Problem

```----
MySQL abnormally exits on KILL command.

Fix
```

The abnormal exit has been fixed.

RB: 20971, 21129, 21237

sql/log_event.cc

 /*
-   Copyright (c) 2000, 2018, Oracle and/or its affiliates.
-   Copyright (c) 2009, 2018, MariaDB
+   Copyright (c) 2000, 2019, Oracle and/or its affiliates.
+   Copyright (c) 2009, 2019, MariaDB
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -48,6 +48,7 @@
 #include "transaction.h"
 #include <my_dir.h>
 #include "sql_show.h"    // append_identifier
+#include "debug_sync.h"  // debug_sync
 
 #endif /* MYSQL_CLIENT */
 
@@ -8512,25 +8513,28 @@ int Rows_log_event::do_apply_event(Relay_log_info const *rli)
     /* A small test to verify that objects have consistent types */
     DBUG_ASSERT(sizeof(thd->variables.option_bits) == sizeof(OPTION_RELAXED_UNIQUE_CHECKS));
 
+    DBUG_EXECUTE_IF("rows_log_event_before_open_table",
+                    {
+                      const char action[] = "now SIGNAL before_open_table WAIT_FOR go_ahead_sql";
+                      DBUG_ASSERT(!debug_sync_set_action(thd, STRING_WITH_LEN(action)));
+                    };);
+
     if (open_and_lock_tables(thd, rli->tables_to_lock, FALSE, 0))
     {
-      uint actual_error= thd->stmt_da->sql_errno();
-      if (thd->is_slave_error || thd->is_fatal_error)
+      if (thd->is_error())
       {
         /*
           Error reporting borrowed from Query_log_event with many excessive
-          simplifications. 
+          simplifications.
           We should not honour --slave-skip-errors at this point as we are
-          having severe errors which should not be skiped.
+          having severe errors which should not be skipped.
         */
-        rli->report(ERROR_LEVEL, actual_error,
+        rli->report(ERROR_LEVEL, thd->stmt_da->sql_errno(),
                     "Error executing row event: '%s'",
-                    (actual_error ? thd->stmt_da->message() :
-                     "unexpected success or fatal error"));
+                     thd->stmt_da->message());
         thd->is_slave_error= 1;
       }
-      const_cast<Relay_log_info*>(rli)->slave_close_thread_tables(thd);
-      DBUG_RETURN(actual_error);
+      DBUG_RETURN(1);
     }
 
     /*

sql/log_event_old.cc

-/* Copyright (c) 2007, 2018, Oracle and/or its affiliates.
-   Copyright (c) 2009, 2018, MariaDB
+/* Copyright (c) 2007, 2019, Oracle and/or its affiliates.
+   Copyright (c) 2009, 2019, MariaDB
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -100,21 +100,20 @@ Old_rows_log_event::do_apply_event(Old_rows_log_event *ev, const Relay_log_info
 
     if (open_and_lock_tables(ev_thd, rli->tables_to_lock, FALSE, 0))
     {
-      uint actual_error= ev_thd->stmt_da->sql_errno();
-      if (ev_thd->is_slave_error || ev_thd->is_fatal_error)
+      if (ev_thd->is_error())
       {
         /*
           Error reporting borrowed from Query_log_event with many excessive
-          simplifications (we don't honour --slave-skip-errors)
+          simplifications.
+          We should not honour --slave-skip-errors at this point as we are
+          having severe errors which should not be skipped.
         */
-        rli->report(ERROR_LEVEL, actual_error,
+        rli->report(ERROR_LEVEL, ev_thd->stmt_da->sql_errno(),
                     "Error '%s' on opening tables",
-                    (actual_error ? ev_thd->stmt_da->message() :
-                     "unexpected success or fatal error"));
+                    ev_thd->stmt_da->message());
         ev_thd->is_slave_error= 1;
       }
-      const_cast<Relay_log_info*>(rli)->slave_close_thread_tables(thd);
-      DBUG_RETURN(actual_error);
+      DBUG_RETURN(1);
     }
 
     /*