[Bug 2017853] Re: LXML dependency needs to be updated to fix segmentation fault

[Paride Legovini]

Hello Dennis, thanks for testing the PPA. The patch Lena identified was
really promising: by looking at the commit messages I can't identify a
better candidate between 4.9.0 and 4.9.2:

  https://github.com/lxml/lxml/compare/lxml-4.9.0...lxml-4.9.2

Could you please double check you actually have the PPA version
installed, e.g. by doing

  dpkg -l | grep lxml

and checking that the installed lxml packages have ~ppa1 in their
version string? Also: please make sure that while testing the PPA
packages installed from pip are not interfering.

If everything looks good, could you please try installing version 4.9.1
from pip? This way we'll be able to tell which version contains the fix.
You can install a specific version from pip with e.g.:

  pip3 install lxml==4.0.1

Thanks!

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https://bugs.launchpad.net/bugs/2017853

Title:
  LXML dependency needs to be updated to fix segmentation fault

Status in crmsh package in Ubuntu:
  Incomplete
Status in lxml package in Ubuntu:
  Incomplete

Bug description:
  After upgrading our pacemaker/corosync cluster to Ubuntu 22.04 we had
  segmentation faults when running "crm configure". Using faulthandler
  to generate a python stacktrace yielded:

  Fatal Python error: Segmentation fault

  Current thread 0x00007efe7677a1c0 (most recent call first):
    File "/usr/lib/python3/dist-packages/crmsh/cibconfig.py", line 58 in show_unrecognized_elems
    File "/usr/lib/python3/dist-packages/crmsh/cibconfig.py", line 2779 in initialize
    File "/usr/lib/python3/dist-packages/crmsh/ui_configure.py", line 492 in requires
    File "/usr/lib/python3/dist-packages/crmsh/ui_context.py", line 265 in enter_level
    File "/usr/lib/python3/dist-packages/crmsh/ui_context.py", line 84 in run
    File "/usr/lib/python3/dist-packages/crmsh/main.py", line 196 in handle_noninteractive_use
    File "/usr/lib/python3/dist-packages/crmsh/main.py", line 249 in main_input_loop
    File "/usr/lib/python3/dist-packages/crmsh/main.py", line 370 in run
    File "/usr/sbin/crm", line 46 in <module>

  Extension modules: lxml._elementpath, lxml.etree (total: 2)
  Segmentation fault

  At that point, the code was using the findall method of lxml._Element
  to search through our (valid) cib configuration.

  Using pip3 install --upgrade lxml to update lxml to version 4.9.2
  solved this problem.

  I'm not really sure what specific bug was fixed, but I assume that it
  was this one in 4.9.1: https://lxml.de/4.9/changes-4.9.1.html

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