26 04:18:27  kernel: [297662.057804] ------------[ cut here ]------------
Sep 26 04:18:27  kernel: [297662.057837] WARNING: CPU: 4 PID: 0 at 
/build/linux-R0TiM8/linux-4.4.0/net/sched/sch_generic.c:306 
dev_watchdog+0x237/0x240()
Sep 26 04:18:27  kernel: [297662.057842] NETDEV WATCHDOG: enp8s0f0 (igb): 
transmit queue 0 timed out
Sep 26 04:18:27  kernel: [297662.057846] Modules linked in: xt_tcpudp 
xt_physdev br_netfilter iptable_filter ip_tables x_tables xen_netback 
xen_blkback xen_gntdev xen_evtchn xenfs xen_privcmd 8021q garp mrp bridge stp 
llc gpio_ich intel_powerclamp coretemp input_leds i7core_edac ioatdma joydev 
serio_raw edac_core shpchp 8250_fintek lpc_ich mac_hid i5500_temp ib_iser 
rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp 
libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov 
async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid0 multipath 
linear raid1 hid_generic usbhid hid crct10dif_pclmul crc32_pclmul aesni_intel 
aes_x86_64 lrw ast gf128mul glue_helper ttm ablk_helper cryptd drm_kms_helper 
syscopyarea psmouse sysfillrect sysimgblt fb_sys_fops drm ahci libahci igb 
e1000e dca ptp pps_core i2c_algo_bit fjes
Sep 26 04:18:27  kernel: [297662.057928] CPU: 4 PID: 0 Comm: swapper/4 Not 
tainted 4.4.0-38-generic #57-Ubuntu
Sep 26 04:18:27  kernel: [297662.057931] Hardware name: Aquarius 
Aquarius/Z8NR-D12, BIOS 1101    04/14/2010
Sep 26 04:18:27  kernel: [297662.057933]  0000000000000200 e78f189e865bce1a 
ffff880c0ff03d98 ffffffff813f1b73
Sep 26 04:18:27  kernel: [297662.057937]  ffff880c0ff03de0 ffffffff81d675e0 
ffff880c0ff03dd0 ffffffff810811c2
Sep 26 04:18:27  kernel: [297662.057944]  0000000000000000 ffff880bfe2f8b00 
0000000000000004 ffff880005de8000
Sep 26 04:18:27  kernel: [297662.057948] Call Trace:
Sep 26 04:18:27  kernel: [297662.057950]  <IRQ>  [<ffffffff813f1b73>] 
dump_stack+0x63/0x90
Sep 26 04:18:27  kernel: [297662.057964]  [<ffffffff810811c2>] 
warn_slowpath_common+0x82/0xc0
Sep 26 04:18:27  kernel: [297662.057967]  [<ffffffff8108125c>] 
warn_slowpath_fmt+0x5c/0x80
Sep 26 04:18:27  kernel: [297662.057971]  [<ffffffff8174c037>] 
dev_watchdog+0x237/0x240
Sep 26 04:18:27  kernel: [297662.057974]  [<ffffffff8174be00>] ? 
qdisc_rcu_free+0x40/0x40
Sep 26 04:18:27  kernel: [297662.057980]  [<ffffffff810ec6f5>] 
call_timer_fn+0x35/0x120
Sep 26 04:18:27  kernel: [297662.057983]  [<ffffffff8174be00>] ? 
qdisc_rcu_free+0x40/0x40
Sep 26 04:18:27  kernel: [297662.057987]  [<ffffffff810ed0aa>] 
run_timer_softirq+0x23a/0x2f0
Sep 26 04:18:27  kernel: [297662.057991]  [<ffffffff81085c21>] 
__do_softirq+0x101/0x290
Sep 26 04:18:27  kernel: [297662.057994]  [<ffffffff81085f23>] 
irq_exit+0xa3/0xb0
Sep 26 04:18:27  kernel: [297662.058000]  [<ffffffff814d23a5>] 
xen_evtchn_do_upcall+0x35/0x40
Sep 26 04:18:27  kernel: [297662.058007]  [<ffffffff8183246e>] 
xen_do_hypervisor_callback+0x1e/0x40
Sep 26 04:18:27  kernel: [297662.058009]  <EOI>  [<ffffffff810013aa>] ? 
xen_hypercall_sched_op+0xa/0x20
Sep 26 04:18:27  kernel: [297662.058016]  [<ffffffff810013aa>] ? 
xen_hypercall_sched_op+0xa/0x20
Sep 26 04:18:27  kernel: [297662.058021]  [<ffffffff810233fc>] ? 
xen_safe_halt+0xc/0x20
Sep 26 04:18:27  kernel: [297662.058026]  [<ffffffff81038d7e>] ? 
default_idle+0x1e/0xe0
Sep 26 04:18:27  kernel: [297662.058029]  [<ffffffff8103958f>] ? 
arch_cpu_idle+0xf/0x20
Sep 26 04:18:27  kernel: [297662.058034]  [<ffffffff810c407a>] ? 
default_idle_call+0x2a/0x40
Sep 26 04:18:27  kernel: [297662.058040]  [<ffffffff810c43e1>] ? 
cpu_startup_entry+0x2f1/0x350
Sep 26 04:18:27  kernel: [297662.058044]  [<ffffffff8102b57a>] ? 
cpu_bringup_and_idle+0x2a/0x40
Sep 26 04:18:27  kernel: [297662.058049] ---[ end trace 0a05f6302e9c6bee ]---
Sep 26 04:18:27  kernel: [297662.058246] igb 0000:08:00.0 enp8s0f0: Reset 
adapter
Sep 26 04:18:27  kernel: [297662.060278] xenbr0: port 1(enp8s0f0) entered 
disabled state
Sep 26 04:18:27  kernel: [297662.082166] igb 0000:08:00.1 enp8s0f1: Reset 
adapter
Sep 26 04:18:27  kernel: [297662.086421] igb 0000:08:00.1 enp8s0f1: igb: 
enp8s0f1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
Sep 26 04:18:27  kernel: [297662.204470] igb 0000:08:00.1 enp8s0f1: igb: 
enp8s0f1 NIC Link is Down
Sep 26 04:18:28  kernel: [297663.057927] brvlan97: port 1(vlan97) entered 
disabled state
Sep 26 04:18:28  kernel: [297663.058060] brvlan99: port 1(vlan99) entered 
disabled state
Sep 26 04:18:28  kernel: [297663.058151] brvlan100: port 1(vlan100) entered 
disabled state
Sep 26 04:18:28  kernel: [297663.058270] brvlan220: port 1(vlan220) entered 
disabled state
Sep 26 04:18:29  kernel: [297664.094065] igb 0000:08:00.1 enp8s0f1: Reset 
adapter

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Title:
  NETDEV WATCHDOG: transmit queue 0 timed out

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