Comment # 4 on bug 1232402 from Oleksii Prudkyi

I had also the same error with udev-worker (mentioned it in first description
but without logs) on 6.4.0-150600.23.25-default

so, probably, it is not md alone , maybe some part related to freezing all
processes 
```
[  T998] Freezing user space processes failed after 20.004 seconds (1 tasks
refusing to freeze, wq_busy=0):
[  T998] task:(udev-worker)   state:D stack:0     pid:620   tgid:620   ppid:430
   flags:0x00000006
[  T998] Call Trace:
[  T998]  <TASK>
[  T998]  __schedule+0x381/0x1540
[  T998]  ? __pfx_autoremove_wake_function+0x10/0x10
[  T998]  schedule+0x24/0xb0
[  T998]  _md_handle_reqeust+0x7e/0x1e0 [md_mod
dc71c1fc6aeb160a219080a6f7f64626cf165910]
[  T998]  ? __pfx_autoremove_wake_function+0x10/0x10
[  T998]  __submit_bio+0xa8/0x150
[  T998]  submit_bio_noacct_nocheck+0x153/0x370
[  T998]  ? mpage_readahead+0x10c/0x140
[  T998]  mpage_readahead+0x10c/0x140
[  T998]  ? __pfx_blkdev_get_block+0x10/0x10
[  T998]  read_pages+0x5a/0x220
[  T998]  page_cache_ra_unbounded+0x131/0x180
[  T998]  filemap_get_pages+0xff/0x5a0
[  T998]  ? do_filp_open+0xd9/0x140
[  T998]  filemap_read+0xcc/0x330
[  T998]  ? aa_file_perm+0x125/0x500
[  T998]  blkdev_read_iter+0xb8/0x150
[  T998]  vfs_read+0x22d/0x2e0
[  T998]  ksys_read+0xa5/0xe0
[  T998]  do_syscall_64+0x58/0x80
[  T998]  ? exc_page_fault+0x69/0x150
[  T998]  entry_SYSCALL_64_after_hwframe+0x7c/0xe6
[  T998] RIP: 0033:0x7fa36ba44b6d
[  T998] RSP: 002b:00007ffc6c1351e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[  T998] RAX: ffffffffffffffda RBX: 000056397d6a8dd0 RCX: 00007fa36ba44b6d
[  T998] RDX: 0000000000000040 RSI: 000056397d6713d8 RDI: 000000000000000c
[  T998] RBP: 00000064515e0000 R08: 0000000000000070 R09: 0000000000000001
[  T998] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000040
[  T998] R13: 000056397d6a8e28 R14: 000056397d6713c8 R15: 000056397d6713b0
[  T998]  </TASK>
[  T998] OOM killer enabled.
[  T998] Restarting tasks ... done.
[  T998] PM: hibernation: resume failed (-16)

```