The madvise_willneed function in mm/madvise.c in the Linux kernel before 4.14.4 allows local users to cause a denial of service (infinite loop) by triggering use of MADVISE_WILLNEED for a DAX mapping.
https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.4
https://usn.ubuntu.com/3657-1/
https://usn.ubuntu.com/3655-2/
https://usn.ubuntu.com/3655-1/
https://usn.ubuntu.com/3653-2/
https://usn.ubuntu.com/3653-1/
https://usn.ubuntu.com/3619-2/
https://usn.ubuntu.com/3619-1/
https://github.com/torvalds/linux/commit/6ea8d958a2c95a1d514015d4e29ba21a8c0a1a91
https://access.redhat.com/errata/RHSA-2019:4058
https://access.redhat.com/errata/RHSA-2019:4057
https://access.redhat.com/errata/RHSA-2019:3967
https://access.redhat.com/errata/RHSA-2018:3096
https://access.redhat.com/errata/RHSA-2018:3083