diff --git a/sql/xa.cc b/sql/xa.cc
index 48cbf65c53a29..eb53d11f92438 100644
--- a/sql/xa.cc
+++ b/sql/xa.cc
@@ -524,9 +524,13 @@ static bool trans_xa_get_backup_lock(THD *thd, MDL_request *mdl_request)
   DBUG_ASSERT(thd->backup_commit_lock == 0);
   MDL_REQUEST_INIT(mdl_request, MDL_key::BACKUP, "", "", MDL_BACKUP_COMMIT,
                    MDL_EXPLICIT);
-  if (thd->mdl_context.acquire_lock(mdl_request,
+  if (mdl_request &&
+      thd->mdl_context.acquire_lock(mdl_request,
                                     thd->variables.lock_wait_timeout))
+  {
+    mdl_request->~MDL_request();;
     return 1;
+  }
   thd->backup_commit_lock= mdl_request;
   return 0;
 }
@@ -536,6 +540,7 @@ static inline void trans_xa_release_backup_lock(THD *thd)
   if (thd->backup_commit_lock)
   {
     thd->mdl_context.release_lock(thd->backup_commit_lock->ticket);
+    thd->backup_commit_lock->~MDL_request();;
     thd->backup_commit_lock= 0;
   }
 }
@@ -563,11 +568,11 @@ bool trans_xa_prepare(THD *thd)
     my_error(ER_XAER_NOTA, MYF(0));
   else
   {
-    MDL_request mdl_request;
-    if (trans_xa_get_backup_lock(thd, &mdl_request) ||
+    MDL_request *mdl_request= new (thd->mem_root) MDL_request;
+    if (trans_xa_get_backup_lock(thd, mdl_request) ||
         ha_prepare(thd))
     {
-      if (!mdl_request.ticket)
+      if (!mdl_request->ticket)
         /* Failed to get the backup lock */
         ha_rollback_trans(thd, TRUE);
       thd->variables.option_bits&= ~(OPTION_BEGIN | OPTION_BINLOG_THIS_TRX);
@@ -652,7 +657,6 @@ bool trans_xa_commit(THD *thd)
     if (auto xs= xid_cache_search(thd, thd->lex->xid))
     {
       bool xid_deleted= false;
-      MDL_request mdl_request;
       bool rw_trans= (xs->rm_error != ER_XA_RBROLLBACK);
 
       if (rw_trans && thd->is_read_only_ctx())
@@ -662,7 +666,7 @@ bool trans_xa_commit(THD *thd)
         goto _end_external_xid;
       }
       res= xa_trans_rolled_back(xs);
-      if (trans_xa_get_backup_lock(thd, &mdl_request))
+      if (trans_xa_get_backup_lock(thd, new (thd->mem_root) MDL_request))
       {
         /*
           We can't rollback an XA transaction on lock failure due to
@@ -720,14 +724,13 @@ bool trans_xa_commit(THD *thd)
   else if (thd->transaction->xid_state.xid_cache_element->xa_state ==
            XA_PREPARED)
   {
-    MDL_request mdl_request;
     if (thd->lex->xa_opt != XA_NONE)
     {
       my_error(ER_XAER_INVAL, MYF(0));
       DBUG_RETURN(TRUE);
     }
 
-    if (trans_xa_get_backup_lock(thd, &mdl_request))
+    if (trans_xa_get_backup_lock(thd, new (thd->mem_root) MDL_request))
     {
       /*
         We can't rollback an XA transaction on lock failure due to
@@ -792,7 +795,6 @@ bool trans_xa_commit(THD *thd)
 bool trans_xa_rollback(THD *thd)
 {
   XID_STATE &xid_state= thd->transaction->xid_state;
-  MDL_request mdl_request;
   bool error;
   DBUG_ENTER("trans_xa_rollback");
 
@@ -823,7 +825,7 @@ bool trans_xa_rollback(THD *thd)
         goto _end_external_xid;
       }
 
-      if (trans_xa_get_backup_lock(thd, &mdl_request))
+      if (trans_xa_get_backup_lock(thd, new (thd->mem_root) MDL_request))
       {
         /*
           We can't rollback an XA transaction on lock failure due to
@@ -867,7 +869,7 @@ bool trans_xa_rollback(THD *thd)
     DBUG_RETURN(TRUE);
   }
 
-  if (trans_xa_get_backup_lock(thd, &mdl_request))
+  if (trans_xa_get_backup_lock(thd, new (thd->mem_root) MDL_request))
   {
     /*
       We can't rollback an XA transaction on lock failure due to