System hang at shutdown in blk_mq_freeze_queue_wait() when using snapapi/snumbd module

Issue

• System hang in blk_mq_freeze_queue_wait() when using snapapi/snumbd module:

snumbd_open_blk(systemd-udevd,48074): Disable access (1649,9599,9599)...
snumbdctl_release(mms,9709): OK s=00000000549539f0
snumbdctl_open(mms,9709): OK s=00000000549539f0
session_init(mms,9709): OK. kdev=fc:1, len=6251159552 sect=512 s=00000000549539f0 pgrp=(9599).
snumbd_open_blk(systemd-udevd,48081): Disable access (1649,9599,9599)...
snumbdctl_release(mms,9709): OK s=00000000549539f0
snumbdctl_open(mms,9709): OK s=00000000549539f0
....
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:tuned           state:D stack:    0 pid: 3269 ppid:     1 flags:0x00000084
Call Trace:
 __schedule+0x2d1/0x870
 schedule+0x55/0xf0
 blk_mq_freeze_queue_wait+0x46/0xb0
 ? finish_wait+0x80/0x80
 elevator_switch+0x12/0x40
 elv_iosched_store+0x13c/0x1c0
 queue_attr_store+0x45/0x70
 kernfs_fop_write+0x11e/0x1a0
 vfs_write+0xa5/0x1b0
 ksys_write+0x4f/0xb0
 do_syscall_64+0x5b/0x1b0
 entry_SYSCALL_64_after_hwframe+0x61/0xc6

• System is in hang state with kernel ring buffer as below in RHEL 9 machine.

crash> log | tail
[3003949.506042] session_init(mms,1933): OK. kdev=fb:1, len=2048 sect=512 s=0000000059ae8a1b pgrp=(1440).
[3003949.507078] snumbd_open_blk(systemd-udevd,3159517): Disable access (646,1440,1440)...
[3003949.587719] snumbdctl_release(mms,1933): OK s=0000000059ae8a1b
[3003949.656815] snumbdctl_open(mms,1933): OK s=00000000ba84b471
[3003949.657125] session_init(mms,1933): OK. kdev=fb:1, len=2048 sect=512 s=00000000ba84b471 pgrp=(1440).
[3003949.657348] snumbd_open_blk(systemd-udevd,3159517): Disable access (646,1440,1440)...
[3003949.754683] snumbdctl_release(mms,1933): OK s=00000000ba84b471
[3003949.815066] snumbdctl_open(mms,1933): OK s=000000003ea6aa34
[3003949.815319] session_init(mms,1933): OK. kdev=fb:1, len=2048 sect=512 s=000000003ea6aa34 pgrp=(1440).