test: check, that parasite can rollback itself (v2)

This test uses systemtap to replace random parasite command on
invalide command. The parasite code received this command and should
rollback itself. CRIU didn't recived ack, should understand that
something wrong and exits. The systemtap inverts exit code of criu.

"zdtm.sh -d" is used for executing tests and testing that the state of
processes don't corrupted.

criu should be compiled without optimizations (make DEBUG=1)

v2: randomize a command, which will be replaced
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/Makefile

@@ -3,12 +3,18 @@ EXP = '^ns/(?!.*(tty|pty))'
 
 .FORCE:
 
+all: .FORCE
+	$(MAKE) zdtm
+
 zdtm: .FORCE
 	$(MAKE) zdtm_ns
 	for t in $(shell echo "$(TST)" | tr ' ' '\n' | grep -Pv $(EXP)); do \
 		$(MAKE) $$t || break;	\
 	done
-	
+
+fault-injection: .FORCE
+	$(MAKE) -C fault-injection
+
 zdtm_ns: $(shell echo "$(TST)" | tr ' ' '\n' | grep -P $(EXP))
 $(TST):
 	./zdtm.sh $(@) &> $(subst /,_,$@).log

test/fault-injection/Makefile

+all:
+	stap -g -d ../../criu parasite.stp $$RANDOM -c 'bash -x ../zdtm.sh -d -x socket-tcp'

test/fault-injection/parasite.stp

+global i, n, fini_cmd = -1, last_cmd
+
+probe process("../../criu").begin
+{
+	i = 0;
+	/* randint() returns numbers multiple of 5 */
+	n = randint(20 * 5) / 5
+	printf("The %d command will be replaced on -1\n", n);
+}
+
+probe process("../../criu").function("__parasite_execute_daemon")
+{
+	printf("%s\n", $$parms);
+	last_cmd = $cmd;
+	if (++i > n) {
+		printf("Send invalid command to parasite\n");
+		$cmd = -1;
+	}
+}
+
+probe process("../../criu").function("__parasite_execute_daemon").return
+{
+	printf("%d\n", $return);
+}
+
+probe process("../../criu").function("main").return
+{
+	printf("CRIU exits with code %d\n", $return);
+	if  ( i > n) {
+		if ($return)
+			$return = 0;
+		else {
+			printf("CRIU exited with zero code\n");
+			if (fini_cmd < 0 || fini_cmd == last_cmd) {
+				printf("%d looks like FINI command\n", n);
+				fini_cmd = last_cmd
+			} else {
+				printf("This is the second FINI command %d (%d)",
+								n, fini_cmd);
+				$return = 1;
+			}
+		}
+	}
+}