Firefox is waiting on futex if this helps.
lukasz@eleonore:~$ ps ax | grep fire 7541 ? S 1:01 /usr/lib/firefox-3.0.7/firefox 7943 pts/1 S+ 0:00 grep fire lukasz@eleonore:~$ strace -p 7541 Process 7541 attached - interrupt to quit futex(0xd99138, FUTEX_WAIT_PRIVATE, 2, NULL ^C <unfinished ...> Process 7541 detached lukasz@eleonore:~$ killall firefox
Firefox is waiting on futex if this helps.
lukasz@eleonore:~$ ps ax | grep fire firefox- 3.0.7/firefox
7541 ? S 1:01 /usr/lib/
7943 pts/1 S+ 0:00 grep fire
lukasz@eleonore:~$ strace -p 7541
Process 7541 attached - interrupt to quit
futex(0xd99138, FUTEX_WAIT_PRIVATE, 2, NULL
^C <unfinished ...>
Process 7541 detached
lukasz@eleonore:~$ killall firefox