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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
utopic' to 'verification-done-utopic'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!

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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:
  Fix Committed
Status in linux source package in Utopic:
  Fix Committed

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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