Failed merge, still running?

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So after a botched package update I decided to revert to the snapshot
I took just before doing the update. After shutting guest down, I
started

lvconvert --merge vmhost_vg0/desktop_snap_20200121

and instead of seeing the usual percentage of how far it has
completed, I got nothing. lvs -a -o +devices shows

  LV                      VG         Attr       LSize  Pool Origin
Data%  Meta%  Move Log Cpy%Sync Convert Devices
  desktop                 vmhost_vg0 Owi-a-s--- 20.00g
                                     /dev/sdb3(14848)
  [desktop_snap_20200121] vmhost_vg0 Swi-a-s--- 10.00g      desktop 100.00

I see nothing when I do lsof against both the lv (lsof
/dev/vmhost_vg0/desktop) and its snapshot. dmsetup tells me:

[root@vmhost ~]# dmsetup info /dev/vmhost_vg0/desktop
Name:              vmhost_vg0-desktop
State:             ACTIVE
Read Ahead:        256
Tables present:    LIVE
Open count:        0
Event number:      0
Major, minor:      253, 5
Number of targets: 1
UUID: LVM-qa4WnlE7w8V7pasHwdNH6bnpz2ajYY1F2ZXwTWzpUE2r6eE2DftMGLHdeATE8XAq

[root@vmhost ~]# dmsetup info /dev/vmhost_vg0/desktop_snap_20200121
Name:              vmhost_vg0-desktop_snap_20200121
State:             ACTIVE
Read Ahead:        256
Tables present:    LIVE
Open count:        0
Event number:      0
Major, minor:      253, 15
Number of targets: 1
UUID: LVM-qa4WnlE7w8V7pasHwdNH6bnpz2ajYY1FkyXcvv8ai1Sc0q5zlsXeenYOqCPUXs3M

[root@vmhost ~]#

Before I blow that lv up, what else should I be checking?


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