Bug#913138: linux: I/O on md RAID 6 hangs completely
I suffer the same problem while running RAID1 with kernel 4.18.10-2.
I have found a hint in the Debian kernel mailing list, however, I haven't tested it yet:
"...Someone else suggested this might be related to using "blk-mq", so
could you try with these parameter:
dm_mod.use_blk_mq=0 scsi_mod.use_blk_mq=0
Also, do you have laptop-mode-tools installed?
Ben..."
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