FreeBSD web build failed on build-web.ysv.freebsd.org

[User Www-data]

Writing legalnotice.html for legalnotice(legalnotice)
Writing vm-objects.html for sect1(vm-objects)
Writing swap-layers.html for sect1(swap-layers)
Writing freeing-pages.html for sect1(freeing-pages)
Writing prefault-optimizations.html for sect1(prefault-optimizations)
Writing page-table-optimizations.html for sect1(page-table-optimizations)
Writing page-coloring-optimizations.html for sect1(page-coloring-optimizations)
Writing conclusion.html for sect1(conclusion)
Writing allen-briggs-qa.html for sect1(allen-briggs-qa)
Writing index.html for article
Writing HTML.manifest
===> doc/books (all)
--- all ---
===> doc/books/arch-handbook (all)
--- book.html ---
env XML_CATALOG_FILES="file:///usr/local/www/build/head/en_US.ISO8859-1/books/arch-handbook/catalog-cwd.xml  file:///usr/local/www/build/head/en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/local/www/build/head/share/xml/catalog.xml  file:///usr/local/share/xml/catalog" /usr/local/bin/xsltproc  --xinclude --nonet --maxvars 20000 --stringparam latestrevision.timestamp "2018-03-13 01:04:26" --stringparam latestrevision.committer "eadler"		--stringparam latestrevision.number "51480" --param docformatnav "'1'" http://www.FreeBSD.org/XML/share/xml/freebsd-xhtml.xsl book.parsed.xml > book.html
===> doc/books/design-44bsd (all)
--- index.html ---
env XML_CATALOG_FILES="file:///usr/local/www/build/head/en_US.ISO8859-1/books/design-44bsd/catalog-cwd.xml  file:///usr/local/www/build/head/en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/local/www/build/head/share/xml/catalog.xml  file:///usr/local/share/xml/catalog" /usr/local/bin/xsltproc  --xinclude --nonet --maxvars 20000 --stringparam latestrevision.timestamp "2014-04-28 19:36:49" --stringparam latestrevision.committer "wblock"		--stringparam latestrevision.number "44677" --param docformatnav "'1'" http://www.FreeBSD.org/XML/share/xml/freebsd-xhtml-chunk.xsl book.parsed.xml
Writing legalnotice.html for legalnotice(legalnotice)
Writing overview-kernel-organization.html for sect1(overview-kernel-organization)
Writing overview-kernel-service.html for sect1(overview-kernel-service)
Writing overview-process-management.html for sect1(overview-process-management)
Writing overview-memory-management.html for sect1(overview-memory-management)
Writing overview-io-system.html for sect1(overview-io-system)
Writing overview-filesystem.html for sect1(overview-filesystem)
Writing overview-filestore.html for sect1(overview-filestore)
Writing overview-nfs.html for sect1(overview-nfs)
Writing overview-terminal.html for sect1(overview-terminal)
Writing overview-ipc.html for sect1(overview-ipc)
Writing overview-network-communication.html for sect1(overview-network-communication)
Writing overview-network-implementation.html for sect1(overview-network-implementation)
Writing overview-operation.html for sect1(overview-operation)
Writing overview.html for chapter(overview)
Writing index.html for book
Writing HTML.manifest
===> doc/books/dev-model (all)
===> doc/books/developers-handbook (all)
--- book.html ---
env XML_CATALOG_FILES="file:///usr/local/www/build/head/en_US.ISO8859-1/books/developers-handbook/catalog-cwd.xml  file:///usr/local/www/build/head/en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/local/www/build/head/share/xml/catalog.xml  file:///usr/local/share/xml/catalog" /usr/local/bin/xsltproc  --xinclude --nonet --maxvars 20000 --stringparam latestrevision.timestamp "2018-04-18 23:48:42" --stringparam latestrevision.committer "jhb"		--stringparam latestrevision.number "51572" --param docformatnav "'1'" http://www.FreeBSD.org/XML/share/xml/freebsd-xhtml.xsl book.parsed.xml > book.html
===> doc/books/faq (all)
===> doc/books/fdp-primer (all)
===> doc/books/handbook (all)
--- book.html ---
env XML_CATALOG_FILES="file:///usr/local/www/build/head/en_US.ISO8859-1/books/handbook/catalog-cwd.xml  file:///usr/local/www/build/head/en_US.ISO8859-1/share/xml/catalog.xml  file:///usr/local/www/build/head/share/xml/catalog.xml  file:///usr/local/share/xml/catalog" /usr/local/bin/xsltproc  --xinclude --nonet --maxvars 20000 --stringparam latestrevision.timestamp "2018-05-06 22:01:55" --stringparam latestrevision.committer "remko"		--stringparam latestrevision.number "51628" --param docformatnav "'1'" http://www.FreeBSD.org/XML/share/xml/freebsd-xhtml.xsl book.parsed.xml > book.html
       54.65 real         0.15 user         0.11 sys

latestrevision.timestamp "2018-05-19 18:21:10" 
latestrevision.committer "gjb"		
latestrevision.number "51668"