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Subject: pip install ocassionally hangs
Thread-Topic: pip install ocassionally hangs
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Date: Mon, 29 Jan 2024 16:00:39 +0000
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From: Daniel Abrahamsson via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Daniel Abrahamsson <daniel DOT abrahamsson AT prover DOT com>
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Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

Hi,

Since some time ago (perhaps a week or two), "pip install" occassionally hangs.
Ctrl+C does not work. I have to kill the process via the task manager. I can
reproduce the problem somewhat reliably by running:

    pip install --force jenkins_job_builder==5.0.4

This is the last thing printed before the process hangs:

    Downloading requests-2.31.0-py3-none-any.whl (62 kB)
      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 62.6/62.6 kB 1.2 MB/s eta 0:00:00
    Using cached certifi-2023.11.17-py3-none-any.whl (162 kB)
    Using cached charset_normalizer-3.3.2-py3-none-any.whl (48 kB)
    Downloading idna-3.6-py3-none-any.whl (61 kB)
      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 0.0/61.6 kB ? eta -:--:--

I tried attaching to the python39 process with strace and got the following
message repeated over and over again:

    --- Process 41672 (pid: 1250), exception c0000005 at 0000000000000000

Cygwin version: 3.5.0-0.615.g1c13ca67b506.x86_64
Python version: Python 3.9.18
pip version: pip 23.3.2

Regarding the Cygwin version, a colleague ran into the same problem on the 3.4
branch, so I don't think it is related to anything new on the 3.5 branch.

Any ideas on how to debug this?

Regards,
Daniel Abrahamsson

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