LP:619731 - Aria recovery corruption "Page 1: Row: 1 has an extent with wrong information in bitmap"

The following RQG command line:

perl runall.pl \
--queries=1M \
--engine=Maria \
-mysqld=-log-output=file \
--reporters=ErrorLog,Backtrace,Recovery,Shutdown \
--duration=120 \
--threads=20 \
--rows=1000 \
--mask-level=1 \
-mysqld=-maria-repair-threads=2 \
-mysqld=-loose-maria-group-commit=hard \
-mysqld=-loose-maria_group_commit_interval=1 \
-mysqld=-maria-checkpoint-interval=1 \
-mysqld=-maria-block-size=4K \
--grammar=conf/engines/many_indexes.yy \
--gendata=conf/engines/many_indexes.zz \
--mask=18168 \
--queries=100000000 \
--basedir=/home/philips/bzr/maria-5.1/

reported the following corruption on CHECK TABLE EXTENDED

'Page 1: Row: 1 has an extent with wrong information in bitmap: Page 192 Page_type: 2 Bitmap: 0'