[Bug 764621] Re: /usr/lib/firefox-4.0/plugin-container hangs upon Firefox exit, which prevents computer shutdown from GNOME

[Michael Mess]

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 at 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 at 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.

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

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