From 4899b155e3ba4acd8e5d156a1ac2fe49a208d15f Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Sun, 9 Nov 2025 10:18:07 +0300
Subject: [PATCH] mdbx: fix tls-dtor in case library unloading with an
 incomplete initialized env instance (backport).

---
 src/tls.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/tls.c b/src/tls.c
index 9d8fab2f..b2915e40 100644
--- a/src/tls.c
+++ b/src/tls.c
@@ -513,7 +513,9 @@ __cold void rthc_dtor(const uint32_t current_pid) {
     MDBX_env *const env = rthc_table[i].env;
     if (env->pid != current_pid)
       continue;
-    if (!(env->flags & ENV_TXKEY))
+    if (!env->lck_mmap.lck || env->lck_mmap.base == MAP_FAILED)
+      continue;
+    if (!(env->flags & ENV_TXKEY) || !env->lck_mmap.lck)
       continue;
     env->flags -= ENV_TXKEY;
     reader_slot_t *const begin = &env->lck_mmap.lck->rdt[0];