I have a quick reproducer now:

NCPUS=...whatever...
for n in $( seq 1 $NCPUS ) ; do ( dd if=/dev/zero of=/mnt/test/out$n bs=1024k 
count=1024k ) & done

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https://bugs.launchpad.net/bugs/1668129

Title:
  Amazon I3 Instance Buffer I/O error on dev nvme0n1

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