diff --git a/mysql-test/r/trigger.result b/mysql-test/r/trigger.result
index c9a91758336..711399418ac 100644
--- a/mysql-test/r/trigger.result
+++ b/mysql-test/r/trigger.result
@@ -2,6 +2,7 @@ drop table if exists t1, t2, t3, t4;
 drop view if exists v1;
 drop database if exists mysqltest;
 drop function if exists f1;
+drop function if exists f2;
 drop procedure if exists p1;
 create table t1 (i int);
 create trigger trg before insert on t1 for each row set @a:=1;
@@ -897,3 +898,26 @@ create trigger t1_bi before insert on t1 for each row return 0;
 ERROR 42000: RETURN is only allowed in a FUNCTION
 insert into t1 values (1);
 drop table t1;
+create table t1 (a varchar(64), b int);
+create table t2 like t1;
+create trigger t1_ai after insert on t1 for each row
+set @a:= (select max(a) from t1);
+insert into t1 (a) values
+("Twas"),("brillig"),("and"),("the"),("slithy"),("toves"),
+("Did"),("gyre"),("and"),("gimble"),("in"),("the"),("wabe");
+create trigger t2_ai after insert on t2 for each row
+set @a:= (select max(a) from t2);
+insert into t2 select * from t1;
+load data infile '../std_data_ln/words.dat' into table t1 (a);
+drop trigger t1_ai;
+drop trigger t2_ai;
+create function f1() returns int return (select max(b) from t1);
+insert into t1 values
+("All",f1()),("mimsy",f1()),("were",f1()),("the",f1()),("borogoves",f1()),
+("And",f1()),("the",f1()),("mome", f1()),("raths",f1()),("outgrabe",f1());
+create function f2() returns int return (select max(b) from t2);
+insert into t2 select a, f2() from t1;
+load data infile '../std_data_ln/words.dat' into table t1 (a) set b:= f1();
+drop table t1;
+drop function f1;
+drop function f2;
diff --git a/mysql-test/t/trigger.test b/mysql-test/t/trigger.test
index 1d68b519f1d..d8e2bd7c1cb 100644
--- a/mysql-test/t/trigger.test
+++ b/mysql-test/t/trigger.test
@@ -7,6 +7,7 @@ drop table if exists t1, t2, t3, t4;
 drop view if exists v1;
 drop database if exists mysqltest;
 drop function if exists f1;
+drop function if exists f2;
 drop procedure if exists p1;
 --enable_warnings
 
@@ -1057,3 +1058,36 @@ create table t1 (i int);
 create trigger t1_bi before insert on t1 for each row return 0;
 insert into t1 values (1);
 drop table t1;
+
+# Test for bug #17764 "Trigger crashes MyISAM table"
+#
+# Table was reported as crashed when it was subject table of trigger invoked
+# by insert statement which was executed with enabled bulk insert mode (which
+# is actually set of optimizations enabled by handler::start_bulk_insert())
+# and this trigger also explicitly referenced it.
+# The same problem arose when table to which bulk insert was done was also
+# referenced in function called by insert statement.
+create table t1 (a varchar(64), b int);
+create table t2 like t1;
+create trigger t1_ai after insert on t1 for each row
+  set @a:= (select max(a) from t1);
+insert into t1 (a) values
+  ("Twas"),("brillig"),("and"),("the"),("slithy"),("toves"),
+  ("Did"),("gyre"),("and"),("gimble"),("in"),("the"),("wabe");
+create trigger t2_ai after insert on t2 for each row
+  set @a:= (select max(a) from t2);
+insert into t2 select * from t1;
+load data infile '../std_data_ln/words.dat' into table t1 (a);
+drop trigger t1_ai;
+drop trigger t2_ai;
+# Test that the problem for functions is fixed as well
+create function f1() returns int return (select max(b) from t1);
+insert into t1 values
+  ("All",f1()),("mimsy",f1()),("were",f1()),("the",f1()),("borogoves",f1()),
+  ("And",f1()),("the",f1()),("mome", f1()),("raths",f1()),("outgrabe",f1());
+create function f2() returns int return (select max(b) from t2);
+insert into t2 select a, f2() from t1;
+load data infile '../std_data_ln/words.dat' into table t1 (a) set b:= f1();
+drop table t1;
+drop function f1;
+drop function f2;
diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc
index eb74144c1ea..6383e87a1c8 100644
--- a/sql/sql_insert.cc
+++ b/sql/sql_insert.cc
@@ -404,11 +404,15 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
     let's *try* to start bulk inserts. It won't necessary
     start them as values_list.elements should be greater than
     some - handler dependent - threshold.
+    We should not start bulk inserts if this statement uses
+    functions or invokes triggers since they may access
+    to the same table and therefore should not see its
+    inconsistent state created by this optimization.
     So we call start_bulk_insert to perform nesessary checks on
     values_list.elements, and - if nothing else - to initialize
     the code to make the call of end_bulk_insert() below safe.
   */
-  if (lock_type != TL_WRITE_DELAYED)
+  if (lock_type != TL_WRITE_DELAYED && !thd->prelocked_mode)
     table->file->start_bulk_insert(values_list.elements);
 
   thd->no_trans_update= 0;
@@ -534,7 +538,7 @@ bool mysql_insert(THD *thd,TABLE_LIST *table_list,
   else
 #endif
   {
-    if (table->file->end_bulk_insert() && !error)
+    if (!thd->prelocked_mode && table->file->end_bulk_insert() && !error)
     {
       table->file->print_error(my_errno,MYF(0));
       error=1;
@@ -2181,7 +2185,7 @@ select_insert::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
     lex->current_select->options|= OPTION_BUFFER_RESULT;
     lex->current_select->join->select_options|= OPTION_BUFFER_RESULT;
   }
-  else
+  else if (!thd->prelocked_mode)
   {
     /*
       We must not yet prepare the result table if it is the same as one of the 
@@ -2189,6 +2193,8 @@ select_insert::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
       indexes on the result table, which may be used during the select, if it
       is the same table (Bug #6034). Do the preparation after the select phase
       in select_insert::prepare2().
+      We won't start bulk inserts at all if this statement uses functions or
+      should invoke triggers since they may access to the same table too.
     */
     table->file->start_bulk_insert((ha_rows) 0);
   }
@@ -2229,7 +2235,8 @@ select_insert::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
 int select_insert::prepare2(void)
 {
   DBUG_ENTER("select_insert::prepare2");
-  if (thd->lex->current_select->options & OPTION_BUFFER_RESULT)
+  if (thd->lex->current_select->options & OPTION_BUFFER_RESULT &&
+      !thd->prelocked_mode)
     table->file->start_bulk_insert((ha_rows) 0);
   DBUG_RETURN(0);
 }
@@ -2332,7 +2339,8 @@ void select_insert::send_error(uint errcode,const char *err)
     */
     DBUG_VOID_RETURN;
   }
-  table->file->end_bulk_insert();
+  if (!thd->prelocked_mode)
+    table->file->end_bulk_insert();
   /*
     If at least one row has been inserted/modified and will stay in the table
     (the table doesn't have transactions) (example: we got a duplicate key
@@ -2367,7 +2375,7 @@ bool select_insert::send_eof()
   int error,error2;
   DBUG_ENTER("select_insert::send_eof");
 
-  error=table->file->end_bulk_insert();
+  error= (!thd->prelocked_mode) ? table->file->end_bulk_insert():0;
   table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
 
   /*
@@ -2450,7 +2458,8 @@ select_create::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
   thd->cuted_fields=0;
   if (info.ignore || info.handle_duplicates != DUP_ERROR)
     table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
-  table->file->start_bulk_insert((ha_rows) 0);
+  if (!thd->prelocked_mode)
+    table->file->start_bulk_insert((ha_rows) 0);
   thd->no_trans_update= 0;
   thd->abort_on_warning= (!info.ignore &&
                           (thd->variables.sql_mode &
diff --git a/sql/sql_load.cc b/sql/sql_load.cc
index cc724c102a4..0a667c887ef 100644
--- a/sql/sql_load.cc
+++ b/sql/sql_load.cc
@@ -356,7 +356,8 @@ bool mysql_load(THD *thd,sql_exchange *ex,TABLE_LIST *table_list,
     if (ignore ||
 	handle_duplicates == DUP_REPLACE)
       table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
-    table->file->start_bulk_insert((ha_rows) 0);
+    if (!thd->prelocked_mode)
+      table->file->start_bulk_insert((ha_rows) 0);
     table->copy_blobs=1;
 
     thd->no_trans_update= 0;
@@ -373,7 +374,7 @@ bool mysql_load(THD *thd,sql_exchange *ex,TABLE_LIST *table_list,
       error= read_sep_field(thd, info, table_list, fields_vars,
                             set_fields, set_values, read_info,
 			    *enclosed, skip_lines, ignore);
-    if (table->file->end_bulk_insert() && !error)
+    if (!thd->prelocked_mode && table->file->end_bulk_insert() && !error)
     {
       table->file->print_error(my_errno, MYF(0));
       error= 1;