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

[Dennis Plöger]

Yes. The ppa-version is installed:

    ii  python3-lxml:amd64                     4.8.0-1ubuntu0.1~ppa1
amd64        pythonic binding for the libxml2 and libxslt libraries

And yes, installing lxml 4.9.1 using pip worked.

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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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