ASAN unknown-crash / READ of size 1 in my_strntoul_8bit upon INSERT .. SELECT

CREATE TABLE t1 (a CHAR);

CREATE TABLE t2 (b ENUM('foo','bar'));

INSERT INTO t1 VALUES ('1');

INSERT INTO t2 SELECT * FROM t1;

# Cleanup

DROP TABLE t1, t2;

=================================================================

==26245==ERROR: AddressSanitizer: unknown-crash on address 0x6190000bdc0a at pc 0x1925212 bp 0x7f8af27195c0 sp 0x7f8af27195b8

READ of size 1 at 0x6190000bdc0a thread T5

    #0 0x1925211 in my_strntoul_8bit /data/src/10.0/strings/ctype-simple.c:492

    #1 0xb37db9 in Field_enum::store(char const*, unsigned int, charset_info_st const*) /data/src/10.0/sql/field.cc:8013

    #2 0xb5671a in field_conv_incompatible(Field*, Field*) /data/src/10.0/sql/field_conv.cc:948

    #3 0xb56a20 in field_conv(Field*, Field*) /data/src/10.0/sql/field_conv.cc:875

    #4 0xb9cec6 in save_field_in_field /data/src/10.0/sql/item.cc:5877

    #5 0xb9cfcd in Item_field::save_in_field(Field*, bool) /data/src/10.0/sql/item.cc:5933

    #6 0x5fdb4f in fill_record(THD*, TABLE*, Field**, List<Item>&, bool, bool) /data/src/10.0/sql/sql_base.cc:8967

    #7 0x5fdea4 in fill_record_n_invoke_before_triggers(THD*, TABLE*, Field**, List<Item>&, bool, trg_event_type) /data/src/10.0/sql/sql_base.cc:9014

    #8 0x672ce5 in select_insert::store_values(List<Item>&) /data/src/10.0/sql/sql_insert.cc:3688

    #9 0x67b69f in select_insert::send_data(List<Item>&) /data/src/10.0/sql/sql_insert.cc:3622

    #10 0x7a58c8 in end_send /data/src/10.0/sql/sql_select.cc:19123

    #11 0x79bd99 in do_select /data/src/10.0/sql/sql_select.cc:17615

    #12 0x7df26d in JOIN::exec_inner() /data/src/10.0/sql/sql_select.cc:3123

    #13 0x7e0615 in JOIN::exec() /data/src/10.0/sql/sql_select.cc:2409

    #14 0x7d5778 in mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) /data/src/10.0/sql/sql_select.cc:3348

    #15 0x7d5da8 in handle_select(THD*, LEX*, select_result*, unsigned long) /data/src/10.0/sql/sql_select.cc:377

    #16 0x6d7896 in mysql_execute_command(THD*) /data/src/10.0/sql/sql_parse.cc:3543

    #17 0x6e4990 in mysql_parse(THD*, char*, unsigned int, Parser_state*) /data/src/10.0/sql/sql_parse.cc:6637

    #18 0x6e85af in dispatch_command(enum_server_command, THD*, char*, unsigned int) /data/src/10.0/sql/sql_parse.cc:1300

    #19 0x6ecea8 in do_command(THD*) /data/src/10.0/sql/sql_parse.cc:1003

    #20 0x97cad3 in do_handle_one_connection(THD*) /data/src/10.0/sql/sql_connect.cc:1377

    #21 0x97cd3a in handle_one_connection /data/src/10.0/sql/sql_connect.cc:1292

    #22 0x11b5b34 in pfs_spawn_thread /data/src/10.0/storage/perfschema/pfs.cc:1861

    #23 0x7f8afcd2e493 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x7493)

    #24 0x7f8afb0e793e in __clone (/lib/x86_64-linux-gnu/libc.so.6+0xe893e)

0x6190000bdc0a is located 138 bytes inside of 1100-byte region [0x6190000bdb80,0x6190000bdfcc)

allocated by thread T5 here:

    #0 0x7f8afcf9873f in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x5473f)

    #1 0x18f532f in sf_malloc /data/src/10.0/mysys/safemalloc.c:115

    #2 0x19d808a (/data/bld/10.0-asan/bin/mysqld+0x19d808a)

Thread T5 created by T0 here:

    #0 0x7f8afcf67bba in pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x23bba)

    #1 0x11c138b in spawn_thread_v1 /data/src/10.0/storage/perfschema/pfs.cc:1911

SUMMARY: AddressSanitizer: unknown-crash /data/src/10.0/strings/ctype-simple.c:492 my_strntoul_8bit

Shadow bytes around the buggy address:

  0x0c328000fb30: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c328000fb40: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd

  0x0c328000fb50: fd fd fd fd fd fd fd fd fd fd fa fa fa fa fa fa

  0x0c328000fb60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa

  0x0c328000fb70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

=>0x0c328000fb80: 00[02]02 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c328000fb90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

  0x0c328000fba0: 00 00 00 00 00 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c328000fbb0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c328000fbc0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

  0x0c328000fbd0: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7

Shadow byte legend (one shadow byte represents 8 application bytes):

  Addressable:           00

  Partially addressable: 01 02 03 04 05 06 07 

  Heap left redzone:       fa

  Heap right redzone:      fb

  Freed heap region:       fd

  Stack left redzone:      f1

  Stack mid redzone:       f2

  Stack right redzone:     f3

  Stack partial redzone:   f4

  Stack after return:      f5

  Stack use after scope:   f8

  Global redzone:          f9

  Global init order:       f6

  Poisoned by user:        f7

  Contiguous container OOB:fc

  ASan internal:           fe

==26245==ABORTING