Re: [Qemu-devel] master: intermittent acpi-test failures

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Jun 08, 2014 at 09:48:39AM +0100, Peter Maydell wrote:
> On 8 June 2014 08:37, Michael S. Tsirkin <mst@redhat.com> wrote:
> > On Tue, May 27, 2014 at 10:38:17PM +0100, Peter Maydell wrote:
> >> I'm seeing this test failure intermittently on 'make check':
> >>
> >> ERROR:/root/qemu/tests/acpi-test.c:618:test_acpi_one: assertion failed
> >> (signature == SIGNATURE): (0x00000000 == 0x0000dead)
> >> GTester: last random seed: R02S8d0d60963e4442ce284a81d20ce32053
> >>
> >> (32 bit ARM host, in case that makes a difference.)
> >>
> >> Any ideas? It looks from the test as if this may just be
> >> that the test is coded to assume a faster machine, which
> >> is a bit unfortunate.
> 
> > We have a timeout of 1 minute there.
> > Since all VM has to do is run BIOS initialization
> > and then write out the signature, this seems ample.
> 
> See my earlier email -- when the test completes it does
> so within 8 or 9 loops (where the max is set at 600);
> so I don't think raising the timeout will help -- something
> has got stuck.
> 
> > If it does we can do this, though I suspect this is merely
> > a work-around, there's probably something that
> > causes QEMU to pause execution during early BIOS boot.
> > Could you try strace to see what it is?
> 
> I'll give this a try.
> 
> thanks
> -- PMM

We have a use after free memory corruption ATM,
I don't see why it would trigger on this path
but can't hurt to try Paolo's patch.