Looks like another 'sync_action "check" to "idle" transition' bug. ``` root@done:~# ps -fp 24153 UID PID PPID C STIME TTY TIME CMD root 24153 1 0 06:00 ? 00:00:00 /bin/bash /usr/bin/mdcheck.safe --duration 06:00 root@done:~# cat /proc/24153/stack [<0>] kthread_stop+0x74/0x190 [<0>] md_unregister_thread+0x43/0x80 [<0>] action_store+0x169/0x2d0 [<0>] md_attr_store+0x80/0xf0 [<0>] kernfs_fop_write_iter+0x114/0x1b0 [<0>] vfs_write+0x2cb/0x400 [<0>] ksys_write+0x5f/0xe0 [<0>] do_syscall_64+0x40/0x90 [<0>] entry_SYSCALL_64_after_hwframe+0x64/0xce root@done:~# cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid6] [raid5] [raid4] [multipath] md2 : active raid6 sdc[0] sdo[15] sdn[14] sdm[13] sdl[12] sdk[11] sdj[10] sdi[9] sdh[8] sdg[7] sdf[6] sde[5] sdd[4] sdr[3] sdq[2] sdp[1] 109394518016 blocks super 1.2 level 6, 512k chunk, algorithm 2 [16/16] [UUUUUUUUUUUUUUUU] bitmap: 0/59 pages [0KB], 65536KB chunk md1 : active raid6 sdaa[0] sdz[15] sdy[14] sdx[13] sdw[12] sdv[11] sdu[10] sdt[16] sds[8] sdah[7] sdag[17] sdaf[5] sdae[4] sdad[3] sdac[2] sdab[1] 109394518016 blocks super 1.2 level 6, 512k chunk, algorithm 2 [16/16] [UUUUUUUUUUUUUUUU] bitmap: 1/59 pages [4KB], 65536KB chunk md0 : active raid6 sdai[0] sdax[15] sdaw[16] sdav[13] sdau[12] sdat[11] sdas[10] sdar[9] sdaq[8] sdap[7] sdao[6] sdan[17] sdam[4] sdal[3] sdak[2] sdaj[1] 109394518016 blocks super 1.2 level 6, 512k chunk, algorithm 2 [16/16] [UUUUUUUUUUUUUUUU] [>....................] check = 2.5% (196401792/7813894144) finish=1035822.1min speed=122K/sec bitmap: 51/59 pages [204KB], 65536KB chunk unused devices: <none> ```