devel/gdb/files/patch-gdb_fbsd-nat.c


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--- gdb/fbsd-nat.c.orig	2019-05-11 11:19:03.000000000 -0700
+++ gdb/fbsd-nat.c	2019-05-24 16:25:52.961523000 -0700
@@ -1178,6 +1178,14 @@ fbsd_nat_target::resume (ptid_t ptid, int step, enum g
       /* If ptid is a specific LWP, suspend all other LWPs in the process.  */
       inferior *inf = find_inferior_ptid (ptid);
 
+#ifndef PT_LWP_EVENTS
+      /* When LWP events are not supported, a new thread might already be
+	 running that has not yet reported an event when GDB wishes to
+	 only run a single thread.  Force an update of the thread list
+	 to ensure that any such threads are suspended before the process
+	 is resumed.  */
+      fbsd_add_threads (ptid.pid ());
+#endif
       for (thread_info *tp : inf->non_exited_threads ())
         {
 	  int request;