Assertion `b' failed in my_strnncoll_xxxx_nopad_ci

--source include/have_innodb.inc

SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;

CREATE TABLE t (x TEXT, UNIQUE(x)) ENGINE=InnoDB

  CHARACTER SET utf8mb3 COLLATE utf8mb3_general_nopad_ci 

    SELECT '' AS x;

DROP TABLE t;

mariadbd: /data/bld/testing/bb-11.8-release/strings/strcoll.inl:231: my_strnncoll_utf8mb3_general_nopad_ci: Assertion `b' failed.

260510 22:58:50 [ERROR] /share8t/bld/testing/bb-11.8-release/sql/mariadbd got signal 6 ;

#9  0x00007fb77e853eb2 in __GI___assert_fail (assertion=0x5627fedb1940 "b", file=0x5627fedb1908 "/data/bld/testing/bb-11.8-release/strings/strcoll.inl", line=231, function=0x5627fedb5a60 <__PRETTY_FUNCTION__.46> "my_strnncoll_utf8mb3_general_nopad_ci") at ./assert/assert.c:101

#10 0x00005627fe57ba0f in my_strnncoll_utf8mb3_general_nopad_ci (cs=0x5627ff5018a0 <my_charset_utf8mb3_general_nopad_ci>, a=0x77b7441d7920 "", a_length=0, b=0x0, b_length=0, b_is_prefix=0 '\000') at /data/bld/testing/bb-11.8-release/strings/strcoll.inl:231

#11 0x00005627fe57bc20 in my_strnncollsp_utf8mb3_general_nopad_ci (cs=0x5627ff5018a0 <my_charset_utf8mb3_general_nopad_ci>, a=0x77b7441d7920 "", a_length=0, b=0x0, b_length=0) at /data/bld/testing/bb-11.8-release/strings/strcoll.inl:312

#12 0x00005627fdb07970 in charset_info_st::strnncollsp (this=0x5627ff5018a0 <my_charset_utf8mb3_general_nopad_ci>, a=0x77b7441d7920 "", alen=0, b=0x0, blen=0) at /data/bld/testing/bb-11.8-release/include/m_ctype.h:1127

#13 0x00005627fdafd801 in Field_blob::cmp (this=0x77b7441c29c0, a=0x77b7441d7920 "", a_length=0, b=0x0, b_length=0) at /data/bld/testing/bb-11.8-release/sql/field.cc:9086

#14 0x00005627fdafd8a6 in Field_blob::cmp (this=0x77b7441c29c0, a_ptr=0x77b7441c28e1 "", b_ptr=0x77b7441c2f99 "") at /data/bld/testing/bb-11.8-release/sql/field.cc:9096

#15 0x00005627fd8c7674 in Field::cmp_offset (this=0x77b7441c29c0, row_offset=1720) at /data/bld/testing/bb-11.8-release/sql/field.h:1354

#16 0x00005627fdb3a47c in long_unique_fields_differ (keyinfo=0x77b7441c2bb0, other=0x77b7441c2f98 "\374") at /data/bld/testing/bb-11.8-release/sql/handler.cc:7896

#17 0x00005627fdb3a864 in handler::check_duplicate_long_entry_key (this=0x77b7441c2088, new_rec=0x77b7441c28e0 "\374", key_no=0) at /data/bld/testing/bb-11.8-release/sql/handler.cc:7948

#18 0x00005627fdb3ae0e in handler::ha_check_long_uniques (this=0x77b7441c2088, old_rec=0x0, new_rec=0x77b7441c28e0 "\374") at /data/bld/testing/bb-11.8-release/sql/handler.cc:8019

#19 0x00005627fdb3ab3e in handler::ha_check_inserver_constraints (this=0x77b7441c2088, old_data=0x0, new_data=0x77b7441c28e0 "\374") at /data/bld/testing/bb-11.8-release/sql/handler.cc:7993

#20 0x00005627fdb3c21b in handler::ha_write_row (this=0x77b7441c2088, buf=0x77b7441c28e0 "\374") at /data/bld/testing/bb-11.8-release/sql/handler.cc:8275

#21 0x00005627fd6878b9 in Write_record::single_insert (this=0x7fb7704ec5d0, inserted=0x7fb7704ebf20) at /data/bld/testing/bb-11.8-release/sql/sql_insert.cc:2370

#22 0x00005627fd687a8c in Write_record::write_record (this=0x7fb7704ec5d0) at /data/bld/testing/bb-11.8-release/sql/sql_insert.cc:2412

#23 0x00005627fd68daee in select_insert::send_data (this=0x77b744019bd0, values=...) at /data/bld/testing/bb-11.8-release/sql/sql_insert.cc:4503

#24 0x00005627fd7afc55 in select_result_sink::send_data_with_check (this=0x77b744019bd0, items=..., u=0x77b744005318, sent=0) at /data/bld/testing/bb-11.8-release/sql/sql_class.h:6368

#25 0x00005627fd7574b2 in JOIN::exec_inner (this=0x77b744019d18) at /data/bld/testing/bb-11.8-release/sql/sql_select.cc:4983

#26 0x00005627fd756d82 in JOIN::exec (this=0x77b744019d18) at /data/bld/testing/bb-11.8-release/sql/sql_select.cc:4900

#27 0x00005627fd75872f in mysql_select (thd=0x77b744000dc8, tables=0x0, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2201187781376, result=0x77b744019bd0, unit=0x77b744005318, select_lex=0x77b744018a20) at /data/bld/testing/bb-11.8-release/sql/sql_select.cc:5426

#28 0x00005627fd7463c0 in handle_select (thd=0x77b744000dc8, lex=0x77b744005238, result=0x77b744019bd0, setup_tables_done_option=0) at /data/bld/testing/bb-11.8-release/sql/sql_select.cc:634

#29 0x00005627fd834ce6 in Sql_cmd_create_table_like::execute (this=0x77b744018058, thd=0x77b744000dc8) at /data/bld/testing/bb-11.8-release/sql/sql_table.cc:13743

#30 0x00005627fd6e5d76 in mysql_execute_command (thd=0x77b744000dc8, is_called_from_prepared_stmt=false) at /data/bld/testing/bb-11.8-release/sql/sql_parse.cc:5924

#31 0x00005627fd6ec0b1 in mysql_parse (thd=0x77b744000dc8, rawbuf=0x77b744017f10 "CREATE TABLE t (x TEXT, UNIQUE(x)) ENGINE=InnoDB\nCHARACTER SET utf8mb3 COLLATE utf8mb3_general_nopad_ci \nSELECT '' AS x", length=119, parser_state=0x7fb7704ed2d0) at /data/bld/testing/bb-11.8-release/sql/sql_parse.cc:7953

#32 0x00005627fd6d8153 in dispatch_command (command=COM_QUERY, thd=0x77b744000dc8, packet=0x77b74400be69 "CREATE TABLE t (x TEXT, UNIQUE(x)) ENGINE=InnoDB\nCHARACTER SET utf8mb3 COLLATE utf8mb3_general_nopad_ci \nSELECT '' AS x", packet_length=119, blocking=true) at /data/bld/testing/bb-11.8-release/sql/sql_parse.cc:1923

#33 0x00005627fd6d6a72 in do_command (thd=0x77b744000dc8, blocking=true) at /data/bld/testing/bb-11.8-release/sql/sql_parse.cc:1431

#34 0x00005627fd8e9e6d in do_handle_one_connection (connect=0x562838afa118, put_in_cache=true) at /data/bld/testing/bb-11.8-release/sql/sql_connect.cc:1504

#35 0x00005627fd8e9bee in handle_one_connection (arg=0x562838af88b8) at /data/bld/testing/bb-11.8-release/sql/sql_connect.cc:1416

#36 0x00005627fde79f58 in pfs_spawn_thread (arg=0x562838af9c88) at /data/bld/testing/bb-11.8-release/storage/perfschema/pfs.cc:2198

#37 0x00007fb77e8a81c4 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

#38 0x00007fb77e92885c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

commit 7c1b02cc19883708b6111f50f8d2cd2d2c371f5c

Author: Raghunandan Bhat

Date:   Mon Apr 13 16:45:39 2026 +0530

    MDEV-35717: UBSAN: runtime error: applying zero offset to