libzfs blowing up on pool with no features enabled
This is a strange one. It seems that check_status in usr/src/lib/libzfs/common/libzfs_status.c uses fnvlist_lookup_nvlist to get the "enabled_feat" list which is not always present. This causes anything using libzfs to core dump.
Interestingly ZoL made a change to this part of the code when MMP was introduced that makes this property optional: https://github.com/zfsonlinux/zfs/blob/master/lib/libzfs/libzfs_status.c#L385
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