[Bug 269823] rand_harvest produces 100%CPU on 1 CPU with virtio_random.ko loaded

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 25 Feb 2023 11:34:01 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269823

            Bug ID: 269823
           Summary: rand_harvest produces 100%CPU on 1 CPU with
                    virtio_random.ko loaded
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@igalic.co

The fact that it reboots just fine, suggests that
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253175 is indeed fixed, but
some other underlying issue is not.

Here's `hotkernel`, until I can find something more useful:

Sampling... Hit Ctrl-C to end.
^C
FUNCTION                                                COUNT   PCNT
dtrace.ko`dtrace_dynvar_clean                               3   0.0%
kernel`0xffffffff81                                         4   0.0%
kernel`pagezero_erms                                        8   0.0%
kernel`hpet_get_timecount                                  18   0.0%
kernel`lock_delay                                          22   0.0%
kernel`spinlock_exit                                      575   0.9%
kernel`kobj_error_method                                  817   1.2%
kernel`virtqueue_poll                                   32208  48.8%
kernel`acpi_cpu_c1                                      32371  49.0%

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