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[Ghanshyam Mann <1883200@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

with the new release of sphinx 3.1.0, nova pdf docs build started
failing with "! Dimension too large." error. That started failing since
10th June when the OpenStack requirement added a new constraint for
sphinx.

Seems like somewhere TeX memory is exhausted during the pdf building. If
I am not wrong we are hitting this open sphinx bug[1]. I checked the
doc/source/_static/images dimensions first which is what I doubted at
the very first place and there is no issue in images. Verified that by
tried to build the pdf without images and got the same error.

-
https://zuul.opendev.org/t/openstack/build/9c3e835ad5ee4842a07d77fdbaa6c97d/log
/sphinx-build-pdf.log#7661

I cannot find any related changes in sphinx 3.1.0 also 
- https://www.sphinx-doc.org/en/master/changes.html
- https://github.com/sphinx-doc/sphinx/commits/v3.1.0

[1] https://github.com/sphinx-doc/sphinx/issues/3099

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1883200

Title:
  pdf-docs build failing on sphinx 3.1.0

Status in OpenStack Compute (nova):
  New

Bug description:
  with the new release of sphinx 3.1.0, nova pdf docs build started
  failing with "! Dimension too large." error. That started failing
  since 10th June when the OpenStack requirement added a new constraint
  for sphinx.

  Seems like somewhere TeX memory is exhausted during the pdf building.
  If I am not wrong we are hitting this open sphinx bug[1]. I checked
  the doc/source/_static/images dimensions first which is what I doubted
  at the very first place and there is no issue in images. Verified that
  by tried to build the pdf without images and got the same error.

  -
  https://zuul.opendev.org/t/openstack/build/9c3e835ad5ee4842a07d77fdbaa6c97d/log
  /sphinx-build-pdf.log#7661

  I cannot find any related changes in sphinx 3.1.0 also 
  - https://www.sphinx-doc.org/en/master/changes.html
  - https://github.com/sphinx-doc/sphinx/commits/v3.1.0

  [1] https://github.com/sphinx-doc/sphinx/issues/3099

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