Hi, How to reproduce: lvcreate -L30G -n testsnap vg1 # of course substitute VG as appropriate dd if=/dev/zero of=/dev/vg1/testsnap bs=2M # to make things clear lvcreate -L15G -s /dev/vg1/test -n testsnap dd if=/dev/zero of=/dev/vg1/testsnap bs=2M & watch free I noticed roughly 1GB memory vanishing from free / -/+ buffers/cache per 2GB copied. Bisecting yielded a6e50b409d3f9e0833e69c3c9cca822e8fa4adbb, reverting that from git master cures the memory leak -- MfG, Michael Leun -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel