From b35789774575cc0f5dfef29f5a457ee51ce15f39 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Fri, 23 Aug 2019 17:47:38 +0300
Subject: [PATCH] mdbx: backport - fix reclaiming_detent() for out-of-txn case.

Change-Id: I5275f4f3676b125e860f6a7c204a5f9cdc65dd5f
---
 src/mdbx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mdbx.c b/src/mdbx.c
index 405a80f6..6b9601f2 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -1875,7 +1875,9 @@ static __hot MDBX_meta *mdbx_meta_head(const MDBX_env *env) {
 
 static __hot txnid_t mdbx_reclaiming_detent(const MDBX_env *env) {
   if (F_ISSET(env->me_flags, MDBX_UTTERLY_NOSYNC))
-    return env->me_txn->mt_txnid - 1;
+    return likely(env->me_txn0->mt_owner == mdbx_thread_self())
+               ? env->me_txn0->mt_txnid - 1
+               : mdbx_meta_txnid_fluid(env, mdbx_meta_head(env));
 
   return mdbx_meta_txnid_stable(env, mdbx_meta_steady(env));
 }