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[Michael Mess <764621@xxxxxxxxxxxxxxxxxx>]

Further analysis:

michael@quad:~$ pstree -p 18727
firefox-bin(18727)─┬─plugin-containe(18768)───{plugin-contain}(18769)
                   ├─{firefox-bin}(18742)
                   ├─{firefox-bin}(18743)
                   ├─{firefox-bin}(18767)
                   └─{firefox-bin}(18782)


ps -xms shows these infos:

 1000 18727 0000000000000000                -                -                - -    ?          0:25 /usr/lib/firefox-3.6.24/firefox-bin
 1000     - 0000000000000000 0000000000000000 0000000000001000 0000000180004087 Sl   -          0:23 -
 1000     - 0000000000000000 0000000000000000 0000000000001000 0000000180004087 Sl   -          0:00 -
 1000     - 0000000000000000 0000000000000000 0000000000001000 0000000180004087 Sl   -          0:00 -
 1000     - 0000000000000000 0000000000000000 0000000000001000 0000000180004087 Sl   -          0:00 -
 1000     - 0000000000000000 fffffffe7ffbfeff 0000000000001000 0000000180004087 Sl   -          0:00 -
 1000 18768 0000000000000000                -                -                - -    ?          0:04 /usr/lib/firefox-3.6.24/plugin-container /usr/lib/adobe-flashplugin/libflashplayer.so 18727 plugin true
 1000     - 0000000000000000 0000000000000000 0000000000001000 00000001800a04e8 Tl   -          0:00 -
 1000     - 0000000000000000 00000000000004e8 0000000000001000 00000001800a04e8 Sl   -          0:02 -

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https://bugs.launchpad.net/bugs/764621

Title:
  /usr/lib/firefox-4.0/plugin-container hangs upon Firefox exit, which
  prevents computer shutdown from GNOME

Status in “firefox” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: firefox

  Every time I exit Firefox before rebooting this host running a classic
  GNOME session, it hangs there, effectivel preventing the reboot from
  taking place unless Firefox is first force-killed. The cause seems to
  be that Firefox's plugin container has a dozen of Gnash sub-processes
  that won't terminate.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: firefox 4.0+nobinonly-0ubuntu2
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  Architecture: i386
  Date: Mon Apr 18 16:21:00 2011
  FirefoxPackages:
   firefox 4.0+nobinonly-0ubuntu2
   flashplugin-installer N/A
   adobe-flashplugin N/A
   icedtea-plugin N/A
  ProcEnviron:
   LANGUAGE=fi_FI:fi_FI.UTF-8:fi
   PATH=(custom, user)
   LANG=fi_FI.UTF-8
   SHELL=/bin/bash
  SourcePackage: firefox
  UpgradeStatus: Upgraded to natty on 2009-09-14 (581 days ago)

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