Re: [Qemu-devel] [PATCH] hmp: fix "dump-quest-memory" segfault (ppc)

["Daniel P. Berrange" <berrange@redhat.com>]

On Mon, Sep 11, 2017 at 02:10:14PM +0200, Laurent Vivier wrote:
> On 11/09/2017 14:04, Dr. David Alan Gilbert wrote:
> > * Daniel P. Berrange (berrange@redhat.com) wrote:
> >> On Mon, Sep 11, 2017 at 01:41:58PM +0200, Cornelia Huck wrote:
> >>> On Mon, 11 Sep 2017 12:06:15 +0100
> >>> "Daniel P. Berrange" <berrange@redhat.com> wrote:
> >>>
> >>>> On Mon, Sep 11, 2017 at 01:00:37PM +0200, Laurent Vivier wrote:
> >>>>> Commit fd5d23babf (hmp: fix "dump-quest-memory" segfault)
> >>>>> fixes the problem for i386, do the same for ppc.  
> >>>>
> >>>> What about all the other targets QEMU supports ?  Have you checked if they
> >>>> are similarly affected, as we don't want to wait another 6 months to get a
> >>>> bug report that s390 or aarch64 crash in exactly the same way too.
> >>>
> >>> This patch actually prompted me to check s390, and the mentioned
> >>> command line works fine.
> >>>
> >>> However, if we start a qemu with no guest memory defined and then call
> >>> dump-guest-memory without filtering, we get a core dump instead of a
> >>> guest dump (s390x or x86_64, machine none).
> >>>
> >>> I can take a stab at fixing that, unless someone beats me to it.
> >>
> >> I wonder if someone wants to write a qtest job to run dump-guest-memory
> >> across all machine types, on all targets. Seems we have enough crashiness
> >> in this code to make it worthwhile to test
> > 
> > We do have - that's how we found this case;  it's part of test-hmp.
> 
> The test-hmp runs by default with 0 MB of memory, the problem can only
> be found with some memory added to the machine.
> 
> Perhaps we can simply update the test to add memory?

Probably best to run it twice, 0MB and with say 2MB, as they're both
fairly magic values.

Regards,
Daniel
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