diff --git a/launcher.c b/launcher.c
index 5c70330..741c506 100644
--- a/launcher.c
+++ b/launcher.c
@@ -30,6 +30,7 @@ void print_help(char *self) {
     LOG_WARN("  --file_output      path to output file");
     LOG_WARN("  --file_info        path to info file");
     LOG_WARN("  --program          program to run");
+    LOG_WARN("  --program_arg      program argument (only accept one argument)");
     LOG_WARN("  --help             print this help message");
 }
 
@@ -46,6 +47,7 @@ void parse(int argc, char *argv[]) {
         [CFG_FILE_OUTPUT]      = {"file_output",      required_argument, NULL, 0},
         [CFG_FILE_INFO]        = {"file_info",        required_argument, NULL, 0},
         [CFG_PROGRAM]          = {"program",          required_argument, NULL, 0},
+        [CFG_PROGRAM_ARG]      = {"program_arg",      required_argument, NULL, 0},
         [CFG_IS_VALID]         = {"help",             no_argument,       NULL, 0},
         [CFG_IS_VALID + 1]     = {NULL,               0,                 NULL, 0}
     };
@@ -74,7 +76,7 @@ void parse(int argc, char *argv[]) {
 }
 
 void launch_child() {
-    char *args[] = {config[CFG_PROGRAM], NULL};
+    char *args[] = {config[CFG_PROGRAM], config[CFG_PROGRAM_ARG], NULL};
 
     /* build stdin */ {
         int fd = open(config[CFG_FILE_INPUT], O_RDONLY);
@@ -141,6 +143,8 @@ int main(int argc, char *argv[]) {
             ret = wait4(child, &status, 0, &usage);
             clock_gettime(CLOCK_MONOTONIC, &time_end);
 
+            // LOG_DEBUG("Children exited, status = %d, ret = %d", status, ret);
+
             long long time_usage =
                 (time_end.tv_sec - time_begin.tv_sec) * 1000 + (time_end.tv_nsec - time_begin.tv_nsec) / 1000000;
 
diff --git a/launcher.h b/launcher.h
index 3fa36a3..0dc3eb8 100644
--- a/launcher.h
+++ b/launcher.h
@@ -13,6 +13,7 @@ enum ConfigIndex {
     CFG_FILE_OUTPUT,
     CFG_FILE_INFO,
     CFG_PROGRAM,
+    CFG_PROGRAM_ARG,
     CFG_IS_VALID
 };
 
diff --git a/rules/lang_c_cpp.c b/rules/lang_c_cpp.c
index 5e7d3e1..3e362cf 100644
--- a/rules/lang_c_cpp.c
+++ b/rules/lang_c_cpp.c
@@ -8,7 +8,6 @@ void setup_lang_c_cpp(scmp_filter_ctx ctx) {
         SCMP_SYS(clone),           // 56
         SCMP_SYS(futex),           // 202
         SCMP_SYS(set_tid_address), // 218
-        SCMP_SYS(exit_group),      // 231
         SCMP_SYS(set_robust_list), // 273
         SCMP_SYS(get_robust_list), // 274
         SCMP_SYS(rseq),            // 334
diff --git a/rules/lang_go.c b/rules/lang_go.c
index 94492c6..ac857e4 100644
--- a/rules/lang_go.c
+++ b/rules/lang_go.c
@@ -11,7 +11,6 @@ void setup_lang_go(scmp_filter_ctx ctx) {
         SCMP_SYS(sigaltstack),       // 131
         SCMP_SYS(gettid),            // 186
         SCMP_SYS(sched_getaffinity), // 204
-        SCMP_SYS(exit_group),        // 231
     };
     ADD_RULE_LIST(white, SCMP_ACT_ALLOW);
 }
diff --git a/rules/rules.c b/rules/rules.c
index 0262458..453b3f2 100644
--- a/rules/rules.c
+++ b/rules/rules.c
@@ -43,6 +43,7 @@ void setup_common(scmp_filter_ctx ctx, const char *exe_path) {
         SCMP_SYS(clock_gettime),   // 228
         SCMP_SYS(clock_getres),    // 229
         SCMP_SYS(clock_nanosleep), // 230
+        SCMP_SYS(exit_group),      // 231
         SCMP_SYS(newfstatat),      // 262
         SCMP_SYS(getrandom),       // 318
 
diff --git a/utils/log.h b/utils/log.h
index 9297f20..c6bcd79 100644
--- a/utils/log.h
+++ b/utils/log.h
@@ -7,6 +7,7 @@
 #define COLOR_RED          "\x1B[1;31m"
 #define COLOR_YELLOW       "\x1B[1;33m"
 #define COLOR_GREEN        "\x1B[1;32m"
+#define COLOR_GRAY         "\x1B[1;37m"
 #define COLOR_STDOUT_RESET "\x1B[0m"
 
 #define _LOG(color, level, fmt, ...)                                                                     \
@@ -15,8 +16,9 @@
                 ##__VA_ARGS__);                                                                          \
     } while (0)
 
-#define LOG_INFO(fmt, ...) _LOG(COLOR_GREEN, "I", fmt, ##__VA_ARGS__)
-#define LOG_WARN(fmt, ...) _LOG(COLOR_YELLOW, "W", fmt, ##__VA_ARGS__)
-#define LOG_ERR(fmt, ...)  _LOG(COLOR_RED, "E", fmt, ##__VA_ARGS__)
+#define LOG_DEBUG(fmt, ...) _LOG(COLOR_GRAY, "D", fmt, ##__VA_ARGS__)
+#define LOG_INFO(fmt, ...)  _LOG(COLOR_GREEN, "I", fmt, ##__VA_ARGS__)
+#define LOG_WARN(fmt, ...)  _LOG(COLOR_YELLOW, "W", fmt, ##__VA_ARGS__)
+#define LOG_ERR(fmt, ...)   _LOG(COLOR_RED, "E", fmt, ##__VA_ARGS__)
 
 #endif // WOJ_SANDBOX_LOG_H