[Bug 238095] Current console input freezes in hyperv gen 2 VM after randon amount of time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238095

--- Comment #15 from Michael <michael.adm at gmail.com> ---
Faced an interesting moment. I install from the iso-image from 2019-12-05.
FreeBSD-13.0-CURRENT-amd64-20191205-r355406-disc1.iso
When loading an already working system at the time of the countdown of 10
seconds of the boot selection option, press Enter and get a completely freezing
system. If we do not touch anything (a countdown of 10 seconds occurs), the
system boots and works.
Made a complete system update.
make buildworld && make buildkernel KERNCONF=GENERIC
make installkernel KERNCONF=GENERIC
make installworld
mergemaster -Ui
reboot
...the same - at the time of the countdown of 10 seconds of the boot selection
option, press Enter and get a completely freezing system. If we do not touch
anything (a countdown of 10 seconds occurs), the system boots and works.
ok.
mount -t msdosfs /dev/da0p1 /mnt
cp /boot/loader.efi /mnt/EFI/freebsd
reboot
at the time of the countdown of 10 seconds of the boot selection option, press
Enter and system boots normal, as it shuld.
Could these spontaneous keyboard disappearances in running multiprocessor
virtual machines be due to this?
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240734

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