https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=b7e429420063264d0be7ee6804f3e6f143f66232

commit b7e429420063264d0be7ee6804f3e6f143f66232
Author: Takashi Yano <takashi.y...@nifty.ne.jp>
Date:   Thu Sep 5 19:44:41 2019 +0900

    Cygwin: pty: Fix potential state mismatch regarding pseudo console.
    
    - PTY with pseudo console support sitll has problem which potentially
      cause state mismatch between state variable and real console state.
      This patch fixes this issue.

Diff:
---
 winsup/cygwin/dtable.cc | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/dtable.cc b/winsup/cygwin/dtable.cc
index 4e9b6ed..7b2e520 100644
--- a/winsup/cygwin/dtable.cc
+++ b/winsup/cygwin/dtable.cc
@@ -159,14 +159,19 @@ dtable::stdio_init ()
            {
              bool attached = !!fhandler_console::get_console_process_id
                (ptys->getHelperProcessId (), true);
-             if (!attached)
+             if (attached)
+               break;
+             else
                {
                  /* Not attached to pseudo console in fork() or spawn()
                     by some reason. This happens if the executable is
                     a windows GUI binary, such as mintty. */
                  FreeConsole ();
                  if (AttachConsole (ptys->getHelperProcessId ()))
-                   break;
+                   {
+                     ptys->fixup_after_attach (false);
+                     break;
+                   }
                }
            }
        }

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