Arm + KASAN + syzbot

[Linus Walleij]

On Tue, Jan 19, 2021 at 11:23 AM Dmitry Vyukov <dvyukov at google.com> wrote:
> On Tue, Jan 19, 2021 at 11:17 AM Linus Walleij <linus.walleij at linaro.org> wrote:
> > > > You could also try other QEMU machine (I don't know many of them, some
> > > > time ago I was using exynos defconfig on smdkc210, but without KASAN).
> > >
> > > vexpress-a15 seems to be the most widely used and more maintained. It
> > > works without KASAN. Is there a reason to switch to something else?
> >
> > Vexpress A15 is as good as any.
> >
> > It can however be compiled in two different ways depending on whether
> > you use LPAE or not, and the defconfig does not use LPAE.
> > By setting CONFIG_ARM_LPAE you more or less activate a totally
> > different MMU on the same machine, and those are the two
> > MMUs used by ARM32 systems, so I would test these two.
> >
> > The other interesting Qemu target that is and was used a lot is
> > Versatile, versatile_defconfig. This is an older ARMv5 (ARM926EJ-S)
> > CPU core with less memory, but the MMU should be behaving the same
> > as vanilla Vexpress.
>
> That's interesting. If we have more than 1 instance in future we could
> vary different aspects between them to get more combined coverage.
> E.g. one could use ARM_LPAE=y while another ARM_LPAE=n.
>
> But let's start with 1 instance running first :)

Hm I noticed that I was running in LPAE mode by default on Vexpress
so I try non-LPAE now. Let's see what happens...

Linus