Mempool expects aligned object size. Because it uses the free
blocks to store metadata in them, in a struct mslab. Which needs
alignment.

Part of https://github.com/tarantool/tarantool/issues/5063
---
Branch: http://github.com/tarantool/small/tree/gerold103/tarantool/gh-5063-not-aligned-test
Issue: https://github.com/tarantool/tarantool/issues/5063

 test/mempool.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/test/mempool.c b/test/mempool.c
index 298ba17..65eabaf 100644
--- a/test/mempool.c
+++ b/test/mempool.c
@@ -1,3 +1,4 @@
+#include "trivia/util.h"
 #include <small/mempool.h>
 #include <small/quota.h>
 #include <stdio.h>
@@ -121,6 +122,12 @@ int main()
  objsize = rand() % OBJSIZE_MAX;
  if (objsize < OBJSIZE_MIN)
  objsize = OBJSIZE_MIN;
+ /*
+ * Mempool does not work with not aligned sizes. Because
+ * it utilizes the unused blocks for storing internal
+ * info, which needs alignment.
+ */
+ objsize = small_align(objsize, alignof(uint64_t));
 
  quota_init(&quota, UINT_MAX);
 
--
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