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FreeBSD 11.4 serves kern.boottime ({CTL_KERN, KERN_BOOTTIME}) from
sysctl_kern_boottime in sys/kern/kern_tc.c as a read-only 16-byte struct
timeval, so a size query reports 16, a short buffer gets a partial copy
and ENOMEM, and a write gets EPERM from sysctl_root. sysctl, sysctlbyname
and sysctlnametomib now answer it with the guest CLOCK_REALTIME minus
CLOCK_UPTIME, taken at the first read and kept. HotSpot reads it while
writing its error report, which aborted with "unsupported MIB 1.21".