On Mon, 22 Mar 2021 at 16:36, John Garry wrote:
>
> >>
> >> There's apparently a bit in the PCI spec that reads:
> >> The host bus bridge, in PC compatible systems, must return all
> >> 1's on a read transaction and discard data on a write transaction
> >> when terminate
There's apparently a bit in the PCI spec that reads:
The host bus bridge, in PC compatible systems, must return all
1's on a read transaction and discard data on a write transaction
when terminated with Master-Abort.
which obviously applies only to "PC compatible syste
On Mon, Mar 22, 2021 at 2:53 PM Peter Maydell wrote:
> On Sun, 21 Mar 2021 at 19:00, Arnd Bergmann wrote:
> > On Sat, Mar 20, 2021 at 9:43 PM Peter Maydell
> > wrote:
> > > On Fri, 12 Mar 2021 at 09:16, Arnd Bergmann wrote:
> > > > So it's probably qemu that triggers the 'synchronous external
On Sun, 21 Mar 2021 at 19:00, Arnd Bergmann wrote:
>
> On Sat, Mar 20, 2021 at 9:43 PM Peter Maydell
> wrote:
> >
> > On Fri, 12 Mar 2021 at 09:16, Arnd Bergmann wrote:
> > > So it's probably qemu that triggers the 'synchronous external
> > > abort' when accessing the PCI I/O space, which in tu
On Sat, Mar 20, 2021 at 9:43 PM Peter Maydell wrote:
>
> On Fri, 12 Mar 2021 at 09:16, Arnd Bergmann wrote:
> > So it's probably qemu that triggers the 'synchronous external
> > abort' when accessing the PCI I/O space, which in turn hints
> > towards a bug in qemu. Presumably it only returns data
On Sun, Mar 21, 2021 at 12:52 PM Arnd Bergmann wrote:
> On Sat, Mar 20, 2021 at 9:43 PM Peter Maydell
> wrote:
> https://tldp.org/HOWTO/Plug-and-Play-HOWTO-6.html#ss6.12
> states the behavior of the ISA I/O ports and how Linux drivers rely
> on that. Is that enough for you?
Actually it only me
On Sat, Mar 20, 2021 at 9:43 PM Peter Maydell wrote:
>
> On Fri, 12 Mar 2021 at 09:16, Arnd Bergmann wrote:
> > So it's probably qemu that triggers the 'synchronous external
> > abort' when accessing the PCI I/O space, which in turn hints
> > towards a bug in qemu. Presumably it only returns data
On Fri, 12 Mar 2021 at 09:16, Arnd Bergmann wrote:
> So it's probably qemu that triggers the 'synchronous external
> abort' when accessing the PCI I/O space, which in turn hints
> towards a bug in qemu. Presumably it only returns data from
> I/O ports that are actually mapped to a device when real
On Wed, Mar 17, 2021 at 7:45 PM Mark Rutland wrote:
>
> On Thu, Mar 11, 2021 at 05:56:46PM +0100, Dmitry Vyukov wrote:
> > On Thu, Mar 11, 2021 at 1:33 PM Mark Rutland wrote:
> > > FWIW, I keep my fuzzing config fragment in my fuzzing/* branches on
> > > git.kernel.org, and for comparison my frag
On Thu, Mar 11, 2021 at 05:56:46PM +0100, Dmitry Vyukov wrote:
> On Thu, Mar 11, 2021 at 1:33 PM Mark Rutland wrote:
> > FWIW, I keep my fuzzing config fragment in my fuzzing/* branches on
> > git.kernel.org, and for comparison my fragment for v5.12-rc1 is:
> >
> > https://git.kernel.org/pub/scm/l
On Mon, Mar 15, 2021 at 11:29 AM John Garry wrote:
> On 15/03/2021 10:01, Dmitry Vyukov wrote:
> > On Mon, Mar 15, 2021 at 10:45 AM John Garry wrote:
> It does not happen too often on syzbot so far, so let's try to do the
> right thing first.
> I've filed:https://bugs.launchpad.net
On Mon, Mar 15, 2021 at 11:31 AM John Garry wrote:
>
> On 15/03/2021 10:01, Dmitry Vyukov wrote:
> > On Mon, Mar 15, 2021 at 10:45 AM John Garry wrote:
> It does not happen too often on syzbot so far, so let's try to do the
> right thing first.
> I've filed:https://bugs.launchpad.n
On 15/03/2021 10:01, Dmitry Vyukov wrote:
On Mon, Mar 15, 2021 at 10:45 AM John Garry wrote:
It does not happen too often on syzbot so far, so let's try to do the
right thing first.
I've filed:https://bugs.launchpad.net/qemu/+bug/1918917
with a link to this thread. To be fair, I don't fully und
On Mon, Mar 15, 2021 at 10:45 AM John Garry wrote:
> >> It does not happen too often on syzbot so far, so let's try to do the
> >> right thing first.
> >> I've filed: https://bugs.launchpad.net/qemu/+bug/1918917
> >> with a link to this thread. To be fair, I don't fully understand what
> >> I am t
On 12/03/2021 10:52, Arnd Bergmann wrote:
On Fri, Mar 12, 2021 at 11:38 AM Dmitry Vyukov wrote:
On Fri, Mar 12, 2021 at 11:11 AM Arnd Bergmann wrote:
It does not happen too often on syzbot so far, so let's try to do the
right thing first.
I've filed: https://bugs.launchpad.net/qemu/+bug/19189
On Fri, Mar 12, 2021 at 11:38 AM Dmitry Vyukov wrote:
> On Fri, Mar 12, 2021 at 11:11 AM Arnd Bergmann wrote:
>
> It does not happen too often on syzbot so far, so let's try to do the
> right thing first.
> I've filed: https://bugs.launchpad.net/qemu/+bug/1918917
> with a link to this thread. To
On Fri, Mar 12, 2021 at 11:11 AM Arnd Bergmann wrote:
> > > On Fri, Mar 12, 2021 at 9:46 AM Dmitry Vyukov wrote:
> > > > On Fri, Mar 12, 2021 at 9:40 AM Arnd Bergmann wrote:
> > > > > On Thu, Mar 11, 2021 at 6:57 PM Dmitry Vyukov
> > > > > wrote:
> > > > > a) accessing a legacy ISA/LPC port sh
On Fri, Mar 12, 2021 at 10:21 AM Dmitry Vyukov wrote:
>
> On Fri, Mar 12, 2021 at 10:16 AM Arnd Bergmann wrote:
> >
> > On Fri, Mar 12, 2021 at 9:46 AM Dmitry Vyukov wrote:
> > > On Fri, Mar 12, 2021 at 9:40 AM Arnd Bergmann wrote:
> > > > On Thu, Mar 11, 2021 at 6:57 PM Dmitry Vyukov
> > > >
On Fri, Mar 12, 2021 at 10:16 AM Arnd Bergmann wrote:
>
> On Fri, Mar 12, 2021 at 9:46 AM Dmitry Vyukov wrote:
> > On Fri, Mar 12, 2021 at 9:40 AM Arnd Bergmann wrote:
> > > On Thu, Mar 11, 2021 at 6:57 PM Dmitry Vyukov wrote:
> > > a) accessing a legacy ISA/LPC port should not result in an oop
On Fri, Mar 12, 2021 at 9:46 AM Dmitry Vyukov wrote:
> On Fri, Mar 12, 2021 at 9:40 AM Arnd Bergmann wrote:
> > On Thu, Mar 11, 2021 at 6:57 PM Dmitry Vyukov wrote:
> > a) accessing a legacy ISA/LPC port should not result in an oops,
> > but should instead return values with all bits set. Th
On Fri, Mar 12, 2021 at 9:40 AM Arnd Bergmann wrote:
>
> On Thu, Mar 11, 2021 at 6:57 PM Dmitry Vyukov wrote:
> > On Thu, Mar 11, 2021 at 2:30 PM Arnd Bergmann wrote:
> > > >
> > > > The instances found few arm64-specific issues that we have not
> > > > observed on other instances:
> > >
> > > I
On Thu, Mar 11, 2021 at 6:57 PM Dmitry Vyukov wrote:
> On Thu, Mar 11, 2021 at 2:30 PM Arnd Bergmann wrote:
> > >
> > > The instances found few arm64-specific issues that we have not
> > > observed on other instances:
> >
> > I've had a brief look at these:
> >
> > > https://syzkaller.appspot.com
On Thu, Mar 11, 2021 at 6:25 PM Dmitry Vyukov wrote:
>
> On Thu, Mar 11, 2021 at 2:30 PM Arnd Bergmann wrote:
> >
> > On Thu, Mar 11, 2021 at 12:38 PM Dmitry Vyukov wrote:
> > >
> > > The instances found few arm64-specific issues that we have not
> > > observed on other instances:
> >
> > I've h
On Thu, Mar 11, 2021 at 2:30 PM Arnd Bergmann wrote:
> >
> > The instances found few arm64-specific issues that we have not
> > observed on other instances:
>
> I've had a brief look at these:
>
> > https://syzkaller.appspot.com/bug?id=1d22a2cc3521d5cf6b41bd6b825793c2015f861f
>
> This one doesn't
On Thu, Mar 11, 2021 at 2:30 PM Arnd Bergmann wrote:
>
> On Thu, Mar 11, 2021 at 12:38 PM Dmitry Vyukov wrote:
> >
> > The instances found few arm64-specific issues that we have not
> > observed on other instances:
>
> I've had a brief look at these:
>
> > https://syzkaller.appspot.com/bug?id=1d2
On Thu, Mar 11, 2021 at 1:33 PM Mark Rutland wrote:
> On Thu, Mar 11, 2021 at 12:38:21PM +0100, 'Dmitry Vyukov' via syzkaller wrote:
> > Hi arm64 maintainers,
> > The instances have KCOV disabled because it slows down execution too
> > much (KASAN in qemu emulation is already extremely slow), so n
On Thu, Mar 11, 2021 at 1:33 PM Mark Rutland wrote:
>
> On Thu, Mar 11, 2021 at 12:38:21PM +0100, 'Dmitry Vyukov' via syzkaller wrote:
> > Hi arm64 maintainers,
>
> Hi Dmitry,
>
> > We now have some syzbot instances testing arm64 (woohoo!) using qemu
> > emulation. I wanted to write up the current
On Thu, Mar 11, 2021 at 12:38 PM Dmitry Vyukov wrote:
>
> The instances found few arm64-specific issues that we have not
> observed on other instances:
I've had a brief look at these:
> https://syzkaller.appspot.com/bug?id=1d22a2cc3521d5cf6b41bd6b825793c2015f861f
This one doesn't seem arm64 sp
On Thu, Mar 11, 2021 at 12:38:21PM +0100, 'Dmitry Vyukov' via syzkaller wrote:
> Hi arm64 maintainers,
Hi Dmitry,
> We now have some syzbot instances testing arm64 (woohoo!) using qemu
> emulation. I wanted to write up the current status.
Nice!
> There are 3 instances, first uses KASAN:
> https
Hi arm64 maintainers,
We now have some syzbot instances testing arm64 (woohoo!) using qemu
emulation. I wanted to write up the current status.
There are 3 instances, first uses KASAN:
https://syzkaller.appspot.com/upstream?manager=ci-qemu2-arm64
second KASAN and 32-bit userspace test load (compat
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