For some character sets, SET NAMES <charset> is forbidden.
However, the client still allows \C <charset> without a complaint, and the next command causes a SIGSEGV.
--exec $MYSQL test -e '\C utf32 ; SELECT 1'
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--echo # Success
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10.5 3d4174762563afcc2532e86c5a6c5686daa52fad
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Program terminated with signal SIGSEGV, Segmentation fault.
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#0 0x000055609b217f79 in add_line (buffer=..., line=0x55609cb86408 "\\C utf32 ; SELECT 1", line_length=19, in_string=0x7fff6110f026 "", ml_comment=0x7fff6110f027, truncated=false) at /data/bld/10.5-debug/client/mysql.cc:2388
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2388 if (my_isspace(charset_info,inchar) && (out == line) &&
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Thread 1 (Thread 0x7f23738a0740 (LWP 2705702)):
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#0 0x000055609b217f79 in add_line (buffer=..., line=0x55609cb86408 "\\C utf32 ; SELECT 1", line_length=19, in_string=0x7fff6110f026 "", ml_comment=0x7fff6110f027, truncated=false) at /10.5/client/mysql.cc:2388
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#1 0x000055609b2177c4 in read_and_execute (interactive=false) at /10.5/client/mysql.cc:2210
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#2 0x000055609b216172 in main (argc=12, argv=0x55609cb86960) at /10.5/client/mysql.cc:1286
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Reproducible with all existing versions, and (at least) with MySQL 8.0.35.
Bug
Major
