The output of ps xHwl shows that the process seems to be ptraced.
0 1000 18727 1 20 0 252264 60284 futex_ Sl ? 0:23
/usr/lib/firefox-3.6.24/firefox-bin
1 1000 18727 1 20 0 252264 60284 futex_ Sl ? 0:00
/usr/lib/firefox-3.6.24/firefox-bin
1 1000 18727 1 20 0 252264 60284 futex_ Sl ? 0:00
/usr/lib/firefox-3.6.24/firefox-bin
1 1000 18727 1 20 0 252264 60284 wait Sl ? 0:00
/usr/lib/firefox-3.6.24/firefox-bin
1 1000 18727 1 20 0 252264 60284 poll_s Sl ? 0:00
/usr/lib/firefox-3.6.24/firefox-bin
0 1000 18768 18727 20 0 104156 18380 ptrace Tl ? 0:00
/usr/lib/firefox-3.6.24/plugin-container
/usr/lib/adobe-flashplugin/libflashplayer.so 18727 plugin true
1 1000 18768 18727 20 0 104156 18380 unix_s Sl ? 0:02
/usr/lib/firefox-3.6.24/plugin-container
/usr/lib/adobe-flashplugin/libflashplayer.so 18727 plugin true
This would explain, why strace could not connect. From the documentation
of the ptrace system call:
"EPERM
The specified process cannot be traced. This could be because the parent
has insufficient privileges (the required capability is CAP_SYS_PTRACE);
unprivileged processes cannot trace processes that they cannot send signals to
or those running set-user-ID/set-group-ID programs, for obvious reasons.
Alternatively, the process may already be being traced, or be init(8) (PID 1). "
Does firefox make use of the ptrace system call to control its
subprocess?
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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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