---
 winsup/cygwin/fhandler_tty.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index f6a7a6cf9..bb18d139e 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -3422,6 +3422,7 @@ skip_create:
       HeapFree (GetProcessHeap (), 0, hp);
     }
 
+  acquire_attach_mutex (mutex_timeout);
   if (get_ttyp ()->previous_code_page)
     SetConsoleCP (get_ttyp ()->previous_code_page);
   if (get_ttyp ()->previous_output_code_page)
@@ -3452,6 +3453,7 @@ skip_create:
        mode |= DISABLE_NEWLINE_AUTO_RETURN;
       SetConsoleMode (hpConOut, mode);
     }
+  release_attach_mutex ();
 
   return true;
 
-- 
2.36.0

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