On 2019/7/12 下午7:05, mangoblues@gmail.com wrote:
> Hi,
> 
> After updating to kernel 5.2 (archlinux):  2 out of my 7 btrfs drives
> fail to mount on boot.
> 
> Error: can't read superblock on /dev/sdb1 and /dev/sdc1.

Pull dmesg output please.

Thanks,
Qu

> 
> Going back to kernel 5.1.16 (and 4.19 also) fixes the problem. Btrfsck
> reports the 2 drives are OK.
> 
> What can I do to fix this ?
> 
> Thanks.
> 
> $ btrfs fi show
> 
> Label: 'disk3'  uuid: 37d68257-a2bf-44e4-82e6-7bda35d3af3c
>         Total devices 1 FS bytes used 1.77TiB
>         devid    1 size 1.82TiB used 1.82TiB path /dev/sdb1
> 
> Label: 'disk4'  uuid: 8b72d7bd-603c-41c0-a395-a763ffe0de8b
>         Total devices 1 FS bytes used 2.67TiB
>         devid    1 size 2.73TiB used 2.73TiB path /dev/sdc1
> 
> Label: 'disk5'  uuid: 1728d60b-bdf2-4baa-8372-de7014d85e1d
>         Total devices 1 FS bytes used 3.59TiB
>         devid    1 size 3.64TiB used 3.64TiB path /dev/sdg1
> 
> Label: 'disk7'  uuid: 5e9437b5-bf53-4135-8b25-52539cfc491e
>         Total devices 1 FS bytes used 6.66TiB
>         devid    1 size 7.28TiB used 7.23TiB path /dev/sde1
> 
> Label: 'disk6'  uuid: ce325155-0922-4c62-9f5d-70cbc1726b5c
>         Total devices 1 FS bytes used 3.47TiB
>         devid    1 size 3.64TiB used 3.63TiB path /dev/sdd1
> 
> Label: 'disk1'  uuid: b9c65214-b1dc-4a97-b798-dc9639177880
>         Total devices 1 FS bytes used 3.31TiB
>         devid    1 size 3.64TiB used 3.62TiB path /dev/sdh1
> 
> Label: 'disk2'  uuid: d77e4116-de32-4ff4-938c-9c6eea6cdd42
>         Total devices 1 FS bytes used 6.83TiB
>         devid    1 size 7.28TiB used 7.26TiB path /dev/sdf1
>