On Tue, 10 Apr 2018 a bug that doesn't want repl...@freebsd.org wrote:

--- Comment #1 from Dexuan Cui <de...@microsoft.com> ---
When the issue happens, the cpu utilization of the UP VM is 100%.

While we're trying to find the first bad revision, it would be great if
somebody can report if the issue also happens to bare metal or other

This has been happening for at least several months on real hardware too.
SMP kernels hang on a 1-CPU system and on an 8-CPU systems with all except
1 CPU turned off in the BIOS.  They don't hang on the 8-CPU system with at
least 2 CPUs turned on.  UP kernels don't hang.  I use SCHED_4BSD.
SCHED_ULE is apparently not much different for this.

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