"I'm not willing to merge something where the maintainer is known to not care about bugs and regressions and then forces people in other projects to fix their project."
1. A system hang due an assertion in journald spamming kmsg.
2. The question of whether systemd should be logging to kmsg or doing anything based on the "debug" kernel command line argument.
Linus got pissed because, based on Steven Rostedt's post to LKML and the referenced bug report, it looked like Kay was refusing to fix issue #1, but that bug had already been addressed and a fix committed to systemd. In the aftermath there was also a flamewar over issue #2, which is what Lennart is responding to in that G+ post.
I mean rate limiting stuff that comes from anywhere is needed. not cause of the fact that systemd does it. I mean if I could write a userspace tool that crashes the kernel.. is somewhat aweful.