Comment 49 for bug 1942935

Linux version 6.4.12-200.fc38.x86_64 (mockbuild@30894952d3244f1ab967aeda9ed417f6) (gcc (GCC) 13.2.1 20230728 (Red Hat 13.2.1-1), GNU ld version 2.39-9.fc38) #1 SMP PREEMPT_DYNAMIC Wed Aug 23 17:46:49 UTC 2023

    230 ? I< 0:00 \_ [md]
   1377 ? S 6:15 \_ [md0_raid1]
   1565 ? D 4955:37 \_ [md4_raid6]
2772538 ? DN 111:11 \_ [md4_resync]

# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
md0 : active raid1 sde2[0]
      13671170048 blocks super 1.2 [1/1] [U]
      bitmap: 1/102 pages [4KB], 65536KB chunk

md4 : active raid6 sdd1[2] sdb1[5] sde1[4] sdc1[1]
      11720779776 blocks super 1.2 level 6, 512k chunk, algorithm 2 [4/4] [UUUU]
      [=================>...] check = 89.0% (5217054876/5860389888) finish=852549.6min speed=12K/sec
      bitmap: 9/44 pages [36KB], 65536KB chunk

unused devices: <none>
# cat /proc/2772538/stack # md4_resync
[<0>] raid5_get_active_stripe+0x271/0x540 [raid456]
[<0>] raid5_sync_request+0x3ad/0x3d0 [raid456]
[<0>] md_do_sync+0x7be/0x11c0
[<0>] md_thread+0xae/0x190
[<0>] kthread+0xe8/0x120
[<0>] ret_from_fork+0x2c/0x50
# cat /proc/1565/stack # md4_raid6
[<0>] raid5d+0x524/0x750 [raid456]
[<0>] md_thread+0xae/0x190
[<0>] kthread+0xe8/0x120
[<0>] ret_from_fork+0x2c/0x50

Workarounded by:
# cat /sys/block/md4/md/array_state
write-pending
# echo active > /sys/block/md4/md/array_state
# cat /sys/block/md4/md/array_state
active