mintty crashes on Windows 7

[Orgad Shaneh]

On Tue, May 3, 2022 at 7:10 PM Takashi Yano <takashi.yano@nifty.ne.jp> wrote:
>
> On Tue, 3 May 2022 18:52:28 +0300
> Orgad Shaneh wrote:
> > On Tue, May 3, 2022 at 6:23 PM Takashi Yano <takashi.yano@nifty.ne.jp> wrote:
> > >
> > > On Tue, 3 May 2022 14:47:17 +0300
> > > Orgad Shaneh wrote:
> > > > Hi,
> > > >
> > > > Running `mintty ./bash` crashes on Windows 7 on cygwin-3_3-branch.
> > > >
> > > > Tested in MSYS2 on merge-3.3 branch from
> > > > https://github.com/orgads/msys2-runtime-1. It includes the tip of
> > > > cygwin-3_3-branch as of today (05827d2df8).
> > > >
> > > I cannot reproduce this with cygwin git head of cygwin-3_3-branch.
> > > Is this MSYS2 specific problem?
> >
> > You're right. I can't reproduce either. Only in my MSYS branch.
> >
> > Can you give me some guidance how to debug it?
>
> If you could identify which commit causes the issue, It would help.

0e1847fb87f5306cda6c022540560c5926627ae1 is the first bad commit
commit 0e1847fb87f5306cda6c022540560c5926627ae1
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Mon Feb 28 20:25:09 2022 +0900

    Cygwin: pty: Isolate CTRL_C_EVENTs between ptys.

    - With this patch, unique invisible consoles are created for each pty
      to isolate CTRL_C_EVENTs between ptys. This is necessary by Ctrl-C
      handling in fhandler_termios::process_sigs() for non-cygwin apps
      started in pty if the pseudo console is disabled.

 winsup/cygwin/fhandler_termios.cc |  6 ++----
 winsup/cygwin/fhandler_tty.cc     | 17 +++++++++++++++++
 winsup/cygwin/tty.cc              |  2 ++
 3 files changed, 21 insertions(+), 4 deletions(-)

I tried reverting this commit, and it fixed the crash indeed.

- Orgad