Created attachment 806382 [details]
dmesg output

The btrfs file system on the system disk suddenly got damaged. The reason is
unknown. Subsequent attempts to reboot and mount led to messages in the system
log: 
kernel BUG at fs/btrfs/ctree.h:3524!
Using a recent rescue disk didn't really help. I attached the output of dmesg.
I was trying to mount the disk using the tumbleweed rescue disk. 'btrfs scrub'
was not helpful. I can mount the file system on the disk, but I can't do
anything useful with it. All operations seem to block.

Any ideas what I could do with this file system are welcome