On Mon, Jan 27, 2020 at 5:44 AM Georgi Nikolov <gnikolov@xxxxxxxxxxx> wrote: > > Hi, > > I posted a kernel bug about this a month ago but it did not receive any > attention: https://bugzilla.kernel.org/show_bug.cgi?id=205929 > Here is a copy of the bug report and I hope that this is the correct > place to discuss this: > > I have a Supermicro server with 10 md raid6 arrays each consisting of 8 > SATA drives. SATA drives are Hitachi/HGST Ultrastar 7K4000 8T. > When i try to pause array check with "echo idle > > "/sys/block/<md_dev>/md/sync_action" it randomly hangs at different md > device. > Process "mdX_raid6" is at 100% cpu usage. cat > /sys/block/mdX/md/journal_mode hungs forever. > > Here is the state at the moment of crash for one of the md devices: > > root@supermicro:/sys/block/mdX/md# find -mindepth 1 -maxdepth 1 -type > f|sort|grep -v journal_mode|xargs -r egrep . > ./array_size:default > ./array_state:write-pending > grep: ./bitmap_set_bits: Permission denied > ./chunk_size:524288 > ./component_size:7813895168 > ./consistency_policy:resync > ./degraded:0 > ./group_thread_cnt:4 > ./last_sync_action:check > ./layout:2 > ./level:raid6 > ./max_read_errors:20 > ./metadata_version:1.2 > ./mismatch_cnt:0 > grep: ./new_dev: Permission denied > ./preread_bypass_threshold:1 > ./raid_disks:8 > ./reshape_direction:forwards > ./reshape_position:none > ./resync_start:none > ./rmw_level:1 > ./safe_mode_delay:0.204 > ./skip_copy:0 > ./stripe_cache_active:13173 > ./stripe_cache_size:8192 > ./suspend_hi:0 > ./suspend_lo:0 > ./sync_action:check > ./sync_completed:3566405120 / 15627790336 > ./sync_force_parallel:0 > ./sync_max:max > ./sync_min:1821385984 > ./sync_speed:126 > ./sync_speed_max:1000 (local) > ./sync_speed_min:1000 (system) > > root@supermicro:~# cat /proc/mdstat > Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] > [raid4] [raid10] > md4 : active raid6 sdaa[2] sdab[3] sdy[0] sdae[6] sdac[4] sdad[5] > sdaf[7] sdz[1] > 46883371008 blocks super 1.2 level 6, 512k chunk, algorithm 2 > [8/8] [UUUUUUUU] > [====>................] check = 22.8% (1784112640/7813895168) > finish=20571.7min speed=4884K/sec Thanks for the report. Could you please confirm the kernel is 4.19.67-2+deb10u2 amd64? Also, have you tried different kernels? Song
