https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218715

            Bug ID: 218715
           Summary: e1000 emulation in bhyve will lock up under Windows
                    guests
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Keywords: bhyve
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-virtualization@FreeBSD.org
          Reporter: gre...@freebsd.org

When using the e1000 emulation in bhyve with Windows guests, it's possible to
get a lockup where a single vCPU spins at 100%.

This can be reproduced within 10 minutes or so by running iperf3 on Windows to
the host. In normal use, the lockup can take hours or even weeks, but seems to
eventually occur.

A workaround is to use the virtio network drivers on Windows with the
virtio-net emulation on bhyve.

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