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

[Takashi Yano]

On Wed, 19 Feb 2025 16:23:41 +0900
Takashi Yano wrote:
> On Wed, 19 Feb 2025 07:59:00 +0100
> Cedric Blancher wrote:
> > 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
> 
> Please provide full command line that can reproduce your problem.
> I can not see any pipe in above command.
> 
> > 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.

I believe this issue is same as:
https://cygwin.com/pipermail/cygwin/2025-February/257400.html

I'm trying to reproduce the issue using the test case attached.
However, I still cannot.

Any additional information?

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: reproducer.sh
URL: <https://cygwin.com/pipermail/cygwin/attachments/20250220/87e10e42/attachment.ksh>