Ted, thanks for your response.
I just have tested the below test by temporally enabling per-file data journalling with delalloc
and it didn't cause kernel oops any more. I will check further whether per-file data journalling
while allowing the rest of the file system to be using delalloc will cause another type of problem
or not.
dd if=/dev/zero of=/mnt/test1/file bs=1M count=4
chattr +j /mnt/test1/file
dd if=/dev/zero of=/mnt/test1/file bs=1M count=4 conv=notrunc
chattr -j /mnt/test1/file
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