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[Sander <sander_ubuntu@xxxxxxxxxxxxxxx>]

Same issue here, Ubuntu 14.04 64 bits on a Toshiba Portege Z30-A 18J, custom kernel 3.18.11 64 bits though. I suspect it has something to do with certain processes running on the system, such as perhaps Nautilus, but no hard evidence. The problem only occurs after a long uptime duration.
Strace gives the same result as #5 mentioned.

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https://bugs.launchpad.net/bugs/1173915

Title:
  initctl continuously takes 100% of CPU

Status in upstart package in Ubuntu:
  Confirmed

Bug description:
  Many programs are fairly slow to start on my computer, despite it
  being relatively new (core i5). Suspecting a heavy CPU usage, I
  started gnome-system-monitor: all processes were displayed at 0% CPU,
  but the overall load was 1.33; 1.33; 1.34.

  Using the "top" command, however, revealed the real CPU use, with the
  "initctl" process taking 100%CPU, even 1 hour after startup.

  I upgraded to roaring ringtail before checking this but the symptoms
  were the same with quantal quetzal, so there is a fair chance the
  causes were identical.

  Regards

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: upstart 1.8-0ubuntu1
  ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
  Uname: Linux 3.8.0-19-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  CheckboxSubmission: 2deefc5fd2f1f0ae2fdd4bd781248a2a
  CheckboxSystem: daed2f3d6643b4a84b4520a2427f8c2b
  Date: Sun Apr 28 13:04:05 2013
  ExecutablePath: /sbin/initctl
  InstallationDate: Installed on 2012-12-15 (133 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MarkForUpload: True
  ProcEnviron:
   
  ProcKernelCmdline: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic root=UUID=fa624f8f-d9d0-4b09-af8b-88b106aaaf5b ro quiet splash vt.handoff=7
  SourcePackage: upstart
  UpgradeStatus: Upgraded to raring on 2013-04-28 (0 days ago)
  UpstartBugCategory: System

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