https://www.theregister.co.uk/2018/01/28/linux_4_15_debuts/

‘This was not a pleasant release cycle’ says Linux overlord, who prefers things boring, ‘Because boring really is good’

Linus Torvalds has hit the Go button for version 4.15 of the Linux kernel, blamed the Meltdown and Spectre CPU design flaws for the delay and warned of more pain to come as fixes trickle out for silicon architectures.