diff --git a/backend.c b/backend.c
index e65af52..1f5f3c7 100644
--- a/backend.c
+++ b/backend.c
@@ -56,13 +56,13 @@
 static char *cgroup_mnt;
 static int exit_value;
 static volatile int fio_abort;
+static unsigned int nr_process = 0;
+static unsigned int nr_thread = 0;
 
 struct io_log *agg_io_log[2];
 
 int groupid = 0;
 unsigned int thread_number = 0;
-unsigned int nr_process = 0;
-unsigned int nr_thread = 0;
 int shm_id = 0;
 int temp_stall_ts;
 unsigned long done_secs = 0;
@@ -998,6 +998,7 @@
 	 * eating a file descriptor
 	 */
 	fio_mutex_remove(td->mutex);
+	td->mutex = NULL;
 
 	/*
 	 * A new gid requires privilege, so we need to do this before setting
@@ -1359,6 +1360,14 @@
 
 	set_sig_handlers();
 
+	nr_thread = nr_process = 0;
+	for_each_td(td, i) {
+		if (td->o.use_thread)
+			nr_thread++;
+		else
+			nr_process++;
+	}
+
 	if (!terse_output) {
 		log_info("Starting ");
 		if (nr_thread)
diff --git a/fio.h b/fio.h
index 919c6cd..28198b9 100644
--- a/fio.h
+++ b/fio.h
@@ -310,7 +310,6 @@
 
 extern int exitall_on_terminate;
 extern unsigned int thread_number;
-extern unsigned int nr_process, nr_thread;
 extern int shm_id;
 extern int groupid;
 extern int terse_output;
diff --git a/init.c b/init.c
index eccd3af..8c9faec 100644
--- a/init.c
+++ b/init.c
@@ -775,11 +775,6 @@
 	if (ioengine_load(td))
 		goto err;
 
-	if (td->o.use_thread)
-		nr_thread++;
-	else
-		nr_process++;
-
 	if (td->o.odirect)
 		td->io_ops->flags |= FIO_RAWIO;
 
diff --git a/libfio.c b/libfio.c
index 95938c8..acdb0ea 100644
--- a/libfio.c
+++ b/libfio.c
@@ -133,8 +133,6 @@
 {
 	groupid = 0;
 	thread_number = 0;
-	nr_process = 0;
-	nr_thread = 0;
 	done_secs = 0;
 }