https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=232371

diff -u -rup gdb-6.6-orig/gdb/linux-nat.c gdb-6.6/gdb/linux-nat.c

--- gdb-6.6-orig/gdb/linux-nat.c	2007-03-15 19:55:40.000000000 -0400

+++ gdb-6.6/gdb/linux-nat.c	2007-03-15 20:02:09.000000000 -0400

@@ -1014,6 +1014,10 @@ lin_lwp_attach_lwp (ptid_t ptid, int ver

 	{

 	  /* Try again with __WCLONE to check cloned processes.  */

 	  pid = my_waitpid (GET_LWP (ptid), &status, __WCLONE);

+	  if (pid == -1 && errno == ECHILD)

+	    error (_("Can't attach %s (%s) - possible SELinux denial,"

+		     " check your /var/log/messages for `avc: denied'"),

+		   target_pid_to_str (ptid), safe_strerror (errno));

 	  lp->cloned = 1;

 	}