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0e1f616
(Get the code!)
You need to improve your bug reporting skills:-)
Exactly what userspace commands did you run with exactly what options? What is the architecture? (Arch & chunksize interact.)
You also need to say what userspace versions of lvm2 & device-mapper you are using - it's not necessarily a kernel bug.
There have been a lot of fixes to kernel device-mapper, including snapshots, since 2.6.15. So test against the latest upstream kernel and userspace packages if you can and see whether or not the problem has already been fixed there.