Bug #11747102 30771: LOG MORE INFO ABOUT THREADS KILL'D AND SORT ABORTED MESSAGES

mysql-test/r/filesort_debug.result:
  New test case.
mysql-test/t/filesort_debug.test:
  New test case.
sql/filesort.cc:
  thd->killed does not imply thd->is_error(), so test for that separately.

mysql-test/r/filesort_debug.result

@@ -14,3 +14,20 @@ DELETE FROM t1 ORDER BY (f1(10)) LIMIT 1;
 ERROR 42000: Incorrect number of arguments for FUNCTION test.f1; expected 0, got 1
 DROP TABLE t1;
 DROP FUNCTION f1;
+#
+# Bug #11747102
+# 30771: LOG MORE INFO ABOUT THREADS KILL'D AND SORT ABORTED MESSAGES
+#
+# connection 1
+CREATE TABLE t1(f0 int auto_increment primary key, f1 int);
+INSERT INTO t1(f1) VALUES (0),(1),(2),(3),(4),(5);
+SET DEBUG_SYNC='filesort_start SIGNAL filesort_started WAIT_FOR filesort_killed';
+# Sending: (not reaped since connection is killed later)
+SELECT * FROM t1 ORDER BY f1 ASC, f0;
+# connection 2
+SET DEBUG_SYNC='now WAIT_FOR filesort_started';
+KILL @id;
+SET DEBUG_SYNC='now SIGNAL filesort_killed';
+# connection default
+SET DEBUG_SYNC= "RESET";
+DROP TABLE t1;

mysql-test/t/filesort_debug.test

 --source include/have_debug.inc
+--source include/have_debug_sync.inc
+--source include/count_sessions.inc
 
 SET @old_debug= @@session.debug;
 
@@ -21,3 +23,37 @@ DELETE FROM t1 ORDER BY (f1(10)) LIMIT 1;
 
 DROP TABLE t1;
 DROP FUNCTION f1;
+
+--echo #
+--echo # Bug #11747102
+--echo # 30771: LOG MORE INFO ABOUT THREADS KILL'D AND SORT ABORTED MESSAGES
+--echo #
+
+connect (con1, localhost, root);
+connect (con2, localhost, root);
+
+--echo # connection 1
+connection con1;
+CREATE TABLE t1(f0 int auto_increment primary key, f1 int);
+INSERT INTO t1(f1) VALUES (0),(1),(2),(3),(4),(5);
+
+let $ID= `SELECT @id := CONNECTION_ID()`;
+
+SET DEBUG_SYNC='filesort_start SIGNAL filesort_started WAIT_FOR filesort_killed';
+--echo # Sending: (not reaped since connection is killed later)
+--send SELECT * FROM t1 ORDER BY f1 ASC, f0
+
+--echo # connection 2
+connection con2;
+let $ignore= `SELECT @id := $ID`;
+SET DEBUG_SYNC='now WAIT_FOR filesort_started';
+KILL @id;
+SET DEBUG_SYNC='now SIGNAL filesort_killed';
+
+--echo # connection default
+connection default;
+disconnect con1;
+disconnect con2;
+--source include/wait_until_count_sessions.inc
+SET DEBUG_SYNC= "RESET";
+DROP TABLE t1;

sql/filesort.cc

@@ -32,6 +32,7 @@
 #include "probes_mysql.h"
 #include "sql_test.h"                           // TEST_filesort
 #include "opt_range.h"                          // SQL_SELECT
+#include "debug_sync.h"
 
 /// How to write record_ref.
 #define WRITE_REF(file,from) \
@@ -123,6 +124,7 @@ ha_rows filesort(THD *thd, TABLE *table, SORT_FIELD *sortorder, uint s_length,
   Item_subselect *subselect= tab ? tab->containing_subselect() : 0;
 
   MYSQL_FILESORT_START(table->s->db.str, table->s->table_name.str);
+  DEBUG_SYNC(thd, "filesort_start");
 
   /*
    Release InnoDB's adaptive hash index latch (if holding) before
@@ -325,12 +327,13 @@ ha_rows filesort(THD *thd, TABLE *table, SORT_FIELD *sortorder, uint s_length,
   }
   if (error)
   {
-    DBUG_ASSERT(thd->is_error());
+    int kill_errno= thd->killed_errno();
+    DBUG_ASSERT(thd->is_error() || kill_errno);
     my_printf_error(ER_FILSORT_ABORT,
                     "%s: %s",
                     MYF(ME_ERROR + ME_WAITTANG),
                     ER_THD(thd, ER_FILSORT_ABORT),
-                    thd->stmt_da->message());
+                    kill_errno ? ER(kill_errno) : thd->stmt_da->message());
                     
     if (global_system_variables.log_warnings > 1)
     {