qemu coredumps on RELENG_7

[Kostik Belousov]

On Mon, Mar 17, 2008 at 09:47:58AM +0100, Oliver Fromme wrote:
> Sorry for replying to myself ...
> 
> Oliver Fromme wrote:
>  > I'm trying to use the 7.0-RELEASE (i386) ISO in qemu
>  > on a RELENG_7 host (i386, too) from March 5th.
>  > It always coredumps with "invalid system call"
>  > shortly before starting sysinstall, unless I boot
>  > with "safe mode" from the loader menu _or_ without
>  > a vortual harddisk attached to qemu.
> 
> "virtual harddisk", of course.  :-)
> 
> Anyway, further examination seems to indicate that the
> problem is related to harddisk DMA.  Is there a known
> problem with it on FreeBSD with qemu?
> 
> Unfortunately, using PIO for the harddisk (in order to
> avoid qemu crashing) makes the emulated system very
> slow, so it's unusable for any production work.

Definitely,
kldload aio
before running qemu.
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