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The failure happens reliably on ASAN builds (debug and RelWithDebInfo), on different machines, but specifically built with gcc-10; not with gcc-9 or earlier, and not with clang-10/11/12.
I didn't check other compilers.
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10.2 746050d0 ASAN build
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#3 <signal handler called>
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#4 0x0000000000000000 in ?? ()
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#5 0x000055a8b3ef5089 in Item_func_encrypt::val_str (this=0x62b0000005d0, str=0x7f9de1a77c90) at /10.2/src/sql/item_strfunc.cc:2230
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#6 0x000055a8b3daf3e3 in Item::send (this=0x62b0000005d0, protocol=0x62a00005a828, buffer=0x7f9de1a77c90) at /10.2/src/sql/item.cc:6952
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#7 0x000055a8b3544e47 in Protocol::send_result_set_row (this=0x62a00005a828, row_items=0x62a00005e548) at /10.2/src/sql/protocol.cc:993
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#8 0x000055a8b369c101 in select_send::send_data (this=0x62b000000798, items=...) at /10.2/src/sql/sql_class.cc:2792
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#9 0x000055a8b3802b33 in JOIN::exec_inner (this=0x62b0000007c0) at /10.2/src/sql/sql_select.cc:3527
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#10 0x000055a8b38019b3 in JOIN::exec (this=0x62b0000007c0) at /10.2/src/sql/sql_select.cc:3446
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#11 0x000055a8b380509c in mysql_select (thd=0x62a00005a270, tables=0x0, wild_num=0, fields=..., conds=0x0, og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147748608, result=0x62b000000798, unit=0x62a00005dcd0, select_lex=0x62a00005e420) at /10.2/src/sql/sql_select.cc:3849
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#12 0x000055a8b37e1fd6 in handle_select (thd=0x62a00005a270, lex=0x62a00005dc10, result=0x62b000000798, setup_tables_done_option=0) at /10.2/src/sql/sql_select.cc:361
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#13 0x000055a8b37601dc in execute_sqlcom_select (thd=0x62a00005a270, all_tables=0x0) at /10.2/src/sql/sql_parse.cc:6271
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#14 0x000055a8b374d5da in mysql_execute_command (thd=0x62a00005a270) at /10.2/src/sql/sql_parse.cc:3582
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#15 0x000055a8b37690ae in mysql_parse (thd=0x62a00005a270, rawbuf=0x62b000000410 "SELECT ENCRYPT('x')", length=19, parser_state=0x7f9de1a79e00, is_com_multi=false, is_next_command=false) at /10.2/src/sql/sql_parse.cc:7793
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#16 0x000055a8b3742d49 in dispatch_command (command=COM_QUERY, thd=0x62a00005a270, packet=0x6290000eb271 "", packet_length=19, is_com_multi=false, is_next_command=false) at /10.2/src/sql/sql_parse.cc:1827
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#17 0x000055a8b373fcbe in do_command (thd=0x62a00005a270) at /10.2/src/sql/sql_parse.cc:1381
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#18 0x000055a8b3aab1a7 in do_handle_one_connection (connect=0x611000004e30) at /10.2/src/sql/sql_connect.cc:1336
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#19 0x000055a8b3aaaaac in handle_one_connection (arg=0x611000004e30) at /10.2/src/sql/sql_connect.cc:1241
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#20 0x00007f9de891bea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
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#21 0x00007f9de8520def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
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I'm not sure whether it's a real problem or a bogus error, but it's rather painful for tests, as it prevents from upgrading to newer distribution versions.
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