I found a solution to "fix" the bug. We are using a xfs filesystem in the logical volumes. The script we used to test made an xfs_freeze just before snapshotting. This caused an race condition in the kernel, because it tries to make a freeze while creating the snapshot. Without doing xfs_freeze everything works almost well. The bug is IMHO somewhere between xfs and snapshots inside the kernel. This is not critical but should be fixed.
Regards Stephan Wienczny
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