Ignoring SIGCHLD causes a race leading to the occasional hang of init

when init will wait() on itself in waitfor() when the child exits before
init is scheduled to run.  Letting init hang is very seriously bad.
 -Erik

diff --git a/init/init.c b/init/init.c
index ab2d0ea91efb79ad0e4377f4af8a34c1e3414a99..989babff7f0d69766040670cdadda8dc3f616eac 100644 (file)
--- a/init/init.c
+++ b/init/init.c
@@ -1063,7 +1063,6 @@ extern int init_main(int argc, char **argv)
        signal(SIGCONT, cont_handler);
        signal(SIGSTOP, stop_handler);
        signal(SIGTSTP, stop_handler);
-       signal(SIGCHLD, SIG_IGN);
 
        /* Turn off rebooting via CTL-ALT-DEL -- we get a 
         * SIGINT on CAD so we can shut things down gracefully... */