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Date:      Tue, 22 Feb 2022 07:49:32 +0000
From:      bugzilla-noreply@freebsd.org
To:        virtualization@FreeBSD.org
Subject:   [Bug 262113] bhyve fails every other attempt to run
Message-ID:  <bug-262113-27103-fsFAgoR2Sc@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-262113-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-262113-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D262113

Aleksandr Fedorov <afedorov@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |afedorov@FreeBSD.org

--- Comment #1 from Aleksandr Fedorov <afedorov@FreeBSD.org> ---
The main problem is that the VM is destroyed asynchronously via sysctl:
https://github.com/freebsd/freebsd-src/blob/main/usr.sbin/bhyvectl/bhyvectl=
.c#L2397
https://github.com/freebsd/freebsd-src/blob/main/lib/libvmmapi/vmmapi.c#L88
https://github.com/freebsd/freebsd-src/blob/main/sys/amd64/vmm/vmm_dev.c#L1=
080

Therefore, bhyvectl --destroy --vm=3Dtest0 completes before the VM is actua=
lly
destroyed.

Moreover, even the /dev/vmm/test0 device is removed before the actual
destruction of the VM occurs.

And I don't know of a guaranteed way to check if a VM is destroyed from
userspace.

As workaround you can use:
bhyvectl --destroy --vm=3Dtest0
sleep [N[
bhyve -AHP -c 1 -m 1024M ...


But this is not a 100% reliable solution.

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