Re: md_raid: mdX_raid6 looping after sync_action "check" to "idle" transition

[Donald Buczek <buczek@xxxxxxxxxxxxx>]

Dear Guoging,

I think now that this is not an issue for md. I've driven a system into that situation again and have clear indication, that this is a problem of the member block device driver.

With md0 in the described errornous state (md0_raid6 busy looping, echo idle > .../sync_action blocked, no progress in mdstat) and md1 operating normally:

    root:deadbird:/scratch/local/# for f in /sys/devices/virtual/block/md?/md/rd*/block/inflight;do echo $f: $(cat $f);done
    /sys/devices/virtual/block/md0/md/rd0/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd1/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd10/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd11/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd12/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd13/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd14/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd15/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd2/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd3/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd4/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd5/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd6/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd7/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd8/block/inflight: 1 0
    /sys/devices/virtual/block/md0/md/rd9/block/inflight: 1 0
    /sys/devices/virtual/block/md1/md/rd0/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd1/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd10/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd11/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd12/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd13/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd14/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd15/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd2/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd3/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd4/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd5/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd6/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd7/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd8/block/inflight: 0 0
    /sys/devices/virtual/block/md1/md/rd9/block/inflight: 0 0

Best
  Donald