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SubjectBUG:write data to degrade raid5

i use kernel is

what i do as follow:

1, I create a raid5:
mdadm -C /dev/md5 -l 5 -n 4 /dev/sda /dev/sdb /dev/sdc /dev/sdd
--metadata=1.0 --assume-clean

2, dd if=/dev/zero of=/dev/md5 bs=1M &

write data to this raid5

3, mdadm --manage /dev/md5 -f /dev/sda

4 mdadm --manage /dev/md5 -f /dev/sdb

if i faild 2 disks ,then the OS kernel display OOP error and kernel down

do somebody know why ?

Is MD/RAID5 bug ?

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