qemu coredumps on RELENG_7

[D Hill]

On Mon, 17 Mar 2008 at 08:36 -0600, rick-freebsd at kiwi-computer.com confabulated:

> On Mon, Mar 17, 2008 at 02:46:51PM +0100, Oliver Fromme wrote:
>>
>> Kostik Belousov wrote:
>> >
>> > Definitely,
>> > kldload aio
>> > before running qemu.
>>
>> Thank you, that seems to solve the problem indeed.
>> Is that documented somewhere?  It's not in the manpage.
>> I think it should be in the manpage ...  would have
>> saved me quite some time.
>
> Nope.  It should be, or at least qemu should fail to start or at least
> print a message instead of just randomly failing.
>
> I ran into the same problem and only after spending hours trying to get it
> to work did I remember to kldload aio.

I don't know if this applies. However, I found this in 
/usr/ports/UPDATING:

20070206:
   AFFECTS: users of emulators/qemu
   AUTHOR: nox at FreeBSD.org

   qemu now uses aio at least for ide dma, so if you get
   "Invalid system call" crashes that is because aio is not (kld)loaded.

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