Fail to register logical partition because it overlaps with the extended partition

[Victor BERTIN <vbertin@witekio.com>]

Hello All,

We are using Barebox v2022.12.0 on a MSC SM2S-IMX8MP SoM.

We witness an error happening when registering the first logical partition of our extended partition :
ERROR: New partition mmc2.4 (0x46600400-0xc68003ff) on mmc2 overlaps with partition mmc2.3 (0x46600200-0x466005ff), not creating it
ERROR: mmc2: Failed to register partition 4 on mmc2 (-22)

However, Linux does not complain and all partitions are properly registered :
[root@imx8-evo:~]# lsblk
NAME         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
mmcblk2      179:0    0 14.6G  0 disk
|-mmcblk2p1  179:1    0   66M  0 part
|-mmcblk2p2  179:2    0    1G  0 part /
|-mmcblk2p3  179:3    0   34M  0 part /rwdisk/systemrw
|-mmcblk2p4  179:4    0    1K  0 part
|-mmcblk2p5  179:5    0    2G  0 part /rwdisk/app
|-mmcblk2p6  179:6    0  130M  0 part /var/log
`-mmcblk2p7  179:7    0   32M  0 part /rwdisk/conf
mmcblk2boot0 179:32   0    4M  1 disk
mmcblk2boot1 179:64   0    4M  1 disk

Since 84ea37e4580cabc2a49edc4e2c62b45a752771fc, extended partitions are registered with a size of 2 sectors. Our extended partition still manages to overlap with the first logical partition that it contains.
A simple trick is to reduce the registration size to 1 sector, however we are not sure of the side effects of such change.

Any idea why such issue could happen ?

Thanks in advance for your help,

Victor Bertin

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