Re: [PATCH -next] block: don't allow a disk link holder to its ancestor

[Chaitanya Kulkarni]

Li,

On 4/25/23 00:55, Li Lingfeng wrote:
> From: Li Lingfeng <lilingfeng3@xxxxxxxxxx>
>
> Previously commit 077a4033541f ("block: don't allow a disk link holder
> to itself") prevent user from reloading dm with itself. However, user
> can reload dm with its ancestor which will trigger dead loop and result
> in oom.
>
> Test procedures:
> 1) dmsetup create test --table "0 20971520 linear /dev/sdd 0"
> 2) dmsetup create test1 --table "0 20971520 linear /dev/sdd 20971520"
> 3) dmsetup suspend test
> 4) dmsetup reload test --table "0 2048 linear /dev/mapper/test1 0"
> 5) dmsetup resume test
> 6) dmsetup suspend test1
> 7) dmsetup reload test1 --table "0 2048 linear /dev/mapper/test 0"
> 8) dmsetup resume test1
>

Can you please add blktest for this one ?

-ck