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Subject: random hangs (was: Test: python312-3.12.8-1 venv fails due to pip
 wheel?)
To: Robert Terzi <rct AT r-t DOT org>
Cc: cygwin AT cygwin DOT com
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From: Michael Cook via Cygwin <cygwin AT cygwin DOT com>
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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

On Thu, Jan 2, 2025 at 1:38 PM Robert Terzi via Cygwin <cygwin AT cygwin DOT com>
wrote:

> Restarting the pip install of iPython eventually worked.
>
> Pip didn't try to redownload either of the packages it previous hung on,
> so I guess the download was successful.
> I don't know whether pip is running anything via a subprocess.
>
> However, once I fire up the newly installed 3.12 iPython, it comes up, but
> hangs the same way if I just hit enter at the prompt.
>
> --- Process 31388 (pid: 4569), exception c0000005 at 0000000000000000
>
>
> On 1/2/2025 1:28 PM, Michael Cook wrote:
> > All the pip install commands I tried worked.
> > But I did see one of my scripts hang trying to run an external command
> (via the subprocess module).
> > I've seen that only once so far.
> >
> > On Thu, Jan 2, 2025 at 1:23 PM Robert Terzi via Cygwin <
> cygwin AT cygwin DOT com> wrote:
> >
> >     Thanks Michael that worked to create the venv.
> >
> >     Did you have any success with pip installs?
> >
> >     For me, simple modules like requests worked but for larger things
> like ipython, Python 3.12 hung hard downloading requirements.
> >
> >     Downloading pygments-2.18.0-py3-none-any.whl (1.2 MB)
> >         ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 0.0/1.2 MB ? eta
> -:--:--(py312)
> >
> >
> >     I couldn't kill python3.12 with any signal using Cygwin kill.
> However, I was able to end process with Windows Task Manager.
> >
> >     Trying again and doing an strace, it seemed to get stuck in a loop
> on this:
> >
> >     --- Process 29448 (pid: 4552), exception c0000005 at 0000000000000000
> >
> >     It is using 100% of 1 core while doing that.
> >
> >     I could be wrong, but it looks like there might still be a hanging
> problem with 3.12 on Cygwin.
> >
> >
> >     On 1/2/2025 12:42 PM, Michael Cook wrote:
> >     > As a workaround, you can try passing `--without-pip`.
> >     > I had success with this:
> >     >
> >     >     python -m venv --system-site-packages --without-pip _venv
> >     >
> >     >
> >     > Michael
> >     >
> >     > On Thu, Jan 2, 2025 at 11:38 AM Robert Terzi via Cygwin <
> cygwin AT cygwin DOT com> wrote:
> >     >
> >     >     Testing the 3.12 package, trying to make a virtual env fails.
> I think this is because it is looking for the pip wheel.
> >     >
> >     >     I've installed the available 3.12 packages (pip, wheel,
> setuptools, devel).
> >     >
> >     >     venv fails with/without --system-site-packages.  I think venv
> is trying to run '-m ensurepip' which seems to
> >     >     have a dependency on pip wheel.
> >     >
> >     >     $ python3.12 -m venv /srv/pyvenvs/py312
> >     >     Error: Command '['/srv/pyvenvs/py312/bin/python3.12', '-m',
> 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1.
> >     >
> >     >     $ python3.12 -m venv --system-site-packages /srv/pyvenvs/py312
> >     >     Error: Command '['/srv/pyvenvs/py312/bin/python3.12', '-m',
> 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1.
> >     >
> >     >     Trying -m ensurepip directly yields:
> >     >     $ python3.12 -m ensurepip
> >     >     [...snip...]
> >     >     FileNotFoundError: [Errno 2] No such file or directory:
> '/usr/lib/python3.12/ensurepip/_bundled/pip-24.3.1-py3-none-any.whl'
> >     >
> >     >     This works with the previously working 3.9 installation.  (I
> haven't tried the updated 3.9 install yet.)
> >     >
> >     >     For 3.9 it looks like the pip*.whl file is in a different
> location:
> >     >
> >     >     $ find /usr/lib/python* -name 'pip*.whl'
> >     >
>  /usr/lib/python3.9/site-packages/virtualenv/seed/wheels/embed/pip-20.3.4-py2.py3-none-any.whl
> >     >
>  /usr/lib/python3.9/site-packages/virtualenv/seed/wheels/embed/pip-21.3.1-py3-none-any.whl
> >     >
>  /usr/lib/python3.9/site-packages/virtualenv/seed/wheels/embed/pip-23.0.1-py3-none-any.whl
> >     >
> >     >     I haven't tried to install/build any modules/wheels since the
> intent was to test the new packages.
> >     >     Hopefully I'm not missing something obvious.
> >     >
> >     >     Thanks!
> >     >
> >     >
> >     >
> >     >
> >     >     On 12/30/2024 8:53 AM, Marco Atzeri via Cygwin-announce wrote:
> >     >     > New test release for
> >     >     >
> >     >     >     python312    3.12.8-1
> >     >     >
> >     >     > new releases for
> >     >     >
> >     >     >     python312-doc    3.12.8-1
> >     >     >
> >     >     >     python{39,312}-packaging    24.2-1
> >     >     >     python{39,312}-pip        24.3.1-1
> >     >     >     python{39,312}-setuptools    75.6.0-1
> >     >     >     python{39,312}-wheel        0.45.1-1
> >     >     >
> >     >     > CHANGES
> >     >     > latest upstream 3.12.x release. First packaged for Cygwin
> >     >     >
> >     >     > CYGWIN CHANGES
> >     >     > Only python 3.9 and 3.12 are updated.
> >     >     > Python 2, 3.6, 3.7, 3.8 are not anymore supported upstream.
> >     >     >
> >     >     > https://devguide.python.org/versions/#versions
> >     >     >
> >     >     > The main packages include postinstall script that
> >     >     > use "alternatives" to define for
> >     >     >
> >     >     >    /usr/bin/python
> >     >     >
> >     >     >    /usr/bin/python3
> >     >     >    /usr/bin/idle3
> >     >     >    /usr/bin/pydoc3
> >     >     >
> >     >     > a default to the highest package available.
> >     >     >
> >     >     > $ alternatives --display python
> >     >     > python - status is auto.
> >     >     >  link currently points to /usr/bin/python3.12
> >     >     > /usr/bin/python3.9 - priority 39
> >     >     > /usr/bin/python3.12 - priority 312
> >     >     > Current `best' version is /usr/bin/python3.12.
> >     >     >
> >     >     > Rationale:
> >     >     > https://www.python.org/dev/peps/pep-0394/
> >     >     > In other systems as Debian
> >     >     > /usr/bin/python is discouraged.
> >     >     >
> >     >     > DESCRIPTION
> >     >     > Python is a programming language that lets you work quickly
> >     >     > and integrate systems more effectively.
> >     >     > Python is powerful... and fast; plays well with others;
> >     >     > runs everywhere; is friendly & easy to learn; is Open.
> >     >     >
> >     >     > HOMEPAGE
> >     >     > https://www.python.org/
> >     >     >
> >     >     > Regards
> >     >     > Marco Atzeri
> >     >     >
> >     >     >
> >     >     > If you have questions or comments, please send them to the
> >     >     > cygwin mailing list at: cygwin (at) cygwin (dot) com .
> >     >
> >     >
> >     >
> >     >     --
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