From dfb19c06b867786b5d9a9b49e7d10fc86c1d4057 Mon Sep 17 00:00:00 2001
From: mkaruza <mario.karuza@gmail.com>
Date: Tue, 14 Aug 2018 10:34:51 +0200
Subject: MDEV-15933 Cannot resume Node SYNCED state when wsrep_desync is done
 after FTWRL

Manually setting wsrep_desync after FTWRL should not be allowed.
---
 sql/wsrep_var.cc | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'sql/wsrep_var.cc')

diff --git a/sql/wsrep_var.cc b/sql/wsrep_var.cc
index 216bab0cdcd..3826ebed14c 100644
--- a/sql/wsrep_var.cc
+++ b/sql/wsrep_var.cc
@@ -587,6 +587,12 @@ bool wsrep_desync_check (sys_var *self, THD* thd, set_var* var)
     return true;
   }
 
+  if (thd->global_read_lock.is_acquired())
+  {
+    my_message (ER_CANNOT_USER, "Global read lock acquired. Can't set 'wsrep_desync'", MYF(0));
+    return true;
+  }
+
   bool new_wsrep_desync= (bool) var->save_result.ulonglong_value;
   if (wsrep_desync == new_wsrep_desync) {
     if (new_wsrep_desync) {
-- 
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