The f2fs implementation in the Linux kernel before 4.14 mishandles reference counts associated with f2fs_wait_discard_bios calls, which allows local users to cause a denial of service (BUG), as demonstrated by fstrim.Referenceshttps://github.com/torvalds/linux/commit/638164a2718f337ea224b747cf5977ef143166a4http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=638164a2718f337ea224b747cf5977ef143166a4
