diff --git a/src/section_list.c b/src/section_list.c
index 2c74754..e1620e0 100644
--- a/src/section_list.c
+++ b/src/section_list.c
@@ -16,6 +16,7 @@
 #include "user_list.h"
 #include <errno.h>
 #include <fcntl.h>
+#include <pthread.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -78,6 +79,9 @@ typedef struct article_block_pool_t ARTICLE_BLOCK_POOL;
 static char article_block_shm_name[FILE_NAME_LEN];
 static ARTICLE_BLOCK_POOL *p_article_block_pool = NULL;
 
+/* Spinlock for protecting free list operations */
+static pthread_spinlock_t free_list_spinlock;
+
 static char section_list_shm_name[FILE_NAME_LEN];
 SECTION_LIST_POOL *p_section_list_pool = NULL;
 
@@ -102,6 +106,13 @@ int article_block_init(const char *filename, int block_count)
 		return -1;
 	}
 
+	/* Initialize spinlock for free list protection */
+	if (pthread_spin_init(&free_list_spinlock, PTHREAD_PROCESS_PRIVATE) != 0)
+	{
+		log_error("pthread_spin_init error");
+		return -1;
+	}
+
 	if (block_count <= 0 || block_count > ARTICLE_BLOCK_PER_POOL)
 	{
 		log_error("article_block_count exceed limit %d", ARTICLE_BLOCK_PER_POOL);
@@ -310,6 +321,9 @@ int detach_article_block_shm(void)
 
 	p_article_block_pool = NULL;
 
+	/* Destroy spinlock */
+	pthread_spin_destroy(&free_list_spinlock);
+
 	return 0;
 }
 
@@ -317,6 +331,8 @@ inline static ARTICLE_BLOCK *pop_free_article_block(void)
 {
 	ARTICLE_BLOCK *p_block = NULL;
 
+	pthread_spin_lock(&free_list_spinlock);
+
 	if (p_article_block_pool->p_block_free_list != NULL)
 	{
 		p_block = p_article_block_pool->p_block_free_list;
@@ -325,13 +341,19 @@ inline static ARTICLE_BLOCK *pop_free_article_block(void)
 		p_block->article_count = 0;
 	}
 
+	pthread_spin_unlock(&free_list_spinlock);
+
 	return p_block;
 }
 
 inline static void push_free_article_block(ARTICLE_BLOCK *p_block)
 {
+	pthread_spin_lock(&free_list_spinlock);
+
 	p_block->p_next_block = p_article_block_pool->p_block_free_list;
 	p_article_block_pool->p_block_free_list = p_block;
+
+	pthread_spin_unlock(&free_list_spinlock);
 }
 
 int article_block_reset(void)