From b30ccbde9e5210b68a6ba0570a8716f59655d010 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Sat, 25 Dec 2021 15:25:25 +0300
Subject: [PATCH] mdbx: don't reserve/backlog free-pages if retired-list was
 already put into gc.

---
 src/core.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/core.c b/src/core.c
index 766bd2c7..a552d2aa 100644
--- a/src/core.c
+++ b/src/core.c
@@ -8768,10 +8768,12 @@ retry_noaccount:
     goto bailout;
   }
 
-  rc = mdbx_prep_backlog(txn, &couple.outer,
-                         MDBX_PNL_SIZEOF(txn->tw.retired_pages));
-  if (unlikely(rc != MDBX_SUCCESS))
-    goto bailout;
+  if (retired_stored < MDBX_PNL_SIZE(txn->tw.retired_pages)) {
+    rc = mdbx_prep_backlog(txn, &couple.outer,
+                           MDBX_PNL_SIZEOF(txn->tw.retired_pages));
+    if (unlikely(rc != MDBX_SUCCESS))
+      goto bailout;
+  }
 
   unsigned settled = 0, cleaned_gc_slot = 0, reused_gc_slot = 0,
            filled_gc_slot = ~0u;