On Mon, 19 Jan 2015, Mikulas Patocka wrote: > Hi Neil > > I saw your patch "md/raid5: avoid livelock caused by non-aligned writes". > That patch is only for RAID 6, but we are seeing similar livelock on RAID5 > (mdX_raid5 is constantly looping in > raid5d/handle_active_stripes/handle_stripe/ops_run_io and some submitted > bios get stuck). The livelock happens when we issue I/O and simulate disk > failure. > > Do you think that the same issue could happen on RAID5 too? > > Do you think that the patch "md/raid5: fetch_block must fetch all the > blocks handle_stripe_dirtying wants." could fix it? > > Mikulas So, we verified that this RAID5 livelock was introduced in patch 67f455486d2ea20b2d94d6adf5b9b783d079e321. A patch a40687ff73a5b14909d6aa522f7d778b158911c5 fixes a livelock in RAID6, but a similar livelock was introduced in RAID5, that is still unfixed upstream. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
