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Re: Cygwin 3.1.2: Every call of exec(2) in the session starts to create a console window after some TTY outputs from programs compiled with "-mwindows"

Am 20.01.2020 um 07:13 schrieb Koichi Murase:
Hi, I updated Cygwin from 3.0.7 to 3.1.2 and have two problems.  This
is the report for one of them.  (For the other one, read(2)
occasionally fails on the new cygwin console for some settings, but
I'm still trying to pin down the issue.)

Cygwin Version:

   Cygwin 3.1.2 x86_64 on Windows 10.  I also confirmed that the
   problem is not fixed with the latest commit 85aff2830 of
   newlib-cygwin.  Note that Cygwin 3.0.7 doesn't have this problem.

Brief Description:

   As in the subject, this problem is caused after some TTY outputs from
   programs compiled with "-mwindows".  For example, after running the
   command "mintty.exe --version" in a terminal, every "exec" called in
   the processes in the same session starts to create a console window
   which will be closed instantaneously.  As results, the display is
   always flashing when some scripts are running, the shell scripts
   becomes very slow, some of user inputs to the terminal go to the
   created window and get lost, and CPU usage extremely increases.
   This problem was not present in Cygwin 3.0.7.


   The following is one example to reproduce it:

   1. Open Cygwin Terminal (mintty)
   2. Run "mintty --version"
   3. Run some shell scripts, e.g., "for i in {0..99}; do date; done | uniq -c"

I can not replicate with latest snapshot

$ uname -a
CYGWIN_NT-10.0 LAPTOP-82F08ILC 3.1.2s(0.340/5/3) 2020-01-14 16:33 x86_64 Cygwin

$ mintty --version
mintty 3.1.0 (x86_64-pc-cygwin)

$ for i in {0..99}; do date; done | uniq -c
      6 Mon, Jan 20, 2020  8:15:49 AM
     18 Mon, Jan 20, 2020  8:15:50 AM
     19 Mon, Jan 20, 2020  8:15:51 AM
     16 Mon, Jan 20, 2020  8:15:52 AM
     20 Mon, Jan 20, 2020  8:15:53 AM
     21 Mon, Jan 20, 2020  8:15:54 AM

Problem reports:
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