[Bug 1171582] Re: [highbank] hvc0 getty causes random hangs

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https://bugs.launchpad.net/bugs/1171582

Title:
  [highbank] hvc0 getty causes random hangs

Status in “finish-install” package in Ubuntu:
  Confirmed
Status in “linux” package in Ubuntu:
  In Progress
Status in “finish-install” source package in Raring:
  Confirmed
Status in “linux” source package in Raring:
  In Progress

Bug description:
  After doing a fresh install of raring, I've observed several issues
  across multiple systems, and they all seem to be correlated with the
  hvc0 upstart job (hvc0 getty) running.

  One symptom I've seen on both machines is that the network goes
  unresponsive for several seconds before recovering. If I run a ping, I
  see a pattern of 84-85s of responses, followed by about 41s of
  failures.

  The khvcd process consumes a lot of CPU - often 100% of a processor.

  Processes seem to randomly hang and are seemingly unrecoverable. I ran
  an apt-get install that never emitted any output, but remained hung
  until I rebooted the system.

  When I try to kill the hvc0 upstart job (sudo stop hvc0 - or a kill
  -9), the process does not die.

  One one of the two hosts, I observed the console getty (ttyAMA0)
  successfully starting, but never providing a login prompt to the
  console. Restarting this process didn't help solve the problem.

  Disabling the hvc0 upstart job and rebooting reliably makes these
  problems go away.

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