Comment 93 for bug 1104435

I don't know if it is related but I also noticed this warning:

(xfce4-session.dbg:16977): GLib-WARNING **: GChildWatchSource: Exit status of a child process was requested but ECHILD was received by waitpid(). Most likely the process is ignoring SIGCHLD, or some other thread is invoking waitpid() with a nonpositive first argument; either behavior can break applications that use g_child_watch_add()/g_spawn_sync() either directly or indirectly.

It puzzles me because I have verified that SIGCHLD is not ignored and I patched out the waitpid() in the kde compat. I also grepped the libs that they don't do any waitpid().