In the Linux kernel 5.3.11, mounting a crafted btrfs image twice can cause an rwsem_down_write_slowpath use-after-free because (in rwsem_can_spin_on_owner in kernel/locking/rwsem.c) rwsem_owner_flags returns an already freed pointer, CREATE(Triage):(User=admin) [CVE-2019-19318|https://nvd.nist.gov/vuln/detail/CVE-2019-19318]
