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[Michael Mess <764621@xxxxxxxxxxxxxxxxxx>]

I just straced the firefox-bin process:

michael@quad:~$ strace -p 18727
Process 18727 attached - interrupt to quit
futex(0xa2cffbd8, FUTEX_WAIT, 18767, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
futex(0xa2cffbd8, FUTEX_WAIT, 18767, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
futex(0xa2cffbd8, FUTEX_WAIT, 18767, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
futex(0xa2cffbd8, FUTEX_WAIT, 18767, NULL) = 0
munmap(0xb62fe000, 8392704)             = 0
writev(14, [{"GIOP\1\2\1\5\0\0\0\0", 12}], 1) = -1 EPIPE (Broken pipe)
--- SIGPIPE (Broken pipe) @ 0 (0) ---
close(14)                               = 0
writev(12, [{"GIOP\1\2\1\5\0\0\0\0", 12}], 1) = -1 EPIPE (Broken pipe)
--- SIGPIPE (Broken pipe) @ 0 (0) ---
close(12)                               = 0
close(9)                                = 0
close(8)                                = 0
unlink("/tmp/orbit-michael/linc-4927-0-3d737aaabe747") = 0
close(13)                               = 0
close(86)                               = 0
exit_group(0)                           = ?
Process 18727 detached

Then I sent SIGCHILD to it some times with no success, because I remembered that SIGCHILD was sometimes useful to reanimate a hanging Netscape process in the past.
When I killed the plugin-container subprocess (kill -9 18768), the firefox-bin process continued and terminated normally.

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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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