I can now reliably reproduce this with fio (see config following email), but 
never under valgrind so far.

James

[global]
directory=/tmp/fio
size=128M
ioengine=libaio

[randwrite1]
rw=randwrite
iodepth=32

[randread1]
rw=randread
iodepth=32

[randwrite2]
rw=randwrite
iodepth=32

[randread2]
rw=randread
iodepth=32
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