Security researcher and MateSSL founder, Andrew Ayer has uncovered a bug [agwa.name] which will either crash or make systemd unstable (depending on who you talk to) on pretty much every linux distro. David Strauss posted a highly critical response [medium.com] to Ayer. In true pedantic nerd-fight fashion there is a bit of back and forth between them over the "true" severity of the issue and what not.
Nerd fights aside, how you feel about this bug, will probably largely depend on how you feel about systemd in general.