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Date: Fri, 3 Jan 2025 11:45:23 -0800 (PST)
To: Michael Cook <michael@waxrat.com>
Subject: Re: random hangs
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From: Jeremy Drake via Cygwin <cygwin@cygwin.com>
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Cc: Robert Terzi <rct@r-t.org>, cygwin@cygwin.com
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There are known (and as yet unknown) hang issues with cygwin 3.5.5, the
known being in signal handling.  You might try with cygwin 3.5.4 to see if
your hang issues go away.  That might help elimiate python as the culprit.

On Fri, 3 Jan 2025, Michael Cook via Cygwin wrote:

> The hangs I've looked at were when a Python script was using the
> `subprocess` module to run external commands like `stty size` and `conan`.
> May very well not be a Python issue at all but instead some kind of deeper
> Cygwin thing.
>
> One path forward might be to change this "couldn't interrupt. trying again"
> loop to give up eventually, say after 100 tries. That might lead to a
> greater understanding of what's happening?
>
> On Fri, Jan 3, 2025 at 2:21 PM Marco Atzeri <marco.atzeri@gmail.com> wrote:
>
> > On 03/01/2025 18:31, Michael Cook via Cygwin wrote:
> > > I'm seeing hangs at the moment in a reproducible way.
> > >
> > > One of the hung processes is stty.exe.
> > > I attached with strace and saw the following three messages being rapidly
> > > repeated:
> > >
> > >     64 115520392 [sig] stty 20375 sigpacket::setup_handler: suspending
> > > thread, tls 0x7FFFFCE00, _main_tls 0x7FFFFCE00
> > >     77 115520469 [sig] stty 20375 _cygtls::inside_kernel: pc
> > 0x7FF91290D574,
> > > h 0x7FF912870000, inside_kernel 1
> > >     66 115520535 [sig] stty 20375 sigpacket::setup_handler: couldn't
> > > interrupt.  trying again.
> > >
> > > Is this interesting?
> > >
> > > The command was simply `stty size`.
> > >
> > > Michael
> > >
> >
> > how to reproduce as `stty size` as it is not a python command ?
> > Or are you saying that you see general cygwin hang issue ?
> >
> > Regards
> > Marco
> >
> >
> >
> >
> >
> >
> >
>
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