ASAN unknown-crash in Field_varstring::reset when inserting NULL value to a table with filename charset

SET sql_mode='';

CREATE TABLE t (a CHAR(205)) ENGINE=MYISAM CHARACTER SET filename;

INSERT INTO t VALUES (NULL);

Core was generated by `/test/UBASAN_MD171024-mariadb-11.7.0-linux-x86_64-opt/bin/mariadbd --no-default'.

Program terminated with signal SIGABRT, Aborted.

#0  __pthread_kill (threadid=<optimized out>, signo=6)at ../sysdeps/unix/sysv/linux/pthread_kill.c:56

[Current thread is 1 (Thread 0x150e92cfb700 (LWP 2151375))]

(gdb) bt

#0  __pthread_kill (threadid=<optimized out>, signo=6) at ../sysdeps/unix/sysv/linux/pthread_kill.c:56

#1  0x00000000015a1356 in handle_fatal_signal (sig=<optimized out>) at signal_handler.cc:366

#2  <signal handler called>

#3  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50

#4  0x0000150eb5c7a859 in __GI_abort () at abort.c:79

#5  0x000000000080ef37 in __sanitizer::Abort() () at sql_basic_types.h:151

#6  0x000000000080d961 in __sanitizer::Die() () at sql_basic_types.h:151

#7  0x00000000007f5299 in __asan::ScopedInErrorReport::~ScopedInErrorReport() () at sql_basic_types.h:151

#8  0x00000000007f6d4e in __asan::ReportGenericError(unsigned long, unsigned long, unsigned long, unsigned long, bool, unsigned long, unsigned int, bool) () at sql_basic_types.h:151

#9  0x00000000007f0a81 in __asan_memset () at sql_basic_types.h:151

#10 0x000000000157533c in Field_varstring::reset (this=<optimized out>) at field.h:4235

#11 0x000000000157b268 in set_field_to_null_with_conversions (field=<optimized out>, no_conversions=<optimized out>) at field_conv.cc:213

#12 0x0000000000a6910a in fill_record (thd=<optimized out>, table=<optimized out>, ptr=<optimized out>, values=<optimized out>, ignore_errors=<optimized out>, use_value=<optimized out>, check_for_computability=<optimized out>) at sql_base.cc:9384

#13 0x0000000000a698b4 in fill_record_n_invoke_before_triggers (thd=0x62b00015e218, table=0x150e92cf6220, ptr=0x619000073ac8, values=@0x6290000a0f60: {<base_list> = {<Sql_alloc> = {<No data fields>}, first = 0x6290000a1000, last = 0x6290000a1000, elements = 1}, <No data fields>}, ignore_errors=<optimized out>, event=TRG_EVENT_INSERT) at sql_base.cc:9439

#14 0x0000000000b1a27a in mysql_insert (thd=<optimized out>, table_list=0x6290000a0358, fields=<optimized out>, values_list=<optimized out>, update_fields=<optimized out>, update_values=<optimized out>, duplic=<optimized out>, ignore=<optimized out>, result=<optimized out>) at sql_insert.cc:1122

#15 0x0000000000c1439e in mysql_execute_command (thd=0x62b00015e218, is_called_from_prepared_stmt=<optimized out>) at sql_parse.cc:4459

#16 0x0000000000bf88b1 in mysql_parse (thd=0x62b00015e218, rawbuf=<optimized out>, length=<optimized out>, parser_state=<optimized out>) at sql_parse.cc:7889

#17 0x0000000000bf212f in dispatch_command (command=<optimized out>, thd=0x62b00015e218, packet=<optimized out>, packet_length=<optimized out>, blocking=<optimized out>) at sql_parse.cc:1892

#18 0x0000000000bf958a in do_command (thd=0x62b00015e218, blocking=true) at sql_parse.cc:1405

#19 0x00000000010b3043 in do_handle_one_connection (connect=<optimized out>, put_in_cache=<optimized out>) at sql_connect.cc:1448

#20 0x00000000010b2668 in handle_one_connection (arg=0x608000002638) at sql_connect.cc:1350

#21 0x0000150eb6061609 in start_thread (arg=<optimized out>) at pthread_create.c:477

#22 0x0000150eb5d77133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95