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Turned on debugging using "ethtool -s eth0 msglvl $((0x7fff))" and saw
the following messages when it hung:


[3408740.816032] niu: niu_interrupt() ldg[ffff8807141d16d0](18)
v0[8000000000] v1[0] v2[0]
[3408740.816036] niu 0000:09:00.0: eth2: niu_txchan_intr() cs[b860b860000c000]
[3408740.816038] niu 0000:09:00.0: eth2: niu_poll_core() v0[0000008000000000]
[3408740.816040] niu 0000:09:00.0: eth2: niu_tx_work() pkt_cnt[0] cons[119]
[3408740.816042] niu: niu_interrupt() ldg[ffff8807141d16d0](18)
v0[8000000000] v1[0] v2[0]
[3408740.820004] [sched_delayed] sched: RT throttling activated
[3408740.824021] niu 0000:09:00.0: eth2: Disable interrupts
[3408740.824044] niu 0000:09:00.0: eth2: Disable RX MAC
[3408740.824048] niu 0000:09:00.0: eth2: Disable IPP
[3408740.824054] niu 0000:09:00.0: eth2: Stop TX channels
[3408740.824641] niu 0000:09:00.0: eth2: Stop RX channels
[3408740.824652] niu 0000:09:00.0: eth2: Reset TX channels
[3408740.825212] niu 0000:09:00.0: eth2: Reset RX channels
[3408740.825999] niu 0000:09:00.0: eth2: Initialize TXC
[3408740.826002] niu 0000:09:00.0: eth2: Initialize TX channels

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https://bugs.launchpad.net/bugs/1164497

Title:
  108e:abcd niu 10g ethernet driver lock-up (Transmit timed out,
  resetting) and NETDEV WATCHDOG

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Using niu driver for this card:
  "Oracle/SUN Multithreaded 10-Gigabit Ethernet Network Controller" (PCI id = 108e:abcd)
  after a period (often less than 24 hours) the interface will hang, with errors every 5 seconds
  "niu: xxx: eth2: Transmit timed out, resetting"

  Sometimes also in syslog are messages
  WARNING: at sch_generic:255 dev_watchdog
  NETDEV WATCHDOG: eth2 (niu): transmit queue 10 timed out

  I've seen this in kernel 3.5.0-26-generic #42~precise1-Ubuntu SMP installed from 12.04 server.
  I've also seen it in kernel 3.2.0-39-generic #62-Ubuntu SMP after I installed this older version as a test.
  (I've not *yet* seen it in kernel 3.2.0-38-generic #61-Ubuntu SMP which is running on a different computer, same hardware but installed from 12.04 then upgraded rather than being installed from 12.04.2 directly. The problem computer is also less heavily loaded in general than the one which has worked fine so far.)

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