Comment 10 for bug 1821625

Per [1] this symbol is present in: firejail, elogind, valgrind, glibc, musl, linux, systemd, strace, stress-ng, libseccomp, qemu

At least for qemu I checked and those are only references in the embedded linux headers. No rebuild needed for that, most of the others seem safe as well - maybe someone to look into stress-ng and strace. The one more improtant case might be libseccomp and as already identified systemd.

We had a recent upload of a newer seccomp [2] that was still built against 4.15.0-47.50.
@Dan did that already contain the fix you expect or would considering a seccomp be useful?

[1]: https://codesearch.debian.net/search?q=__NR_pkey_mprotect
[2]: https://launchpad.net/~ubuntu-security/+archive/ubuntu/ppa/+build/16742797