On 1/3/2025 2:45 PM, Jeremy Drake via Cygwin wrote:
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.
I'm seeing reproducible (for me) hangs with the test Python 3.12 packages under
Cygwin 3.5.4.
$ cygcheck -c | grep cyg
base-cygwin 3.8-2 OK
cygrunsrv 1.64-1 OK
cygutils 1.4.17-1 OK
cygutils-extra 1.4.17-1 OK
cygwin 3.5.4-1 OK
cygwin-devel 3.5.4-1 OK
First, I see a hang doing `python312 -m pip install ipython` in a venv.
The hang occurs during downloading. If the package is already downloaded
it doesn't hang. So I'm doing a `pip cache purge` to get it to reoccur.
It usually hangs on downloading Jedi which is a large-ish module.
Downloading jedi-0.19.2-py2.py3-none-any.whl (1.6 MB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 0.0/1.6 MB ? eta -:--:--
If I do an end task and try again, it sometimes hangs on the next
package > 1 MB:
Downloading pygments-2.18.0-py3-none-any.whl (1.2 MB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 0.0/1.2 MB ? eta -:--:--
Second, Once I get IPython installed, it hangs as soon as I hit enter
at the first prompt. (The input I give is empty, I just hit enter.)
However, if I type `quit` it will exit without hanging.
In both cases strace indicates it's stuck in a loop dealing with an
exception, exception c0000005 at 0000000000000000
(Is that maybe a null pointer deref in a signal/exception handler?)
Steps I'm taking are:
# clean up from previous runs
rm -rf /srv/pyvenvs/py312
pip3 cache purge
# Create a venv in an empty directory
python3.12 -m venv --system-site-packages --without-pip /srv/pyvenvs/py312
(The --without-pip is needed because it fails without it running `-m ensurepip`
It is looking for the pip wheel but not finding it.)
# activate venv and Install IPython
source /srv/pyvenvs/py312/bin/activate
python -m pip install ipython
# When it hangs, end task and then repeat `pip install` until it succeeds.
# Run IPython, hit enter at first prompt
$ ipython
Python 3.12.8 (main, Dec 28 2024, 22:01:20) [GCC 12.4.0]
Type 'copyright', 'credits' or 'license' for more information
IPython 8.31.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]:
# it's now hung and only task manager "End Task" will kill it.
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