Comment 7 for bug 889527

I am experiencing this issue and can trigger it by downloading via bittorrent. if i limit the number of connections it seems to take longer to occur. I am running Ubuntu 11.10.

eth:
04:00.0 Ethernet controller: Atheros Communications AR8151 v2.0 Gigabit Ethernet (rev c0)

system:
Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz
ASRock H61M-U3S3
2 x 2GB DDR3-1333

syslog:
Dec 9 21:58:59 bruno-desktop NetworkManager[861]: <info> (eth0): carrier now OFF (device state 100, deferring action for 4 seconds)
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404559] ------------[ cut here ]------------
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404581] WARNING: at /build/buildd/linux-3.0.0/net/sched/sch_generic.c:255 dev_watchdog+0x1e6/0x1f0()
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404585] Hardware name: To Be Filled By O.E.M.
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404587] NETDEV WATCHDOG: eth0 (atl1c): transmit queue 0 timed out
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404590] Modules linked in: snd_hrtimer rfcomm bnep bluetooth binfmt_misc snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel ppdev snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi i915 snd_seq_midi_event snd_seq drm_kms_helper drm i2c_algo_bit video snd_timer snd_seq_device mei(C) snd parport_pc soundcore snd_page_alloc lp parport usbhid hid usb_storage uas atl1c xhci_hcd
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404642] Pid: 0, comm: kworker/0:0 Tainted: G C 3.0.0-13-generic-pae #22-Ubuntu
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404646] Call Trace:
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404660] [<c10503c2>] warn_slowpath_common+0x72/0xa0
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404665] [<c1478fa6>] ? dev_watchdog+0x1e6/0x1f0
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404668] [<c1478fa6>] ? dev_watchdog+0x1e6/0x1f0
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404673] [<c1050493>] warn_slowpath_fmt+0x33/0x40
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404677] [<c1478fa6>] dev_watchdog+0x1e6/0x1f0
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404686] [<c105d80f>] call_timer_fn+0x2f/0x110
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404691] [<c1478dc0>] ? qdisc_reset+0x40/0x40
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404696] [<c105ef0b>] run_timer_softirq+0xeb/0x210
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404699] [<c1478dc0>] ? qdisc_reset+0x40/0x40
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404705] [<c1056f10>] ? local_bh_enable_ip+0x90/0x90
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404709] [<c1056f91>] __do_softirq+0x81/0x1a0
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404713] [<c1056f10>] ? local_bh_enable_ip+0x90/0x90
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404717] <IRQ> [<c10572d6>] ? irq_exit+0x76/0xa0
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404727] [<c155d169>] ? smp_apic_timer_interrupt+0x59/0x88
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404734] [<c1555fb9>] ? apic_timer_interrupt+0x31/0x38
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404739] [<c105007b>] ? __stack_chk_fail+0x1b/0x20
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404747] [<c12e1827>] ? intel_idle+0xb7/0x110
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404758] [<c1438638>] ? cpuidle_idle_call+0x78/0x190
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404763] [<c1008c7a>] ? cpu_idle+0x8a/0xc0
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404771] [<c153ad3b>] ? start_secondary+0xe8/0xed
Dec 9 21:58:59 bruno-desktop kernel: [ 1057.404774] ---[ end trace 5076354959ead75d ]---
Dec 9 21:59:00 bruno-desktop NetworkManager[861]: <info> (eth0): carrier now ON (device state 100)
Dec 9 21:59:00 bruno-desktop kernel: [ 1057.429213] atl1c 0000:04:00.0: irq 51 for MSI/MSI-X
Dec 9 21:59:00 bruno-desktop kernel: [ 1057.429293] atl1c 0000:04:00.0: atl1c: eth0 NIC Link is Up<100 Mbps Full Duplex>

if i re-trigger after networking restart syslog contains:

Dec 9 22:23:46 bruno-desktop NetworkManager[861]: <info> (eth0): carrier now OFF (device state 100, deferring action for 4 seconds)
Dec 9 22:23:47 bruno-desktop NetworkManager[861]: <info> (eth0): carrier now ON (device state 100)
Dec 9 22:23:47 bruno-desktop kernel: [ 2544.341403] atl1c 0000:04:00.0: irq 51 for MSI/MSI-X
Dec 9 22:23:47 bruno-desktop kernel: [ 2544.341484] atl1c 0000:04:00.0: atl1c: eth0 NIC Link is Up<100 Mbps Full Duplex>