[Bug 253175] virtio_random(4): Hangs after shutdown, reboot, halt commands on Vultr / Hetzner / ARP Networks (Qemu)

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 16 Mar 2022 04:53:27 UTC

--- Comment #37 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:


commit adbf7727b3a2aad3c2faa6e543ee7fa7a6c9a3d5
Author:     Eugene Grosbein <eugen@FreeBSD.org>
AuthorDate: 2022-03-16 04:41:51 +0000
Commit:     Eugene Grosbein <eugen@FreeBSD.org>
CommitDate: 2022-03-16 04:41:51 +0000

    virtio_random(8): avoid deadlock at shutdown time

    FreeBSD 13+ running as virtual guest may load virtio_random(8) driver
    by means of devd(8) unless the driver is blacklisted or disabled
    via device.hints(5). Currently, the driver may prevent
    the system from rebooting or shutting down correctly.

    This change deactivates virtio_random at very late stage
    during system shutdown sequence to avoid deadlock
    that results in kernel hang.

    PR:             253175
    Tested by:      tom
    MFC after:      3 days

 sys/dev/virtio/random/virtio_random.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

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