>Number: 168298
>Category: kern
>Synopsis: VirtualBox using AIO on a zvol crashes
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu May 24 10:50:03 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator: Pete French
>Release: FreeBSD 8.3-STABLE amd64
>Organization:
Ingresso Group Ltd
>Environment:
System: FreeBSD dilbert.london-internal.ingresso.co.uk 8.3-STABLE FreeBSD
8.3-STABLE #0: Sun May 6 14:15:46 BST 2012
[email protected]:/usr/obj/usr/src/sys/GENERIC
amd64
virtualbox-ose-kmod-4.1.14
>Description:
With AIO loaded ViryialBox will use this to access files. Running
VirtualBox on to of a zvol as the raw disc crashes. This may be a bug
in zvol+aio, hence the classification above. VirtualBox prduces an
error message in it's logs about AIO before crashing.
>How-To-Repeat:
Running VirtualBox over a zvol with AIO and then doing heavy
disc write activity will provoke the problem in a few minutes. I made
a posting to stable regarding this here:
http://lists.freebsd.org/pipermail/freebsd-stable/2012-May/067648.html
The zvol has compression enabled.
>Fix:
Do not load the AIO kernel module. VirtualBox is stable if AIO
is not being used.
>Release-Note:
>Audit-Trail:
>Unformatted:
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