On Tue, 22 Mar 2022, Takashi Yano wrote:

> > Thanks for the report. This is expected problem as mentioned
> > in b531d6b commit message. However, I could not imagin the
> > situation that the service has multiple writer for the pipe
> > and one of them is a non-cygwin app.
> >
> > Question is: Does the docker invoke the command using SYSTEM
> > account? Or is the processes in docker determined as running
> > as a service?
>
> I confirmed the processes in Windows docker are running as
> well_known_service_sid. Let me consider a while.
>

Just got another report to MSYS2 of this behavior, this time from a Gitlab
CI runner that is running as a service and trying to pipe output from
Microsoft cl.exe while running configure.  This user reports that 3.3.4
with your "[PATCH v2] Cygwin: pipe: Avoid deadlock for non-cygwin writer."
applied to it does not solve the problem.

https://github.com/msys2/MSYS2-packages/issues/2893

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