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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I performed some testing and can confirm reverting commit 5981b69 in
vivid master-next does not bring back the original bug it was meant to
fix, bug 1540731 .  For confirmation, I also built a test kernel with
commit 5981b69 AND commit 0c0b98c6 reverted and the original bug did in
fact return.  I would say commit 0c0b98c6 is indeed the real fix for bug
1540731 .

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https://bugs.launchpad.net/bugs/1558447

Title:
  vivid/linux: total ADT test failures

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Vivid:
  New

Bug description:
  vivid/linux is hanging ADT test en-toto.  We seem to lose sshd, the
  console log ends thus:

  Ubuntu 15.04 adt ttyS0

  adt login: [  240.080182] INFO: task sshd:693 blocked for more than 120 seconds.
  [  240.081937]       Not tainted 3.19.0-57-generic #63-Ubuntu
  [  240.083413] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  240.085791] INFO: task sshd:760 blocked for more than 120 seconds.
  [  240.087441]       Not tainted 3.19.0-57-generic #63-Ubuntu
  [  240.088939] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  240.091099] INFO: task sshd:763 blocked for more than 120 seconds.
  [  240.092776]       Not tainted 3.19.0-57-generic #63-Ubuntu
  [  240.094232] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [  240.096431] INFO: task sshd:765 blocked for more than 120 seconds.
  [  240.098060]       Not tainted 3.19.0-57-generic #63-Ubuntu
  [  240.099514] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

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