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[Vagrant Cascadian <1330671@xxxxxxxxxxxxxxxxxx>]

correction, i had a misconfiguration in my nbd-server that merely had
similar symptoms... 3.13.0-3257 works fine.

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https://bugs.launchpad.net/bugs/1330671

Title:
  LTSP boot fails, missing -stable patch "net: avoid dependency of
  net_get_random_once on nop patching"

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Released
Status in “linux” source package in Utopic:
  Fix Released

Bug description:
  The patch

      net: switch net_secret key generation to net_get_random_once
      https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e34c9a69970d8664a36b46e6445a7cc879111cfd

  introduced a regression into kernel 3.13 that makes the kernel's nbd
  client always use the same source port number (on some hardware). This
  means that the second and subsequent boots for an LTSP client fail
  because the sourceip / sourceport pair on the nbd server is still
  occupied by the old nbd connection.

  The patch

      net: avoid dependency of net_get_random_once on nop patching
      https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3d4405226d27b3a215e4d03cfa51f536244e5de7

  should fix the issue and also went into -stable:

  http://www.spinics.net/lists/netdev/msg282397.html
  https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=adeb3fe4ef6621793d7f1d6f0b9c9cc88827c5b7 )

  There are three independent reports on ltsp-discuss for this issue and the original analysis was posted here: https://www.mail-archive.com/ltsp-discuss@xxxxxxxxxxxxxxxxxxxxx/msg41764.html
  The issue can NOT be reproduced in VirtualBox and may be limited to certain hardware - other users report they see no problems with 3.13. However, as this is a -stable patch it should be applied anyway.

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