ext4 filesystem corruption with 4.10-rc2 on ppc64le

[Jens Axboe]

On 01/03/2017 10:18 PM, Anton Blanchard wrote:
> Hi,
> 
> I'm consistently seeing ext4 filesystem corruption using a mainline
> kernel. It doesn't take much to trigger it - download a ppc64le Ubuntu
> cloud image, boot it in KVM and run:
> 
> sudo apt-get update
> sudo apt-get dist-upgrade
> sudo reboot
> 
> And it never makes it back up, dying with rather severe filesystem
> corruption.
> 
> I've narrowed it down to:
> 
> 64e1c57fa474 ("ext4: Use clean_bdev_aliases() instead of iteration")
> e64855c6cfaa ("fs: Add helper to clean bdev aliases under a bh and use it")
> ce98321bf7d2 ("fs: Remove unmap_underlying_metadata")
> 
> Backing these patches out fixes the issue.

Fix is going out today, I see Chandan already pointed you at it. For the
other reporter, it's not an LE vs BE thing, it's a fs blocksize < page
size problem.

-- 
Jens Axboe