diff --git a/porting/linux/user/src/thread/pthread_create.c b/porting/linux/user/src/thread/pthread_create.c
index c0fc725f5b180caa3bdccac5c2661ab1e69b0e1d..1c55f01d6716c5d691d32a22de6c6fcb4ecd2215 100644
--- a/porting/linux/user/src/thread/pthread_create.c
+++ b/porting/linux/user/src/thread/pthread_create.c
@@ -10,6 +10,7 @@
 #include <string.h>
 #include <stddef.h>
 #include <stdarg.h>
+#include <pthread.h>
 
 pid_t getpid(void);
 
@@ -287,6 +288,8 @@ struct start_args {
 	void *start_arg;
 	volatile int control;
 	unsigned long sig_mask[_NSIG/8/sizeof(long)];
+
+	pthread_mutex_t startup_handshake_lock;
 };
 
 #ifdef ENABLE_HWASAN
@@ -297,7 +300,11 @@ static int start(void *p)
 #ifdef ENABLE_HWASAN
 	__hwasan_thread_enter();
 #endif
+	
 	struct start_args *args = p;
+	
+	pthread_mutex_lock(&args->startup_handshake_lock);
+	
 	int state = args->control;
 	if (state) {
 		if (a_cas(&args->control, 1, 2)==1)
@@ -326,7 +333,11 @@ static int start_c11(void *p)
 #ifdef ENABLE_HWASAN
 	__hwasan_thread_enter();
 #endif
+	
 	struct start_args *args = p;
+	
+	pthread_mutex_lock(&args->startup_handshake_lock);
+	
 	int (*start)(void*) = (int(*)(void*)) args->start_func;
 	__pthread_exit((void *)(uintptr_t)start(args->start_arg));
 	return 0;
@@ -482,6 +493,11 @@ int __pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict att
 		~(1UL<<((SIGCANCEL-1)%(8*sizeof(long))));
 
 	__tl_lock();
+
+	pthread_mutex_init(&args->startup_handshake_lock, NULL);
+
+	pthread_mutex_lock(&args->startup_handshake_lock);
+
 	if (!libc.threads_minus_1++) libc.need_locks = 1;
 	ret = __clone((c11 ? start_c11 : start), stack, flags, args, &new->tid, TP_ADJ(new), &__thread_list_lock);
 
@@ -521,6 +537,9 @@ int __pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict att
 	}
 
 	*res = new;
+	
+	pthread_mutex_unlock(&args->startup_handshake_lock);
+	
 	return 0;
 fail:
 	__release_ptc();