Re: [GIT PULL] x86 fixes

Andy Lutomirski
2015-08-17T23:59:39Z

On Mon, Aug 17, 2015 at 1:01 AM, Ingo Molnar <mingo@kernel.org> wrote:
> So when I re-introduced static allocations math-emu started working again, to a
> limited degree: on a modern distro, trying to boot /bin/bash I got a prompt, but
> various programs would segfault. I did not investigate it any deeper, I suppose
> the FPU emulation does not go far enough for modern user-space, or maybe it has
> more bugs.
>

Were you testing with just no387 or did you run a VM with SSE2 and
such turned off?

There's a *lot* of userspace that incorrectly checks for instructions
without checking for the state support. I've filed bugs against
libgcc for this and they're still not fixed IIRC.

--Andy