Re: [Tinycc-devel] Segfault due to ebaa5c8 dynamic executables (PIE)

[Arthur Williams]

On Sat, Aug 13, 2022 at 11:36:00AM +0200, Herman ten Brugge wrote:
> I changed debug check in tccdbg.c on mob. Could you try again.
>
>     Herman
>
>
> On 8/6/22 21:35, Arthur Williams wrote:
> > Was trying to compile X and noticed that it failed building hw/xfree86/
> >
> > Turns out tcc was segfaulting by trying to deference a null address.
> > Bisected mob to conclude that this regression was introduced by
> > `ebaa5c8 dynamic executables (PIE)`.
> >
> > Also built tcc with its backtracing support and re-ran to get the
> > following output:
> > ```
> > 7f282ff1293c : by ???
> > tccelf.c:311: by section_ptr_add
> > tccdbg.c:453: by put_stabs
> > tccdbg.c:477: by put_stabn
> > ```
> >
> > And putting that all together, `section_ptr_add` received a null `Section`
> > which implies `stab_section` is null. Double-checked this conclusion by
> > adding an assert.
> >
> > Not too familiar with this part of the code so thought I'd just share my
> > observations.
> >
> > Arthur
> >
>

Thanks. I can no longer repro this issue on mob.

Arthur