[llvm] r273585 - Preserve DebugInfo when replacing values in DAGCombiner

[Nirav Davé via llvm-commits]

Not yet. I've run it for multiple days in multiple contexts but it never
crashes for me.

I've been working on it from first principles but aside from that minor
patch I sent you that slightly cleans up usage, I haven't found anything
that could be labelled as wrong. Most upsettingly, none of the Debug Values
in question have ever been freed at the time of the crash; They're
allocated in a bumpptr allocator which defers freeing until after we're
done with SelectionDAG.

-Nirav


On Jul 26, 2016 07:38, "Ismail Donmez" <ismail at i10z.com> wrote:
>
> Any luck with reproducing? This bug affects us really badly, we are
> unable to produce a snapshot more than a month now :(
>
> ismail
>
> On Fri, Jul 22, 2016 at 9:57 AM, Ismail Donmez <ismail at i10z.com> wrote:
> > Hi Nirav,
> >
> > On Thu, Jul 21, 2016 at 10:37 PM, Nirav Davé <niravd at google.com> wrote:
> >> Ismall:
> >>
> >> I'm still having problems finding reproducing this corruption locally,
but I
> >> may have a patch. Can you check if this works?
> >> If it doesn't, maybe you can spot what I'm doing wrong in my
reproduction
> >> steps.
> >
> > Sadly the patch didn't help. What I did to reproduce the crash was
> > running the reproducer script from
> > https://llvm.org/bugs/show_bug.cgi?id=28613 in a tight loop like:
> >
> > while true; do ./Loop-blabla.sh && sleep 1; done
> >
> > After it crashes I used the core file with gdb to debug. Of course
> > you'll still need to export MALLOC_CHECK_ and MALLOC_PERTURB_
> > beforehand.
> >
> > Regards,
> > ismail
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