D57614.diff
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	diff --git a/sys/x86/cpufreq/est.c b/sys/x86/cpufreq/est.c
	--- a/sys/x86/cpufreq/est.c
	+++ b/sys/x86/cpufreq/est.c
	@@ -1181,11 +1181,15 @@
	/* Figure out the bus clock. */
	freq = atomic_load_acq_64(&tsc_freq) / 1000000;
	id = msr >> 32;
	+ if ((id >> 8) == 0)
	+ return (EOPNOTSUPP);
	bus = freq / (id >> 8);
	device_printf(dev, "Guessed bus clock (high) of %d MHz\n", bus);
	if (!bus_speed_ok(bus)) {
	/* We may be running on the low frequency. */
	id = msr >> 48;
	+ if ((id >> 8) == 0)
	+ return (EOPNOTSUPP);
	bus = freq / (id >> 8);
	device_printf(dev, "Guessed bus clock (low) of %d MHz\n", bus);
	if (!bus_speed_ok(bus))