help needed to find a bug in zorba (or gcc 4.9)

[Petr Spacek]

On 10.6.2014 14:16, Martin Gieseking wrote:
> Hi,
>
> I've tried to fix the broken zorba package in rawhide for a couple of weeks
> now but, unfortunately, without much success. The upstream developers don't
> seem to be able to find the cause for the issue either.
>
> The problem is that the package fails to build with gcc 4.9.0 (all archs)
> because the generated zorba binary segfaults for some queries due to accessing
> already freed memory. The issue only occurs with optimized builds (-O1, -O2,
> -O3) using gcc 4.9.0. With gcc 4.8.x the binary and thus the whole package
> build and work correctly. Therefore, it might also be possible that there's a
> bug in gcc's optimizer, but I'm not sure.
>
> valgrind and gcc's address sanitizer report the code sections where the error
> occurs but when stepping through them with a debugger, I'm unable to
> understand what's actually going on there. It looks as if the affected code
> should work properly. So I got stuck now.
>
> It would be great if someone could help to track down the issue in order to
> keep the package available in Fedora.
>
> Here is the latest SRPM:
> http://mgieseki.fedorapeople.org/review/zorba-3.0.0-4.fc21.src.rpm
>
> The corresponding bug tickets can be found here:
> https://bugzilla.redhat.com/show_bug.cgi?id=1095292
> https://bugs.launchpad.net/bugs/1317976
>
> Thanks,
> Martin

Does it happen if you compile it *with* -fno-delete-null-pointer-checks switch?

That one caused a lot of grief with BIND 9.

-- 
Petr^2 Spacek