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[Michael Mess <764621@xxxxxxxxxxxxxxxxxx>]

I am suffering from the same problem.

Today again, when I logged out from the computer, it told me about the
hanging firefox-bin process, but I just logged out anyway.

This left two processes bumming around.

18727 ?        Sl     0:25 /usr/lib/firefox-3.6.24/firefox-bin
18768 ?        Tl     0:04 /usr/lib/firefox-3.6.24/plugin-container /usr/lib/adobe-flashplugin/libflashplayer.so 18727 plugin true

I have tried to strace -p 18768, but with no success, even as root:

root@quad:~# strace -p 18768
attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted

I also tried to send SIGCONT ( kill -18 ) to 18768, but with no success.

It seems that the firefox-bin process is waiting for the plugin-
container, which is a stopped process, thus waiting forever.

michael@quad:~$ strace -p 18727
Process 18727 attached - interrupt to quit
futex(0xa2cffbd8, FUTEX_WAIT, 18767, NULL

When exiting firefox there should be a timeout waiting for plugins and
if the plugin-container or any other spawned process is detected in a
stopped state, it should be just killed with SIGKILL.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
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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