[Bug 1580577] Re: python2.7 crashes with SegFault when running Zope

[Ján Jockusch]

Yes, that was exactly the one I wanted to keep out. Sadly, it's not that
simple. Later patches depend on this one. If I also disable those, the
build fails. That's why it's taking so much time...

On 05/24/2016 10:14 AM, Matthias Klose wrote:
> On 17.05.2016 14:14, Ján Jockusch wrote:
>> In the mean time, I have attempted to narrow the debian/patches/* files
>> down so I can find which patch produces the problem.
> it should be enough to disable the hg-updates patch.
>

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https://bugs.launchpad.net/bugs/1580577

Title:
  python2.7 crashes with SegFault when running Zope

Status in python2.7 package in Ubuntu:
  Confirmed

Bug description:
  Source package / Package:

  python2.7_2.7.11-7ubuntu1

  System:

  Description:	Ubuntu 16.04 LTS
  Release:	16.04

  
  This is a bug report originating from the findings documented in

  https://github.com/zopefoundation/Zope/issues/56

  
  The expected behaviour is this:
  - Upon installing Zope2 in a virtualenv a default instance should work with no issues.

  What happens instead:
  - The freshly installed Zope instance causes Python to SegFault after only a few requests.

  But Python should never SegFault.

  
  The following program produces the error:

  
  #!/bin/bash
  set -e

  # Call this testing script with an argument "setup" for the first time
  # to build the testing case
  #
  # After that, the script only performs the test as described below.
  #
  # Requirements: apt-get install virtualenv python2.7-dbg
  #
  # This script needs internet access when running.

  # The python version to test:
  python=/usr/bin/python2.7-dbg

  # This part builds the testing environment

  if [ "$1" == "setup" ] ; then
      # Virtual environment with the chosen python 
      virtualenv --python ${python} --no-site-packages zope-virtualenv
      cd zope-virtualenv
      # Basic Zope installation
      ./bin/easy_install -i http://download.zope.org/Zope2/index/2.13.24 Zope2
      # Simplest possible Zope instance
      ./bin/mkzopeinstance --dir instance --user admin:admin
      cd ..
  fi

  # THE TEST

  # Run Zope instance in the background
  zope-virtualenv/instance/bin/runzope &

  # Give Zope some time to start up
  sleep 3

  # Call a few management URLs, nothing too fancy...
  urls="
  http://admin:admin@localhost:8080/Control_Panel/manage_main
  http://admin:admin@localhost:8080/Control_Panel/Database/main/manage_main
  http://admin:admin@localhost:8080/Control_Panel/Database/manage_main
  http://admin:admin@localhost:8080/Control_Panel/Database/main/manage_activity
  http://admin:admin@localhost:8080/manage
  http://admin:admin@localhost:8080/acl_users/manage_main
  http://admin:admin@localhost:8080/acl_users/manage_access
  "

  while true ; do
      for url in ${urls} ; do 
  	echo ${url}
          curl -s $url -o /dev/null
      done
  done

  # This test fails after about 10 requests with
  # Fatal Python error: ../Objects/descrobject.c:10 object at 0x??? has negative ref count -1

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