regression -current with kernels 5.14.0/1 and lvm2

system: slackware 32bit -current

Code:lsblk:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 931.5G 0 disk
sda1 8:1 0 200M 0 part /boot
sda2 8:2 0 931.3G 0 part
slacklvm-root 253:0 0 50G 0 lvm /
slacklvm-swap 253:1 0 4G 0 lvm
slacklvm-home 253:2 0 500G 0 lvm /home
sr0 11:0 1 1024M 0 rom
zram0 252:0 0 2G 0 disk [SWAP]On shutdown or reboot system hangs at:
Code:Unmounting local filesystems:
...
Remounting root filesystem read-only:
mount: /dev/mapper/slacklvm-root mounted on /.
Deactivating LVM volume groups:
Logical volume slacklvm/root contains a filesystem in use.
Can't deactivate volume group "slacklvm" with 1 open logical volume(s)While the message (not sure if exactly the same) has always appeared, the machine has nevertheless gone on to either reboot or shutdown. The machine now simply hangs requiring either an alt+sysreq or hard shutdown.

It may of course be something other than the recent kernels causing this; however, the kernels are the closest I can narrow down to.

Thanks.