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@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@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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https://bugs.launchpad.net/bugs/764621
Title:
/usr/lib/firefox-4.0/plugin-container hangs upon Firefox exit, which
prevents computer shutdown from GNOME
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