I have reinstalled from scratch my system (for remote receiving of the 
snapshot).
Now it uses the 4.8.8-100.fc23.x86_64 kernel, and now I have a separate 
partition for '''possible dangerous''' test.

I do not remember the exact sequence that caused the corruption of the file 
system, but now it worked without problem.

If I have problems again, I will update the btrfs-tools and I will try to fix.

P.S The silent and unrecoverable corruption are not entirely friendly ( :) ).

Thank you for answer.

Gdb

I haven't seen this with 4.7.10. I suggest running 'btrfs check'
(without repair) using a recent btrfs-progs. You can find 4.8.3 in
koji, just download the appropriate rpm, and 'dnf update *rpm'

As for kernel, Fedora 23 has 4.8.8 in updates (stable) and 4.8.10 is
in updates-testing, I suggest moving to one of those.


Chris Murphy