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[Ming Lei <1425576@xxxxxxxxxxxxxxxxxx>]

And the patches in below links can fix the above crashs(#14, #15)

http://kernel.ubuntu.com/git/ming/ubuntu-trusty.git/commit/?h=apm-enet-
fix&id=a19b2c0bdd12e59a482717664312b18407284ee5

http://kernel.ubuntu.com/git/ming/ubuntu-utopic.git/commit/?h=arm64-net-
backport&id=d46456e3ed9153e743f2add6e01d06c56eb2ceb7

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https://bugs.launchpad.net/bugs/1425576

Title:
  Occasional crash in APM xgene enet driver on kernels prior to v3.19

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Utopic:
  In Progress

Bug description:
  [Impact]
  System panics every few hours under constant network load

  [Test Case]
  On the X-Gene system, start an iperf server:
    $ iperf -s
  Connect to it from another system (1Gbps is sufficient)
    $ iperf -t 100000 -c <xgene host>

  On failure, you'll get a panic within several hours.

  [Regression Risk]
  The proposed patch only touches the impacted driver. It is adding a memory barrier - albeit a lightweight one - so there is the risk of a performance degradation. Indeed, when measured using a 60s iperf run, I do see a performance drop, but by < 0.5%.

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