[Bug 168298] VirtualBox using AIO on a zvol crashes

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

datafl4sh at toxicnet.eu changed:

           What    |Removed                     |Added
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                 CC|                            |datafl4sh at toxicnet.eu

--- Comment #29 from datafl4sh at toxicnet.eu ---
I stumbled on this bug today for the first time, and it looks like that the
proposed patch does not have the intended effect.

I am on 11.4-RELEASE-p3, ports tree updated today. I compiled
emulators/virtualbox-ose-nox11 from source and fired up a virtual machine. As
soon as it tries to write something to disk, with 100% repeatability, the VM
freezes.

Here the relevant output in dmesg:

pid 3091 (VBoxHeadless) is attempting to use unsafe AIO requests - not logging
anymore

The VM has a single, zvol-backed disk.

-mc.

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