[regression-3.6] Pipe between Cygwin and non Cygwin (CRT/URT) randomly loses characters

[Cedric Blancher]

Good morning!

Cygwin 3.6.0-0.374.g4dd859d01c22.x86_64 on Win10/AMD64/64bit:

Pipe between Cygwin and non Cygwin (CRT/URT) randomly loses
characters. We do not have a reproducer yet, but it is happening at
least hourly on our test machines. Sometimes we only get a single
character, and sometimes words are missing.

Typically it happens like this:
bash -c 'typeset bar="$( powershell -Command ...) ; echo "${bar}""',
where bar does not contain the full output
Same happens with dash and ksh93.

This does not happen between Cygwin processes, i.e. if I compile a
program with UCRT and read from a Cygwin program it fails, and if I
compile the same sources against Cygwin and pipe it into a Cygwin
program it works.

Ced
-- 
Cedric Blancher <cedric.blancher@gmail.com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur