"lbzip2 -t
/public/dumps/public/wikidatawiki/20160801/wikidatawiki-20160801-pages-articles.xml.bz2"
succeeds for me on Labs. You should compare the checksum of your copy
with
https://dumps.wikimedia.org/wikidatawiki/20160801/wikidatawiki-20160801-sha…
(says c6a823508240d161e481e5d0045921421a9db5f1
wikidatawiki-20160801-pages-articles.xml.bz2 ).
Nemo