https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261538
--- Comment #2 from John F. Carr <j...@mit.edu> --- Created attachment 232017 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=232017&action=edit disable blk_birth assertion I most likely have the problem from https://github.com/openzfs/zfs/issues/11480, the combination of deduplication and cloning can generate blocks with identical DVA_GET_OFFSET but different blk_birth. The assertion that failed is not valid on pools with deduplication, like my system. Disabling the failing assertion allows deleting the pools that could not be deleted before. -- You are receiving this mail because: You are the assignee for the bug.