diff --git a/cfg/tarantool_box_cfg.c b/cfg/tarantool_box_cfg.c
index 67af7b7910c23afb578dcd06f2b21a3d9980abd6..f863dead7eac48548b4da5c9fb7b88c07d0d7f46 100644
--- a/cfg/tarantool_box_cfg.c
+++ b/cfg/tarantool_box_cfg.c
@@ -1814,10 +1814,10 @@ int
 dup_tarantool_cfg(tarantool_cfg* dst, tarantool_cfg* src) {
 	tarantool_cfg_iterator_t iterator, *i = &iterator;
 
-	dst->username = src->username == NULL ? NULL : strdup(src->username);
+	if (dst->username) free(dst->username);dst->username = src->username == NULL ? NULL : strdup(src->username);
 	if (src->username != NULL && dst->username == NULL)
 		return CNF_NOMEMORY;
-	dst->bind_ipaddr = src->bind_ipaddr == NULL ? NULL : strdup(src->bind_ipaddr);
+	if (dst->bind_ipaddr) free(dst->bind_ipaddr);dst->bind_ipaddr = src->bind_ipaddr == NULL ? NULL : strdup(src->bind_ipaddr);
 	if (src->bind_ipaddr != NULL && dst->bind_ipaddr == NULL)
 		return CNF_NOMEMORY;
 	dst->coredump = src->coredump;
@@ -1827,29 +1827,29 @@ dup_tarantool_cfg(tarantool_cfg* dst, tarantool_cfg* src) {
 	dst->slab_alloc_arena = src->slab_alloc_arena;
 	dst->slab_alloc_minimal = src->slab_alloc_minimal;
 	dst->slab_alloc_factor = src->slab_alloc_factor;
-	dst->work_dir = src->work_dir == NULL ? NULL : strdup(src->work_dir);
+	if (dst->work_dir) free(dst->work_dir);dst->work_dir = src->work_dir == NULL ? NULL : strdup(src->work_dir);
 	if (src->work_dir != NULL && dst->work_dir == NULL)
 		return CNF_NOMEMORY;
-	dst->pid_file = src->pid_file == NULL ? NULL : strdup(src->pid_file);
+	if (dst->pid_file) free(dst->pid_file);dst->pid_file = src->pid_file == NULL ? NULL : strdup(src->pid_file);
 	if (src->pid_file != NULL && dst->pid_file == NULL)
 		return CNF_NOMEMORY;
-	dst->logger = src->logger == NULL ? NULL : strdup(src->logger);
+	if (dst->logger) free(dst->logger);dst->logger = src->logger == NULL ? NULL : strdup(src->logger);
 	if (src->logger != NULL && dst->logger == NULL)
 		return CNF_NOMEMORY;
 	dst->logger_nonblock = src->logger_nonblock;
 	dst->io_collect_interval = src->io_collect_interval;
 	dst->backlog = src->backlog;
 	dst->readahead = src->readahead;
-	dst->snap_dir = src->snap_dir == NULL ? NULL : strdup(src->snap_dir);
+	if (dst->snap_dir) free(dst->snap_dir);dst->snap_dir = src->snap_dir == NULL ? NULL : strdup(src->snap_dir);
 	if (src->snap_dir != NULL && dst->snap_dir == NULL)
 		return CNF_NOMEMORY;
-	dst->wal_dir = src->wal_dir == NULL ? NULL : strdup(src->wal_dir);
+	if (dst->wal_dir) free(dst->wal_dir);dst->wal_dir = src->wal_dir == NULL ? NULL : strdup(src->wal_dir);
 	if (src->wal_dir != NULL && dst->wal_dir == NULL)
 		return CNF_NOMEMORY;
 	dst->primary_port = src->primary_port;
 	dst->secondary_port = src->secondary_port;
 	dst->too_long_threshold = src->too_long_threshold;
-	dst->custom_proc_title = src->custom_proc_title == NULL ? NULL : strdup(src->custom_proc_title);
+	if (dst->custom_proc_title) free(dst->custom_proc_title);dst->custom_proc_title = src->custom_proc_title == NULL ? NULL : strdup(src->custom_proc_title);
 	if (src->custom_proc_title != NULL && dst->custom_proc_title == NULL)
 		return CNF_NOMEMORY;
 	dst->memcached_port = src->memcached_port;
@@ -1865,7 +1865,7 @@ dup_tarantool_cfg(tarantool_cfg* dst, tarantool_cfg* src) {
 	dst->wal_dir_rescan_delay = src->wal_dir_rescan_delay;
 	dst->panic_on_snap_error = src->panic_on_snap_error;
 	dst->panic_on_wal_error = src->panic_on_wal_error;
-	dst->replication_source = src->replication_source == NULL ? NULL : strdup(src->replication_source);
+	if (dst->replication_source) free(dst->replication_source);dst->replication_source = src->replication_source == NULL ? NULL : strdup(src->replication_source);
 	if (src->replication_source != NULL && dst->replication_source == NULL)
 		return CNF_NOMEMORY;
 
@@ -1889,7 +1889,7 @@ dup_tarantool_cfg(tarantool_cfg* dst, tarantool_cfg* src) {
 				while (src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index] != NULL) {
 					ARRAYALLOC(dst->namespace[i->idx_name__namespace]->index, i->idx_name__namespace__index + 1, _name__namespace__index, 0, 0);
 
-					dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type = src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type == NULL ? NULL : strdup(src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type);
+					if (dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type) free(dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type);dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type = src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type == NULL ? NULL : strdup(src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type);
 					if (src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type != NULL && dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->type == NULL)
 						return CNF_NOMEMORY;
 					dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->unique = src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->unique;
@@ -1903,7 +1903,7 @@ dup_tarantool_cfg(tarantool_cfg* dst, tarantool_cfg* src) {
 							ARRAYALLOC(dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field, i->idx_name__namespace__index__key_field + 1, _name__namespace__index__key_field, 0, 0);
 
 							dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->fieldno = src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->fieldno;
-							dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type = src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type == NULL ? NULL : strdup(src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type);
+							if (dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type) free(dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type);dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type = src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type == NULL ? NULL : strdup(src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type);
 							if (src->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type != NULL && dst->namespace[i->idx_name__namespace]->index[i->idx_name__namespace__index]->key_field[i->idx_name__namespace__index__key_field]->type == NULL)
 								return CNF_NOMEMORY;
 
diff --git a/mod/box/index.m b/mod/box/index.m
index db52f7aac6c07553d95ba71f34cac0642ba64b8d..e66626e4f4dec394ab859d74386346d54c1916b8 100644
--- a/mod/box/index.m
+++ b/mod/box/index.m
@@ -646,6 +646,7 @@ static void
 index_tree_free(struct index *index)
 {
 	(void)index;
+	/* sptree_free? */
 }
 
 void
diff --git a/test/box/valgrind.sup b/test/box/valgrind.sup
index e17fd7536e8025994b7b48012ee8ed87ab0751b5..19f3ab1b2383e04b222c2c6ad3700e4b5a5d716d 100644
--- a/test/box/valgrind.sup
+++ b/test/box/valgrind.sup
@@ -27,57 +27,19 @@
    ...
 }
 
-
-##
-## third_party
-##
-
-
 ##
 ## libev internals
 ##
 
 {
-   <libev/libc internal stuff>
+   <uninitialized value>
    Memcheck:Param
    write(buf)
    fun:__write_nocancel
    fun:evpipe_write
    fun:ev_feed_signal
    fun:ev_sighandler
-   obj:*
-   fun:__epoll_wait_nocancel
-   fun:epoll_poll
-   fun:ev_run
-   fun:ev_loop
-   fun:main
-}
-
-{
-   <0 byte free>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:ev_realloc_emul
-   fun:ev_realloc
-   fun:epoll_destroy
-   fun:ev_loop_destroy
-   fun:ev_default_destroy
-   fun:tarantool_free
-   fun:main
-}
-
-{
-   <0 byte free>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:ev_realloc_emul
-   fun:ev_realloc
-   fun:ev_loop_destroy
-   fun:ev_default_destroy
-   fun:tarantool_free
-   fun:main
+   ...
 }
 
 {
@@ -91,10 +53,7 @@
    fun:ev_loop_destroy
    fun:ev_default_destroy
    fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
-   fun:mod_init
+   ...
 }
 
 {
@@ -107,94 +66,7 @@
    fun:ev_loop_destroy
    fun:ev_default_destroy
    fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
-   fun:mod_init
-   fun:main
-}
-
-
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:ev_realloc_emul
-   fun:ev_realloc
-   fun:epoll_destroy
-   fun:ev_loop_destroy
-   fun:ev_default_destroy
-   fun:tarantool_free
-   fun:exit
-   fun:(below main)
-}
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:ev_realloc_emul
-   fun:ev_realloc
-   fun:ev_loop_destroy
-   fun:ev_default_destroy
-   fun:tarantool_free
-   fun:exit
-   fun:(below main)
-}
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:ev_realloc_emul
-   fun:ev_realloc
-   fun:epoll_destroy
-   fun:ev_loop_destroy
-   fun:ev_default_destroy
-   fun:tarantool_free
-   fun:exit
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
-}
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:ev_realloc_emul
-   fun:ev_realloc
-   fun:ev_loop_destroy
-   fun:ev_default_destroy
-   fun:tarantool_free
-   fun:exit
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
-   fun:mod_init
-}
-
-{
-   <libev uninitialized value>
-   Memcheck:Param
-   write(buf)
-   fun:__write_nocancel
-   fun:evpipe_write
-   fun:ev_feed_signal
-   fun:ev_sighandler
-   obj:/lib64/libc-2.5.so
-   fun:__write_nocancel
-   fun:vsay
-   fun:_say
-   fun:fiber_serv_socket
-   fun:acceptor_handler
-   fun:fiber_loop
-   fun:coro_init
+   ...
 }
 
 ##
@@ -206,49 +78,33 @@
    Memcheck:Leak
    fun:malloc
    fun:realloc
-   fun:kh_resize_fid2fiber
-   fun:kh_put_fid2fiber
-   fun:register_fid
-   fun:fiber_create
-   fun:spawn_child
-   fun:recover_init
-   fun:mod_init
-   fun:main
+   fun:kh_destroy_int_ptr_map
+   ...
 }
 
 {
-   <insert_a_suppression_name_here>
+   <realloc with 0 byte>
    Memcheck:Leak
    fun:malloc
    fun:realloc
    fun:tnt_xrealloc
    fun:kh_destroy_lstr_ptr_map
-   fun:index_hash_str_free
-   fun:index_free
-   fun:namespace_free
-   fun:mod_free
-   fun:exit
-   fun:(below main)
+   ...
 }
 
 {
-   <insert_a_suppression_name_here>
+   <realloc with 0 byte>
    Memcheck:Leak
    fun:malloc
    fun:realloc
-   fun:tnt_xrealloc
-   fun:kh_destroy_lstr_ptr_map
-   fun:index_hash_str_free
-   fun:index_free
-   fun:memcached_namespace_free
-   fun:namespace_free
-   fun:mod_free
-   fun:exit
-   fun:(below main)
+   fun:kh_destroy_fid2fiber
+   fun:fiber_free
+   fun:tarantool_free
+   ...
 }
 
 {
-   <insert_a_suppression_name_here>
+   <realloc with 0 byte>
    Memcheck:Leak
    fun:malloc
    fun:realloc
@@ -256,35 +112,9 @@
    fun:kh_destroy_lstr_ptr_map
    fun:index_hash_str_free
    fun:index_free
-   fun:namespace_free
-   fun:mod_free
-   fun:exit
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
+   ...
 }
 
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:tnt_xrealloc
-   fun:kh_destroy_lstr_ptr_map
-   fun:index_hash_str_free
-   fun:index_free
-   fun:memcached_namespace_free
-   fun:namespace_free
-   fun:mod_free
-   fun:exit
-   fun:blocking_loop
-   fun:spawn_child
-}
-
-
-
-
-
 {
    <realloc with 0 byte>
    Memcheck:Leak
@@ -294,12 +124,7 @@
    fun:kh_resize_lstr_ptr_map
    fun:kh_put_lstr_ptr_map
    fun:index_replace_hash_str
-   fun:prepare_replace
-   fun:box_dispatch
-   fun:box_process
-   fun:recover_row
-   fun:recover_wal
-   fun:recover_remaining_wals
+   ...
 }
 
 {
@@ -307,163 +132,21 @@
    Memcheck:Leak
    fun:malloc
    fun:realloc
-   fun:tnt_xrealloc
-   fun:kh_resize_lstr_ptr_map
-   fun:kh_put_lstr_ptr_map
-   fun:index_replace_hash_str
-   fun:prepare_replace
-   fun:box_dispatch
-   fun:box_process
-   fun:box_process_rw
-   fun:iproto_reply
-   fun:iproto_interact
-}
-
-##
-## realloc(ptr, 0) wal_writer
-##
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:tnt_xrealloc
-   fun:kh_destroy_lstr_ptr_map
-   fun:index_hash_str_free
-   fun:index_free
-   fun:namespace_free
-   fun:mod_free
-   fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
-}
-
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:tnt_xrealloc
-   fun:kh_destroy_lstr_ptr_map
-   fun:index_hash_str_free
-   fun:index_free
-   fun:namespace_free
-   fun:mod_free
-   fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
-}
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:tnt_xrealloc
-   fun:kh_destroy_lstr_ptr_map
-   fun:index_hash_str_free
-   fun:index_free
-   fun:memcached_namespace_free
-   fun:namespace_free
-   fun:mod_free
-   fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-}
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:tnt_xrealloc
-   fun:kh_destroy_lstr_ptr_map
-   fun:index_hash_str_free
-   fun:index_free
-   fun:memcached_namespace_free
-   fun:namespace_free
-   fun:mod_free
-   fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-}
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:tnt_xrealloc
-   fun:kh_destroy_lstr_ptr_map
-   fun:index_hash_str_free
-   fun:index_free
-   fun:memcached_namespace_free
-   fun:namespace_free
-   fun:mod_free
-   fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-}
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:kh_destroy_fid2fiber
-   fun:fiber_free
-   fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
-   fun:mod_init
-   fun:main
-}
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:kh_destroy_fid2fiber
-   fun:fiber_free
-   fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
-   fun:mod_init
-   fun:main
-}
-
-{
-   <insert_a_suppression_name_here>
-   Memcheck:Leak
-   fun:malloc
-   fun:realloc
-   fun:kh_destroy_fid2fiber
-   fun:fiber_free
-   fun:tarantool_free
-   fun:blocking_loop
-   fun:spawn_child
-   fun:recover_init
-   fun:mod_init
-   fun:main
+   fun:kh_resize_int_ptr_map
+   fun:kh_put_int_ptr_map
+   fun:index_replace_hash_num
+   ...
 }
 
 {
-   <insert_a_suppression_name_here>
+   <realloc with 0 byte>
    Memcheck:Leak
    fun:malloc
    fun:realloc
-   fun:kh_destroy_fid2fiber
-   fun:fiber_free
-   fun:tarantool_free
-   fun:exit
-   fun:blocking_loop
+   fun:kh_resize_fid2fiber
+   fun:kh_put_fid2fiber
+   fun:register_fid
+   fun:fiber_create
    fun:spawn_child
    fun:recover_init
    fun:mod_init
@@ -474,28 +157,21 @@
 ## backtrace
 ##
 
+## backtrace implementation is system specific and
+## produces alot of warnings.
+
 {
    <backtrace internals>
    Memcheck:Cond
    fun:backtrace
-   fun:fiber_info
-   fun:admin_dispatch
-   fun:admin_handler
-   fun:fiber_loop
-   fun:coro_init
-   obj:*
+   ...
 }
 
 {
    <backtrace internals>
    Memcheck:Value8
    fun:backtrace
-   fun:fiber_info
-   fun:admin_dispatch
-   fun:admin_handler
-   fun:fiber_loop
-   fun:coro_init
-   obj:*
+   ...
 }
 
 {
@@ -505,12 +181,7 @@
    fun:vsnprintf
    fun:snprintf
    fun:backtrace
-   fun:fiber_info
-   fun:admin_dispatch
-   fun:admin_handler
-   fun:fiber_loop
-   fun:coro_init
-   obj:*
+   ...
 }
 
 {
@@ -521,12 +192,7 @@
    fun:vsnprintf
    fun:snprintf
    fun:backtrace
-   fun:fiber_info
-   fun:admin_dispatch
-   fun:admin_handler
-   fun:fiber_loop
-   fun:coro_init
-   obj:*
+   ...
 }
 
 {
@@ -537,76 +203,15 @@
    fun:vsnprintf
    fun:snprintf
    fun:backtrace
-   fun:fiber_info
-   fun:admin_dispatch
-   fun:admin_handler
-   fun:fiber_loop
-   fun:coro_init
-   obj:*
-}
-
-{
-   <backtrace internals>
-   Memcheck:Cond
-   fun:vfprintf
-   fun:vsnprintf
-   fun:snprintf
-   fun:backtrace
-   fun:fiber_info
-   fun:admin_dispatch
-   fun:admin_handler
-   fun:fiber_loop
-   fun:coro_init
-   obj:*
-}
-
-{
-   <backtrace internals>
-   Memcheck:Cond
-   fun:vfprintf
-   fun:vsnprintf
-   fun:snprintf
-   fun:backtrace
-   fun:fiber_info
-   fun:admin_dispatch
-   fun:admin_handler
-   fun:fiber_loop
-   fun:coro_init
-   obj:*
-}
-
-{
-   <backtrace internals>
-   Memcheck:Cond
-   fun:vfprintf
-   fun:vsnprintf
-   fun:snprintf
-   fun:backtrace
-   fun:fiber_info
-   fun:admin_dispatch
-   fun:admin_handler
-   fun:fiber_loop
-   fun:coro_init
-   obj:*
-}
-
-{
-   <backtrace internals>
-   Memcheck:Value8
-   fun:backtrace
-   fun:fiber_info
-   fun:admin_dispatch
-   fun:admin_handler
-   fun:fiber_loop
-   fun:coro_init
-   obj:*
+   ...
 }
 
-
 ##
 ## box allocations
 ## 
 
+## we can't directly free tuple allocations.
+
 {
    <box>
    Memcheck:Leak
@@ -638,3 +243,64 @@
    fun:mod_init
    fun:main
 }
+
+{
+   <box>
+   Memcheck:Leak
+   fun:salloc
+   fun:tuple_alloc
+   fun:prepare_replace
+   fun:box_dispatch
+   fun:box_process
+   fun:box_process_rw
+   fun:store
+   fun:memcached_dispatch
+   fun:memcached_handler
+   ...
+}
+
+{
+   <box>
+   Memcheck:Leak
+   fun:salloc
+   fun:tuple_alloc
+   fun:prepare_replace
+   fun:box_dispatch
+   fun:box_process
+   fun:box_process_rw
+   fun:iproto_reply
+   fun:iproto_interact
+   fun:fiber_loop
+   fun:coro_init
+   obj:*
+}
+
+## sptree
+##
+
+## third_party sptree implementation doesn't have
+## destroy function.
+
+{
+   <insert_a_suppression_name_here>
+   Memcheck:Leak
+   fun:malloc
+   fun:realloc
+   fun:sptree_str_t_init
+   fun:build_indexes
+   ...
+}
+
+# iterator_init_set calls realloc only if iterator value not
+# initialized or have lower depth.
+
+{
+   <insert_a_suppression_name_here>
+   Memcheck:Leak
+   fun:malloc
+   fun:realloc
+   fun:sptree_str_t_iterator_init_set
+   fun:index_iterator_init_tree_str
+   fun:process_select
+   ...
+}