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

[Michael Mess]

Today I got the issue at work, but a little bit different:

This time the plugin container was a Zombie process, that means the plugin container process has already exited, but its parent process didn't care about it yet.
Thus this time killing the plugin-container process didn't help, because it was already dead.
Sending SIGCHLD to the parent process also didn't help.
Sending SIGTERM to the parent process removed the processes.

It seems that there are two different bugs, resulting in firefox-bin to hang:
 - One bug that freezes the plugin-container
 - One bug that lets firefox-bin hang, even after the plugin-container process has exited.


13865 ?        Sl     3:58 /usr/lib/firefox-3.6.24/firefox-bin
13901 ?        Zl     0:25  \_ [plugin-containe] <defunct>

michael at musca:~ $ pstree -p 13865
firefox-bin(13865)─┬─plugin-containe(13901)───{plugin-contain}(13902)
                   ├─{firefox-bin}(13874)
                   ├─{firefox-bin}(13876)
                   ├─{firefox-bin}(13877)
                   ├─{firefox-bin}(13900)
                   └─{firefox-bin}(14545)

michael at musca:/proc/13865 $ cat stack 
[<c0178fa5>] futex_wait_queue_me+0xa5/0xd0
[<c017a278>] futex_wait+0x1a8/0x2c0
[<c017bab6>] do_futex+0xe6/0x1f0
[<c017bc32>] sys_futex+0x72/0x120
[<c01033ec>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff


futex(0xb74a2bd8, FUTEX_WAIT, 13874, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
send(17, "a", 1, 0)                     = -1 EAGAIN (Resource temporarily unavailable)
sigreturn()                             = ? (mask now [])
futex(0xb74a2bd8, FUTEX_WAIT, 13874, NULL <unfinished ...>
+++ killed by SIGTERM +++

At home and at work I have Firefox 3.6.24:

Package: firefox
Version: 3.6.24+build2+nobinonly-0ubuntu0.10.04.1

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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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