set f [open [list | [info nameofexecutable] << {fconfigure stdout -translation binary; puts \xD6[string repeat _ 20]}]]
    fconfigure $f -profile strict -blocking 0 -buffersize 10 -translation lf -eofchar {}
    list [catch { read_blocked $f } e d] $e [dict getd $d -code ""] [dict getd $d -errorcode ""]
} -cleanup {
    if {$f ne ""} {close $f}
} -match glob -result {1 {error reading *} 1 {POSIX EILSEQ {invalid or incomplete multibyte or wide character}}}

test io-bug-73bb43fb-4 {
    Non-blocking+buffer size+encoding error panic - TCL bug 73bb42fb.
    (PoC) Delay between bytes of single utf-8 char doesn't cause encoding error with profile strict.
} -setup {
    set f ""
} -body {
    set f [open [list | [info nameofexecutable] << {
      fconfigure stdout -translation binary
      puts -nonewline "START-"; flush stdout
      foreach {ch} [split [encoding convertto \u30B3] ""] {; # 3 bytes E3 82 B3
        puts -nonewline $ch; flush stdout; if {$ch ne "\xB3"} {after 100}
      }
      puts -nonewline "-DONE"; flush stdout
    }]]
    fconfigure $f -profile strict -blocking 0 -buffersize 10 -translation lf -eofchar {}
    list [catch { read_blocked $f 12 } e d] $e [dict getd $d -code ""] [dict getd $d -errorcode ""]
} -cleanup {
    if {$f ne ""} {close $f}
} -result "0 START-\u30B3-DONE 0 {}"

rename read_blocked {}

# cleanup
foreach file [list fooBar longfile script2 output test1 pipe my_script \
	test2 test3 cat stdout kyrillic.txt utf8-fcopy.txt utf8-rp.txt] {
    removeFile $file
}