I experienced the same bug with syslog flooded. It seems that it happens
when PDF or SVG documents have embedded LaTeX font (often cmr10 but I
bet that with others it would be the same) gnome has problems with
generating thumbnails. In my case it is looking for the right TFM file
in texlive font directory:

gnome-session[3640]: page: Warning: font `cmr10' not found, trying metric files 
instead
gnome-session[3640]: page: Error: 
/usr/share/texlive/texmf-dist/fonts/tfm/public/cm/cmr10.tfm: File corrupted, or 
not a TFM file

and it finds it corrupted and retries filling the log.

When I remove the "corrupted" file gnome tries to regenerate it but it
finds the folder read-only.

gnome-session[3640]: kpathsea: Running mkofm cmr10
gnome-session[3640]: mkofm: Permission denied

I solved the problem by regenerating TFM manually: mktextfm cmr10 and
substituting the TFM file in texlive.

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https://bugs.launchpad.net/bugs/1497727

Title:
  evince-thumbnailer DOSes rsyslogd

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