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This is a broken state which Longhorn cannot recover. You might already have data loss. You can forcefully remove them by: 1. Find the location of

snapshot.img

file 2. Inside that directory, there are

*.meta

files which contains the information about the parent snapshot 3. Note them down to form a snapshot chain. Then manually edit them to remove the reference to the target

<snapshot.img>

Are you having backup for this volume? It might be simpler to restore this volume from backup