GPT corruption with more than one partition
|Reported by:||kallisti5||Owned by:||jessicah|
Creating a few partitions (more than 1) will result in GPT corruption per gdisk. For example below, create 8 partitions on one disk, then read that disk with gdisk.
$ gdisk test.raw GPT fdisk (gdisk) version 0.8.10 Caution! After loading partitions, the CRC doesn't check out! Warning! Main and backup partition tables differ! Use the 'c' and 'e' options on the recovery & transformation menu to examine the two tables. Warning! One or more CRCs don't match. You should repair the disk! Partition table scan: MBR: not present BSD: not present APM: not present GPT: damaged Found invalid MBR and corrupt GPT. What do you want to do? (Using the GPT MAY permit recovery of GPT data.) 1 - Use current GPT 2 - Create blank GPT Your answer: 1 Command (? for help): p Disk test.raw: 204800 sectors, 100.0 MiB Logical sector size: 512 bytes Disk identifier (GUID): 82009838-FFFF-FFFF-3898-0082FFFFFFFF Partition table holds up to 128 entries First usable sector is 34, last usable sector is 204766 Partitions will be aligned on 8-sector boundaries Total free space is 90045 sectors (44.0 MiB) Number Start (sector) End (sector) Size Code Name 1 49192 65575 8.0 MiB A501 5 49192 65575 8.0 MiB A501 6 65576 81959 8.0 MiB A581 7 81960 98343 8.0 MiB A902 8 98344 114727 8.0 MiB A901 9 40 16423 8.0 MiB EB00 10 16424 32807 8.0 MiB 8300 11 32808 49191 8.0 MiB AB00 12 49192 65575 8.0 MiB A501 Command (? for help): v Problem: The CRC for the main partition table is invalid. This table may be corrupt. Consider loading the backup partition table ('c' on the recovery & transformation menu). This report may be a false alarm if you've already corrected other problems. Caution: The CRC for the backup partition table is invalid. This table may be corrupt. This program will automatically create a new backup partition table when you save your partitions. Problem: partitions 5 and 1 overlap: Partition 5: 49192 to 65575 Partition 1: 49192 to 65575 Problem: partitions 12 and 1 overlap: Partition 12: 49192 to 65575 Partition 1: 49192 to 65575 Problem: partitions 12 and 5 overlap: Partition 12: 49192 to 65575 Partition 5: 49192 to 65575 Identified 5 problems! Command (? for help):
Given the "65575" it looks like there is some overflow somewhere. Our GPT code places partitions on-top of each other :-\