Re: [PATCH] qtest: add a reproducer for LP#1878642

[Alexander Bulekov]

On 210216 1325, Peter Maydell wrote:
> On Mon, 2 Nov 2020 at 16:35, Alexander Bulekov <alxndr@bu.edu> wrote:
> >
> > https://bugs.launchpad.net/qemu/+bug/1878642
> >
> > Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
> > Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
> > ---
> >
> > Based-on: <20200717151705.18611-1-f4bug@amsat.org>
> >
> > The added testcase will fail, unless this ^^^ patch is applied.
> >
> >  tests/qtest/fuzz-test.c | 15 +++++++++++++++
> >  1 file changed, 15 insertions(+)
> >
> > diff --git a/tests/qtest/fuzz-test.c b/tests/qtest/fuzz-test.c
> > index 2f38bb1ec2..9cb4c42bde 100644
> > --- a/tests/qtest/fuzz-test.c
> > +++ b/tests/qtest/fuzz-test.c
> > @@ -34,6 +34,19 @@ static void test_lp1878263_megasas_zero_iov_cnt(void)
> >      qtest_quit(s);
> >  }
> >
> > +static void test_lp1878642_pci_bus_get_irq_level_assert(void)
> > +{
> > +    QTestState *s;
> > +
> > +    s = qtest_init("-M pc-q35-5.0 "
> > +                   "-nographic -monitor none -serial none "
> > +                   "-d guest_errors -trace pci*");
> > +
> > +    qtest_outl(s, 0xcf8, 0x8400f841);
> > +    qtest_outl(s, 0xcfc, 0xebed205d);
> > +    qtest_outl(s, 0x5d02, 0xebed205d);
> > +}
> 
> Hi; I just noticed this, but why does this test case pass
> "-trace pci*" to QEMU? It doesn't look like it does anything to
> try to capture the trace output, which thus winds up just going
> to the stdout/stderr of the "make check" run. Similarly I'm not
> sure '-d guest_errors' is going to do anything helpful unless
> you take steps to capture the output and check it.
> 

Ah, I sometimes include those in the initial report, if the device has
trace-events. I can remove this from fuzz-test.c, if it is slowing
things down.
-Alex

> thanks
> -- PMM