[Bug 254058] zfs doesn't set mnt_time aka RootOnZFS doesn't work without RTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254058

Vincent Milum Jr <[email protected]> changed:

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--- Comment #2 from Vincent Milum Jr <[email protected]> ---
Just as an update: this bug still exists in all current FreeBSD branches.

I've actively hit this bug during the development of Stratipi, but was unaware
of this particular bug report, so I ended up making my own work-around for it.

This is specific to my deployment, since it is for ensuring Chrony initializes
correctly:

https://github.com/circuitrewind/stratipi/blob/main/stratipi/usr/local/etc/rc.d/save_time

So this issue isn't just annoying, it is actively a problem when using Chrony
instead of ntpd. Chrony has a hard cap of ~50 years prior to compile time that
it'll allow the system clock to jump from. Here in 2026, that means the
earliest supported clock it can jump from is ~1976, 6 years after the default
1970 UNIX Epoch. Even with active upstream NTP servers, and even with a GPS
clock source, Chrony will refuse to jump the system clock on such a large gap.

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