diff --git a/app/nginx-1.11.10/src/core/ngx_murmurhash.c b/app/nginx-1.11.10/src/core/ngx_murmurhash.c
index c31e0e035..5ade658dd 100644
--- a/app/nginx-1.11.10/src/core/ngx_murmurhash.c
+++ b/app/nginx-1.11.10/src/core/ngx_murmurhash.c
@@ -35,8 +35,10 @@ ngx_murmur_hash2(u_char *data, size_t len)
     switch (len) {
     case 3:
         h ^= data[2] << 16;
+        /* fall through */
     case 2:
         h ^= data[1] << 8;
+        /* fall through */
     case 1:
         h ^= data[0];
         h *= 0x5bd1e995;
diff --git a/app/nginx-1.11.10/src/http/ngx_http_parse.c b/app/nginx-1.11.10/src/http/ngx_http_parse.c
index 9f9947316..c65f01529 100644
--- a/app/nginx-1.11.10/src/http/ngx_http_parse.c
+++ b/app/nginx-1.11.10/src/http/ngx_http_parse.c
@@ -1390,6 +1390,7 @@ ngx_http_parse_complex_uri(ngx_http_request_t *r, ngx_uint_t merge_slashes)
                 goto done;
             case '+':
                 r->plus_in_uri = 1;
+                /* fall through */
             default:
                 state = sw_usual;
                 *u++ = ch;
@@ -1431,6 +1432,7 @@ ngx_http_parse_complex_uri(ngx_http_request_t *r, ngx_uint_t merge_slashes)
                 goto done;
             case '+':
                 r->plus_in_uri = 1;
+                /* fall through */
             default:
                 state = sw_usual;
                 *u++ = ch;
@@ -1478,6 +1480,7 @@ ngx_http_parse_complex_uri(ngx_http_request_t *r, ngx_uint_t merge_slashes)
                 goto done;
             case '+':
                 r->plus_in_uri = 1;
+                /* fall through */
             default:
                 state = sw_usual;
                 *u++ = ch;
diff --git a/app/nginx-1.11.10/src/os/unix/ngx_process.c b/app/nginx-1.11.10/src/os/unix/ngx_process.c
index 24a63fbf5..81009c40c 100644
--- a/app/nginx-1.11.10/src/os/unix/ngx_process.c
+++ b/app/nginx-1.11.10/src/os/unix/ngx_process.c
@@ -405,6 +405,7 @@ ngx_signal_handler(int signo)
                 break;
             }
             ngx_debug_quit = 1;
+            /* fall through */
         case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
             ngx_quit = 1;
             action = ", shutting down";
diff --git a/app/nginx-1.11.10/src/os/unix/ngx_process_cycle.c b/app/nginx-1.11.10/src/os/unix/ngx_process_cycle.c
index aea167acb..1f646f96a 100644
--- a/app/nginx-1.11.10/src/os/unix/ngx_process_cycle.c
+++ b/app/nginx-1.11.10/src/os/unix/ngx_process_cycle.c
@@ -385,7 +385,12 @@ ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n, ngx_int_t type)
                       "start worker processes shm_open");
         exit(2);
     }
-    (void) ftruncate(shm_fd, sizeof(sem_t));
+    r = ftruncate(shm_fd, sizeof(sem_t));
+    if (r == -1) {
+        ngx_log_error(NGX_LOG_ERR, cycle->log, ngx_errno,
+                      "start worker processes ftruncate");
+        exit(2);
+    }
     ngx_ff_worker_sem = (sem_t *) mmap(NULL, sizeof(sem_t),
                       PROT_READ|PROT_WRITE,MAP_SHARED, shm_fd, 0);
     if (ngx_ff_worker_sem == MAP_FAILED) {