default.diff

diff --git a/modules/gmysqlbackend/smysql.cc b/modules/gmysqlbackend/smysql.cc
index ce0e4196f..035c587dc 100644
--- a/modules/gmysqlbackend/smysql.cc
+++ b/modules/gmysqlbackend/smysql.cc
@@ -32,21 +32,32 @@
 #include "pdns/namespaces.hh"
 #include "pdns/lock.hh"
 
+#include <sys/types.h>
+
 #if MYSQL_VERSION_ID >= 80000 && !defined(MARIADB_BASE_VERSION)
 // Need to keep this for compatibility with MySQL < 8.0.0, which used typedef char my_bool;
 // MariaDB up to 10.4 also always define it.
 typedef bool my_bool;
 #endif
 
+static int threadid(void) {
+  return pthread_self();
+}
+
 class MySQLThreadCloser
 {
 public:
   ~MySQLThreadCloser() {
+    ostringstream s;
+    s<<threadid()<<" ~MySQLThreadCloser closing ... ";
     if(d_enabled) {
+      s<<" mysql_thread_end()";
       mysql_thread_end();
     }
+    s<<endl;
+    cerr<<s.str();
   }
-  void enable() { d_enabled = true; }
+  void enable() { cerr<<threadid()<<" MySQLThreadCloser enabled"<<endl; d_enabled = true; }
 
 private:
   bool d_enabled = false;
@@ -488,6 +499,10 @@ SMySQL::SMySQL(const string &database, const string &host, uint16_t port, const
                const string &password, const string &group, bool setIsolation, unsigned int timeout):
   d_database(database), d_host(host), d_msocket(msocket), d_user(user), d_password(password), d_group(group), d_timeout(timeout), d_port(port), d_setIsolation(setIsolation)
 {
+  ostringstream s;
+
+  s<<threadid()<<" SMySQL"<<endl;
+  cerr<<s.str();
   connect();
 }
 
@@ -498,6 +513,9 @@ void SMySQL::setLog(bool state)
 
 SMySQL::~SMySQL()
 {
+  ostringstream s;
+  s<<threadid()<<" ~SMySQL"<<endl;
+  cerr<<s.str();
   mysql_close(&d_db);
 }