Doing an "sfdisk -l" will try to open partitions as if they were disks, and fail to read the partition table. Patch attached. It makes use of the same is_probably_full_disk() as fdisk.
Created attachment 127554 [details] util-linux-sfdisk-dont-open-partitions.patch
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2006-0456.html