On Tue, 2019-02-12 at 14:31 +0200, Artem Mygaiev wrote:
> Have same issue (RAID5 over 4 disks):
> https://marc.info/?l=linux-btrfs&m=154815802313248&w=2
> 
> Having perfectly healthy HDDs it seem to be caused by some bit flips
> in SDRAM which is non-ECC in my case, unfortunately. Tried --repair,
> didn't helped, same for --init-csum-tree. Now using fs in ro mode
> (data is fully available), preparing for total rebuild.
> 
>  -- Artem
> 

Thanks for sharing your misadventure. I'm a step ahead from you, as this issue
is on my rebuilt btrfs filesystem. 😎

What make you think it could be RAM bit flips?

Regards,

Sébastien "Seblu" Luttringer