to reproduce the problem, only run following script on any softraid
server:
/usr/share/mdadm/checkarray --cron --all --idle --quiet;
then:
# cat /proc/mdstat
<<<
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md0 : active raid1 sda1[0] sdb1[1]
248640 blocks super 1.2 [2/2] [UU]
md1 : active raid1 sda2[0] sdb2[1]
292587328 blocks super 1.2 [2/2] [UU]
[>....................] check = 0.0% (74240/292587328) finish=65.6min
speed=74240K/sec
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https://bugs.launchpad.net/bugs/212684
Title:
RAID1 data-checks cause CPU soft lockups
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