I realize this report is practically useless, but better out than in
(according to Shrek).
I found this in the logs of my GCE VM running syzkaller bot. No further
details were preserved...

2018/11/24 09:53:48 ci-openbsd-main: poll:
94bf4886dbb69e9fbf0f92f975fc23f16fc5c80f
2018/11/24 09:53:48 ci-openbsd-main: building kernel...
2018/11/24 09:54:03 ci-openbsd-main: testing image...
2018/11/24 10:04:07 ci-openbsd-main: VM boot failed with: panic: pvclock0:
unstable result on stable clock

The host is running
OpenBSD 6.4-current (GENERIC.MP) #456: Tue Nov 20 08:46:59 MST 2018
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP

The VM kernel at the time was built at "zap 10 tab leading whitespace
before 'struct evp_pkey_ctx_st {'", so maybe "only attach pvclock(4) inside
a KVM guest" would've fixed it?

Thanks
Greg

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