Index: head/tests/sys/kern/ptrace_test.c
===================================================================
--- head/tests/sys/kern/ptrace_test.c
+++ head/tests/sys/kern/ptrace_test.c
@@ -304,7 +304,7 @@
 		ATF_REQUIRE(write(dpipe[1], &c, sizeof(c)) == sizeof(c));
 
 		/* Wait for parent's failed wait. */
-		ATF_REQUIRE(read(dpipe[1], &c, sizeof(c)) == 0);
+		ATF_REQUIRE(read(dpipe[1], &c, sizeof(c)) == sizeof(c));
 
 		wpid = waitpid(child, &status, 0);
 		ATF_REQUIRE(wpid == child);
@@ -313,6 +313,7 @@
 
 		exit(0);
 	}
+	close(dpipe[1]);
 
 	/* Parent process. */
 
@@ -365,10 +366,11 @@
 	ATF_REQUIRE(wpid == 0);
 
 	/* Signal the debugger to wait for the child. */
-	close(dpipe[0]);
+	ATF_REQUIRE(write(dpipe[0], &c, sizeof(c)) == sizeof(c));
 
 	/* Wait for the debugger. */
-	ATF_REQUIRE(read(dpipe[1], &c, sizeof(c)) == 0);
+	ATF_REQUIRE(read(dpipe[0], &c, sizeof(c)) == 0);
+	close(dpipe[0]);
 
 	/* The child process should now be ready. */
 	wpid = waitpid(child, &status, WNOHANG);