[Bug 168298] VirtualBox using AIO on a zvol crashes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=168298

rkoberman at gmail.com changed:

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                 CC|                            |rkoberman at gmail.com

--- Comment #5 from rkoberman at gmail.com ---
Just for the record, this is not ZFS related. The same issue shows up with VB
and UFS. I am running 11 where AIO is integrated into the kernel, so I'll try
the tuning advice and see what happens.

In my case it produced several crashes in my Window 7 client while suspending
the VM and many hangs of the VM. Worst case was when the virtual disk required
a disk check which, in turn hung repeatedly, though eventually it did complete
and the system is running again.

Can AIO be disabled? I was looking at kern.features.aio.

virtualbox-ose-5.0.26_1
FreeBSD rogue 11.0-BETA4 FreeBSD 11.0-BETA4 #1 r303806: Sat Aug  6 18:50:50 PDT
2016     root at rogue:/usr/obj/usr/src/sys/GENERIC.4BSD  amd64

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