Thanks for reporting the issue, Thorsten. I'm attempting to reproduce the issue on stretch, in a container:
# cat repro.sh #!/bin/ksh cat TODO | while read line; do ls; done # cat TODO 1 2 3 4 # ksh --version version sh (AT&T Research) 93u+ 2012-08-01 # dpkg -l | grep ksh ii ksh 93u+20120801-3.1 amd64 Real, AT&T version of the Korn shell # ./repro.sh TODO repro.sh TODO repro.sh TODO repro.sh TODO repro.sh Same with the latest on sid. Did you have to do anything apart from the above to reproduce on your end? Anuradha