[Bug 51545] New: STDOUT lost from a forked program on Cygwin/MSYS2

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51545

Bug ID: 51545
           Summary: STDOUT lost from a forked program on Cygwin/MSYS2
           Product: Wine
           Version: 6.14
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wineserver
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Hi guys!

This bug is a continuation of https://bugs.winehq.org/show_bug.cgi?id=50705
that is actually fixed and looks much like an ancient
https://bugs.winehq.org/show_bug.cgi?id=18479 , so - probably a regression.

I'm using tha latest Wine-staging build on Xubuntu. Trying to run Cygwin and
MSYS2.

But for some reason, bash sessions lose STDOUT. Nevertheless, builtins work
fine from both bash and wineconsole.
I can finally call 'ls' or 'uname -a' from wineconsole. I get the output
without closing the shell.
As for bash session - 'ls' and 'uname' just output nothing. 'uname -a > qqq'
results in an empty file. Builtins, like 'pwd' or 'pwd > qqq' - work fine. Same
for bash scripting, STDOUT is lost.