I checked my fstab, and my mount options for that partition are:
nodev,nosuid (so no discard).
As far as I remember, I had some issues converting from ext4 with
existing tools (I think that was on Debian so the tools were likely
older) so I did a manual conversion backup, wipe, copy files back).

$ sudo btrfs-find-root -o 3 /dev/sda4
Couldn't read tree root
Superblock thinks the generation is 311252
Superblock thinks the level is 0
ERROR: tree block bytenr 0 is not aligned to sectorsize 4096
Found tree root at 131072 gen 311252 level 0

On Fri, Aug 18, 2017 at 12:10 AM, Chris Murphy <li...@colorremedies.com> wrote:
> On Thu, Aug 17, 2017 at 4:42 PM, Qu Wenruo <quwenruo.bt...@gmx.com> wrote:
>
>> BTW are you using discard mount option? Sometimes it can cause problem.
>
> OP did not say if it was using discard mount option; but did say some
> time before this (I'm not sure how recent) he had used fstrim. The
> firmware for this SSD model is current.
>
>
> --
> Chris Murphy
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