diff --git a/env/posix/ocf_env.h b/env/posix/ocf_env.h
index 0d49e8b..64f568d 100644
--- a/env/posix/ocf_env.h
+++ b/env/posix/ocf_env.h
@@ -189,7 +189,7 @@ static inline int env_mutex_init(env_mutex *mutex)
 
 static inline void env_mutex_lock(env_mutex *mutex)
 {
-	pthread_mutex_lock(&mutex->m);
+	ENV_BUG_ON(pthread_mutex_lock(&mutex->m));
 }
 
 static inline int env_mutex_lock_interruptible(env_mutex *mutex)
@@ -205,7 +205,7 @@ static inline int env_mutex_trylock(env_mutex *mutex)
 
 static inline void env_mutex_unlock(env_mutex *mutex)
 {
-	pthread_mutex_unlock(&mutex->m);
+	ENV_BUG_ON(pthread_mutex_unlock(&mutex->m));
 }
 
 static inline int env_mutex_is_locked(env_mutex *mutex)
@@ -270,7 +270,7 @@ static inline void env_rwsem_up_read(env_rwsem *s)
 
 static inline void env_rwsem_down_read(env_rwsem *s)
 {
-	pthread_rwlock_rdlock(&s->lock);
+	ENV_BUG_ON(pthread_rwlock_rdlock(&s->lock));
 }
 
 static inline int env_rwsem_down_read_trylock(env_rwsem *s)
@@ -280,12 +280,12 @@ static inline int env_rwsem_down_read_trylock(env_rwsem *s)
 
 static inline void env_rwsem_up_write(env_rwsem *s)
 {
-	pthread_rwlock_unlock(&s->lock);
+	ENV_BUG_ON(pthread_rwlock_unlock(&s->lock));
 }
 
 static inline void env_rwsem_down_write(env_rwsem *s)
 {
-	pthread_rwlock_wrlock(&s->lock);
+	ENV_BUG_ON(pthread_rwlock_wrlock(&s->lock));
 }
 
 static inline int env_rwsem_down_write_trylock(env_rwsem *s)
@@ -486,17 +486,17 @@ typedef struct {
 
 static inline void env_spinlock_init(env_spinlock *l)
 {
-	pthread_spin_init(&l->lock, 0);
+	ENV_BUG_ON(pthread_spin_init(&l->lock, 0));
 }
 
 static inline void env_spinlock_lock(env_spinlock *l)
 {
-	pthread_spin_lock(&l->lock);
+	ENV_BUG_ON(pthread_spin_lock(&l->lock));
 }
 
 static inline void env_spinlock_unlock(env_spinlock *l)
 {
-	pthread_spin_unlock(&l->lock);
+	ENV_BUG_ON(pthread_spin_unlock(&l->lock));
 }
 
 static inline void env_spinlock_lock_irq(env_spinlock *l)
@@ -525,27 +525,27 @@ typedef struct {
 
 static inline void env_rwlock_init(env_rwlock *l)
 {
-	pthread_rwlock_init(&l->lock, NULL);
+	ENV_BUG_ON(pthread_rwlock_init(&l->lock, NULL));
 }
 
 static inline void env_rwlock_read_lock(env_rwlock *l)
 {
-	pthread_rwlock_rdlock(&l->lock);
+	ENV_BUG_ON(pthread_rwlock_rdlock(&l->lock));
 }
 
 static inline void env_rwlock_read_unlock(env_rwlock *l)
 {
-	pthread_rwlock_unlock(&l->lock);
+	ENV_BUG_ON(pthread_rwlock_unlock(&l->lock));
 }
 
 static inline void env_rwlock_write_lock(env_rwlock *l)
 {
-	pthread_rwlock_wrlock(&l->lock);
+	ENV_BUG_ON(pthread_rwlock_wrlock(&l->lock));
 }
 
 static inline void env_rwlock_write_unlock(env_rwlock *l)
 {
-	pthread_rwlock_unlock(&l->lock);
+	ENV_BUG_ON(pthread_rwlock_unlock(&l->lock));
 }
 
 /* *** WAITQUEUE *** */
diff --git a/src/mngt/ocf_mngt_cache.c b/src/mngt/ocf_mngt_cache.c
index 0b17207..e195608 100644
--- a/src/mngt/ocf_mngt_cache.c
+++ b/src/mngt/ocf_mngt_cache.c
@@ -672,8 +672,8 @@ static int _ocf_mngt_init_prepare_cache(struct ocf_cache_mngt_init_params *param
 	}
 
 	if (cfg->name) {
-		ret = env_strncpy(cache_name, sizeof(cache_name),
-				cfg->name, sizeof(cache_name));
+		ret = env_strncpy(cache_name, sizeof(cache_name) - 1,
+				cfg->name, sizeof(cache_name) - 1);
 		if (ret)
 			goto out;
 	} else {
@@ -1064,7 +1064,7 @@ uint64_t _ocf_mngt_calculate_ram_needed(ocf_cache_t cache,
 int ocf_mngt_get_ram_needed(ocf_cache_t cache,
 		struct ocf_mngt_cache_device_config *cfg, uint64_t *ram_needed)
 {
-	struct ocf_volume volume;
+	struct ocf_volume *volume = &cache->device->volume;
 	ocf_volume_type_t type;
 	int result;
 
@@ -1076,21 +1076,21 @@ int ocf_mngt_get_ram_needed(ocf_cache_t cache,
 	if (!type)
 		return -OCF_ERR_INVAL_VOLUME_TYPE;
 
-	result = ocf_volume_init(&cache->device->volume, type,
+	result = ocf_volume_init(volume, type,
 			&cfg->uuid, false);
 	if (result)
 		return result;
 
-	result = ocf_volume_open(&volume, cfg->volume_params);
+	result = ocf_volume_open(volume, cfg->volume_params);
 	if (result) {
-		ocf_volume_deinit(&volume);
+		ocf_volume_deinit(volume);
 		return result;
 	}
 
-	*ram_needed = _ocf_mngt_calculate_ram_needed(cache, &volume);
+	*ram_needed = _ocf_mngt_calculate_ram_needed(cache, volume);
 
-	ocf_volume_close(&volume);
-	ocf_volume_deinit(&volume);
+	ocf_volume_close(volume);
+	ocf_volume_deinit(volume);
 
 	return 0;
 }
@@ -1149,7 +1149,7 @@ static void _ocf_mngt_attach_handle_error(
 		env_vfree(cache->device);
 }
 
-static int _ocf_mngt_cache_init(ocf_cache_t cache,
+static void _ocf_mngt_cache_init(ocf_cache_t cache,
 		struct ocf_cache_mngt_init_params *params)
 {
 	int i;
@@ -1173,8 +1173,6 @@ static int _ocf_mngt_cache_init(ocf_cache_t cache,
 	__init_cores(cache);
 	__init_metadata_version(cache);
 	__init_partitions(cache);
-
-	return 0;
 }
 
 static int _ocf_mngt_cache_start(ocf_ctx_t ctx, ocf_cache_t *cache,
@@ -1213,9 +1211,7 @@ static int _ocf_mngt_cache_start(ocf_ctx_t ctx, ocf_cache_t *cache,
 	ocf_log(ctx, log_debug, "Metadata initialized\n");
 	params.flags.metadata_inited = true;
 
-	result = _ocf_mngt_cache_init(*cache, &params);
-	if (result)
-		goto _cache_mngt_init_instance_ERROR;
+	_ocf_mngt_cache_init(*cache, &params);
 
 	ocf_ctx_get(ctx);
 
diff --git a/src/mngt/ocf_mngt_core.c b/src/mngt/ocf_mngt_core.c
index c410397..c6c0a3f 100644
--- a/src/mngt/ocf_mngt_core.c
+++ b/src/mngt/ocf_mngt_core.c
@@ -892,10 +892,8 @@ int ocf_mngt_core_set_user_metadata(ocf_core_t core, void *data, size_t size)
 	if (size > OCF_CORE_USER_DATA_SIZE)
 		return -EINVAL;
 
-	env_memcpy(core->conf_meta->user_data,
+	return env_memcpy(core->conf_meta->user_data,
 			OCF_CORE_USER_DATA_SIZE, data, size);
-
-	return 0;
 }
 
 int ocf_mngt_core_get_user_metadata(ocf_core_t core, void *data, size_t size)
@@ -906,10 +904,8 @@ int ocf_mngt_core_get_user_metadata(ocf_core_t core, void *data, size_t size)
 	if (size > sizeof(core->conf_meta->user_data))
 		return -EINVAL;
 
-	env_memcpy(data, size, core->conf_meta->user_data,
+	return env_memcpy(data, size, core->conf_meta->user_data,
 			OCF_CORE_USER_DATA_SIZE);
-
-	return 0;
 }
 
 static int _cache_mngt_set_core_seq_cutoff_threshold(ocf_core_t core, void *cntx)
diff --git a/src/mngt/ocf_mngt_flush.c b/src/mngt/ocf_mngt_flush.c
index 48f8859..69684d4 100644
--- a/src/mngt/ocf_mngt_flush.c
+++ b/src/mngt/ocf_mngt_flush.c
@@ -505,6 +505,7 @@ static void _ocf_mngt_flush_core(
 		ocf_core_log(core, log_err, "Flushing operation aborted, "
 				"no memory\n");
 		env_vfree(fc);
+		ocf_metadata_unlock(cache, OCF_METADATA_WR);
 		complete(context, -OCF_ERR_NO_MEM);
 		return;
 	}
@@ -540,6 +541,7 @@ static void _ocf_mngt_flush_all_cores(
 	if (ret) {
 		ocf_cache_log(cache, log_err, "Flushing operation aborted, "
 				"no memory\n");
+		ocf_metadata_unlock(cache, OCF_METADATA_WR);
 		complete(context, ret);
 		return;
 	}
diff --git a/src/ocf_cache.c b/src/ocf_cache.c
index dbf7bb8..02470ef 100644
--- a/src/ocf_cache.c
+++ b/src/ocf_cache.c
@@ -26,7 +26,7 @@ ocf_cache_id_t ocf_cache_get_id(ocf_cache_t cache)
 int ocf_cache_set_name(ocf_cache_t cache, const char *src, size_t src_size)
 {
 	OCF_CHECK_NULL(cache);
-	return env_strncpy(cache->name, sizeof(cache->name), src, src_size);
+	return env_strncpy(cache->name, OCF_CACHE_NAME_SIZE - 1, src, src_size);
 }
 
 const char *ocf_cache_get_name(ocf_cache_t cache)
diff --git a/src/ocf_core.c b/src/ocf_core.c
index d0b9646..f6d66da 100644
--- a/src/ocf_core.c
+++ b/src/ocf_core.c
@@ -54,7 +54,7 @@ int ocf_core_set_name(ocf_core_t core, const char *src, size_t src_size)
 	OCF_CHECK_NULL(core);
 	OCF_CHECK_NULL(src);
 
-	return env_strncpy(core->name, sizeof(core->name), src, src_size);
+	return env_strncpy(core->name, OCF_CORE_NAME_SIZE - 1, src, src_size);
 }
 
 const char *ocf_core_get_name(ocf_core_t core)
@@ -76,7 +76,7 @@ bool ocf_core_is_valid(ocf_cache_t cache, ocf_core_id_t id)
 {
 	OCF_CHECK_NULL(cache);
 
-	if (id > OCF_CORE_ID_MAX || id < OCF_CORE_ID_MIN)
+	if (id > OCF_CORE_ID_MAX)
 		return false;
 
 	if (!env_bit_test(id, cache->conf_meta->valid_core_bitmap))
diff --git a/src/ocf_io_class.c b/src/ocf_io_class.c
index 6ded6d1..ad28306 100644
--- a/src/ocf_io_class.c
+++ b/src/ocf_io_class.c
@@ -27,7 +27,7 @@ int ocf_cache_io_class_get_info(ocf_cache_t cache, uint32_t io_class,
 		return -OCF_ERR_IO_CLASS_NOT_EXIST;
 	}
 
-	if (env_strncpy(info->name, sizeof(info->name),
+	if (env_strncpy(info->name, OCF_IO_CLASS_NAME_MAX - 1,
 			cache->user_parts[part_id].config->name,
 			sizeof(cache->user_parts[part_id].config->name))) {
 		return -OCF_ERR_INVAL;
diff --git a/src/ocf_stats.c b/src/ocf_stats.c
index 1e6f76d..0cb49e0 100644
--- a/src/ocf_stats.c
+++ b/src/ocf_stats.c
@@ -172,7 +172,7 @@ int ocf_core_io_class_get_stats(ocf_core_t core, ocf_part_id_t part_id,
 	OCF_CHECK_NULL(core);
 	OCF_CHECK_NULL(stats);
 
-	if (part_id < OCF_IO_CLASS_ID_MIN || part_id > OCF_IO_CLASS_ID_MAX)
+	if (part_id > OCF_IO_CLASS_ID_MAX)
 		return -OCF_ERR_INVAL;
 
 	cache = ocf_core_get_cache(core);
diff --git a/src/utils/utils_cache_line.c b/src/utils/utils_cache_line.c
index 1d4ad33..3777aa1 100644
--- a/src/utils/utils_cache_line.c
+++ b/src/utils/utils_cache_line.c
@@ -22,10 +22,11 @@ static void __set_cache_line_invalid(struct ocf_cache *cache, uint8_t start_bit,
 		uint8_t end_bit, ocf_cache_line_t line,
 		ocf_core_id_t core_id, ocf_part_id_t part_id)
 {
-	ocf_core_t core = ocf_cache_get_core(cache, core_id);
+	ocf_core_t core;
 	bool is_valid;
 
 	ENV_BUG_ON(core_id >= OCF_CORE_MAX);
+	core = ocf_cache_get_core(cache, core_id);
 
 	if (metadata_clear_valid_sec_changed(cache, line, start_bit, end_bit,
 			&is_valid)) {
diff --git a/src/utils/utils_part.c b/src/utils/utils_part.c
index 3da1869..31faab7 100644
--- a/src/utils/utils_part.c
+++ b/src/utils/utils_part.c
@@ -79,12 +79,10 @@ static int ocf_part_lst_cmp_valid(struct ocf_cache *cache,
 	return v2 - v1;
 }
 
-int ocf_part_init(struct ocf_cache *cache)
+void ocf_part_init(struct ocf_cache *cache)
 {
 	ocf_lst_init(cache, &cache->lst_part, OCF_IO_CLASS_MAX,
 			ocf_part_lst_getter_valid, ocf_part_lst_cmp_valid);
-
-	return 0;
 }
 
 void ocf_part_move(struct ocf_request *req)
diff --git a/src/utils/utils_part.h b/src/utils/utils_part.h
index 23f477f..c37684c 100644
--- a/src/utils/utils_part.h
+++ b/src/utils/utils_part.h
@@ -10,7 +10,7 @@
 #include "../engine/cache_engine.h"
 #include "../metadata/metadata_partition.h"
 
-int ocf_part_init(struct ocf_cache *cache);
+void ocf_part_init(struct ocf_cache *cache);
 
 static inline bool ocf_part_is_valid(struct ocf_user_part *part)
 {