I tried to replace the "new generated" initrd with the initrd that worked until 19th of May (before the filesystem got full) (as, as far as I know I have the same disk geometry and hardware like before) I have the same issue. So something happened to the fileystem?!?! I tried to examine the filesystem from the rescue disk and everithing seems fine, I can access everywhere and every subvolume. Please, as I have the system completely down, before reinstall all (fortunately I have backup) someone can address me the debugging that could be helpful also for other users?