Comment 27 for bug 1799237

When I install kernel from package I have some problems with pmem emulation and I can't really test this. Here is a simple script which can be used to reproduce the problem (assuming you have pmem emulation, e.g. using memmap and ndctl installed):

sudo umount /dev/pmem0
sudo ndctl create-namespace -f -e namespace0.0 -m fsdax
sudo mkfs.ext4 /dev/pmem0 -F
sudo rm -rf /mnt/pmem
sudo mkdir /mnt/pmem
sudo mount -o dax /dev/pmem0 /mnt/pmem
sudo chmod 777 /mnt/pmem

truncate -s 1M /mnt/pmem/testfile
./test /mnt/pmem/testfile 1048576

'test' is binary of a program presented in the first message.