[Bug 922754] Re: booting without --no-log causes init and plymouth-upstart-bridge to spin at 100%

Steve Langasek steve.langasek at canonical.com
Mon Jan 30 05:13:11 UTC 2012


Hi James,

On Sat, Jan 28, 2012 at 10:34:25AM -0000, James Hunt wrote:
> @Stefan: I've updated the upstart-testing PPA with upstart -
> 1.4-0ubuntu5:

>     https://launchpad.net/~jamesodhunt/+archive/upstart-
> testing/+packages

> This backs out a late change which I suspect might be the cause of this
> problem. Please could you try this version once it has built.

I've been able to reproduce the problem when booting -0ubuntu4 here with
--log, and I'm afraid the problem is also still reproducible with the
-0ubuntu5 package from your ppa.  Will try to find a minimal reproducer for
this issue.

-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org

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https://bugs.launchpad.net/bugs/922754

Title:
  booting without --no-log causes init and plymouth-upstart-bridge to
  spin at 100%

Status in “upstart” package in Ubuntu:
  Incomplete

Bug description:
  Release: Precise
  Architecture: amd64

  Likely broken since upstart_1.4-0ubuntu3

  When booting after recent updates I see init and plymouth-upstart-
  bridge spinning at 100% CPU time, defunct processes do not get reaped
  and a console on ttyS1 which is supposed to start, does not come up.

  Looking at strace of plymouth-upstart-bridge it seems to run a tight loop of 
  epoll_wait(3, {}, 64, 0)                = 0 (/proc/1383/fd/3 -> anon_inode:[eventpoll])

  and init does another tight loop of
  read(24, 0x7ffdc2d1caa0, 8192)          = -1 EAGAIN (Resource temporarily unavailable)
    (/proc/1/fd/24 -> /dev/ptmx)

  Booting with --no-log on the grub commandline brings the system up
  without showing any problems.

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