This seems to be slides from a recent OpenBSD meetup where they were discussing the implementation of syzkaller[1], an open source tool from Google written in Go, to fuzz C kernels.

Then it lists 9 issues found in the OpenBSD kernel, including two[2][3] issues with kqueue.

Pretty cool stuff!

[1] https://github.com/google/syzkaller

[2] https://marc.info/?l=openbsd-cvs&m=153364550327224&w=2

[3] https://marc.info/?l=openbsd-cvs&m=152930020005260&w=2