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[Bug 1198180] Re: possible leak in upstart 1.5

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: James Hunt <1198180@xxxxxxxxxxxxxxxxxx>
Date: Tue, 30 Sep 2014 16:49:04 -0000
Reply-to: Bug 1198180 <1198180@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

This almost sounds like bug 1235649, but unlikely given that the
upstart-udev-bridge uses the correct NIH D-Bus calls.

I suspect the reason for the memory growth is that the events that are
being created cannot be destroyed until some other job has finished with
them. Once that happens, memory will be reclaimed automatically by
Upstart.

Please could those affected attach the output of 'initctl list'
(compressed if necessary).

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https://bugs.launchpad.net/bugs/1198180

Title:
  possible leak in upstart 1.5

Status in “upstart” package in Ubuntu:
  Confirmed

Bug description:
  Description:    Ubuntu 12.04.2 LTS
  Release:        12.04
  Package:    1.5-0ubuntu7.2
  Kernel:      Linux XXX 3.8.0-23-generic #34~precise1-Ubuntu SMP Wed May 29 21:12:31 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

  We're starting lxc containers on demand, so there's lots and lots of
  network interfaces going up and down. Udev emits signal, that goes to
  upstart-udev-bridge, and next to the upstart itself. After about 40K
  containers created/destroyed, upstart takes about 250MB or RAM, and it
  grows with every event received/send. Not only RAM is beeing used, but
  also init spends more time for every new event on the socket.

  What happens:
  init uses more RAM and more CPU during lifetime, when lots of network interfaces are beeing created/destroyed

  What is expected:
  init work should not change depending on number of events served

  technical detail:
  # pmap -x 1
  00007f446f865000       0  237036  237036 rw---    [ anon ]
  00007fffc694d000       0      24      24 rw---    [ stack ]
  00007fffc69fe000       0       4       0 r-x--    [ anon ]
  ffffffffff600000       0       0       0 r-x--    [ anon ]

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