[Bug 267644] FreeBSD guest running halt -p hangs on Linux client

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267644

            Bug ID: 267644
           Summary: FreeBSD guest running halt -p hangs on Linux client
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: andrew.cagney@gmail.com

Created attachment 237946
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=237946&action=edit
dmesg from VM

A pretty vanilla install into a qemu guest created using:

        sudo virt-install \
                --connect=qemu:///system --check=path_in_use=off
--graphics=none --virt-type=kvm --noreboot --console=pty,target_type=serial
--vcpus=1 --memory=2048  --cpu=host-passthrough
--network=network:swandefault,model=virtio --rng=type=random,device=/dev/random
--security=type=static,model=dac,label='1000:107',relabel=yes \
               
--filesystem=target=pool,type=mount,accessmode=squash,source=/home/pool \
                --name=w.freebsd-base \
                 --os-variant=freebsd13.0 \
               
--disk=path=/home/pool/w.freebsd-base.qcow2,size=10,bus=virtio,format=qcow2 \
                --cdrom=/home/pool/w.freebsd-base.iso

(the ISO is tweaked to help automate the install).  Afterwards:

[root@freebsd ~ 0]# halt -p
Nov  8 15:48:21 freebsd halt[779]: halted by root
Nov  8 15:48:21 freebsd syslogd: exiting on signal 15
Waiting (max 60 seconds) for system process `vnlru' to stop... done
Waiting (max 60 seconds) for system process `syncer' to stop... 
Syncing disks, vnodes remaining... 2 1 0 done
Waiting (max 60 seconds) for system thread `bufdaemon' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-0' to stop... done
All buffers synced.
Uptime: 37s
uhub0: detached
uhub1: detached

I'd have expected the vm to then quit (the whole shutdown process seems a
little slow).
I should note that using the host to ask the guest VM to shutdown does work
(for instance using virsh say).

I've tried it with hosts:

Linux 5.15.5-100.fc34.x86_64
qemu-kvm-5.2.0-8.fc34.x86_64

Linux 6.0.5-200.fc36.x86_64
qemu-kvm-6.2.0-16.fc36.x86_64

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