[Bug 1173915] Re: initctl continuously takes 100% of CPU

[Arul]

Any update on a fix to this problem?

My work around is to kill the initctl if/when I restart; I haven't
noticed any adverse effect on anything I do on a daily basis and it is
running more than 2+ weeks with no sign of initctl going crazy. Since I
very rarely reboot (only after any updates and such), it is not a big
deal for me now but would be nice to get a fix to this problem.

Not sure the following info helps but I am sure it will give some clue. I attached gdb and dumped the stack trace after a fresh reboot (i.e. when initctl is fine) as well as the same when it goes crazy to compare. Here are the two traces.
 
stack trace normal (siting in poll() normally)
==================
(gdb) where
#0  0x00007f00ff2ba0a0 in __poll_nocancel () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f00ff5ae78f in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#2  0x00007f00ff5ad3fe in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#3  0x00007f00ff596164 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#4  0x00007f00ff596c5c in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#5  0x0000559a959932c9 in ?? ()
#6  0x00007f00ff9e9ef0 in ?? () from /lib/x86_64-linux-gnu/libnih.so.1
#7  0x00007f00ff9ea513 in nih_command_parser () from /lib/x86_64-linux-gnu/libnih.so.1
#8  0x0000559a95990699 in ?? ()
#9  0x00007f00ff1de3f1 in __libc_start_main (main=0x559a95990620, argc=3, 
    argv=0x7fff0ace82d8, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fff0ace82c8) at ../csu/libc-start.c:291
#10 0x0000559a959906ea in ?? ()


stack trace w/ problem (appear to read something from FD 3 (a unix socket to upstart?)
======================
(gdb) where
#0  0x00007f7750af142d in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#1  0x00007f7750af5f41 in dbus_message_get_reply_serial () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#2  0x00007f7750aeb146 in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#3  0x00007f7750aebc5c in ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#4  0x0000557f7db2d2c9 in ?? ()
#5  0x00007f7750f3eef0 in ?? () from /lib/x86_64-linux-gnu/libnih.so.1
#6  0x00007f7750f3f513 in nih_command_parser () from /lib/x86_64-linux-gnu/libnih.so.1
#7  0x0000557f7db2a699 in ?? ()
#8  0x00007f77507333f1 in __libc_start_main (main=0x557f7db2a620, argc=3, argv=0x7fff51adf6d8, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fff51adf6c8) at ../csu/libc-start.c:291
#9  0x0000557f7db2a6ea in ?? ()

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

Title:
  initctl continuously takes 100% of CPU

Status in upstart :
  Confirmed
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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