error when make pdfdocs

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I git clone and git pull the latest linux kernel.
When I make pdfdocs, it reports the following error to me.
But I checked the filesystems.xml:14946, no error found.

-----------------------------------------------------------------------------------------------
  PDF     Documentation/DocBook/filesystems.pdf
Using catalogs: /etc/sgml/catalog
Using stylesheet: /usr/share/docbook-utils/docbook-utils.dsl#print
Working on: /home/mdl/Repos/linux/Documentation/DocBook/filesystems.xml
openjade:/home/mdl/Repos/linux/Documentation/DocBook/filesystems.xml:14946:16:E:
end tag for "variablelist" which is not finished
Documentation/DocBook/Makefile:131: recipe for target
'Documentation/DocBook/filesystems.pdf' failed
make[1]: *** [Documentation/DocBook/filesystems.pdf] Error 8
Makefile:1339: recipe for target 'pdfdocs' failed
-----------------------------------------------------------------------------------------------

    - mudongliang
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