Created attachment 108371 [details] log of failure deleting a snapshot on a btrfs on "/" causes btrfs to go readonly. but deleting a snapshot on the same manually mounted btrfs works, because something happens differently: [ 36.487655] btrfs: creating UUID tree after that, btrfs is fixed, and deleting a snapshot from it on "/" works again. this means that no btrfs that got mounted from initramfs ro and remounted rw later will ever receive that above fix. of course i can reboot all my systems here using a usb stick and fix it that way or even do the fix in my initramfs, but it would be better to somehow fix it on remount,rw if possible, as everyone is doing the ro->remount,rw dance. Ahmet
[PATCH] Btrfs: create the uuid tree on remount rw fixes this, thanks! Ahmet