Hi Dennis, Sorry to take so long about getting back to you. There was a bug in the btree library that I mistakenly thought was caused by my fix for your problem. Anyway, could you try and recreate your problem with these two patches applied please (patches are against v4.7-rc5 + my usual thin-dev extras): https://github.com/jthornber/linux-2.6/commit/ebdd99fc12acd0e9178831549896633171d5af1d https://github.com/jthornber/linux-2.6/commit/c05989b59d091270c2bf7dd05bdb7a3575223529 Thanks, - Joe -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel