[Ohrrpgce] [ohrrpgce/ohrrpgce] "UPDATE_WALKABOUT_POS: missing sprite component" (#1137)

[James Paige]

I tried valgrind, and the crash simply didn't happen.

I'll try asan also

On Mon., Apr. 26, 2021, 11:41 p.m. Ralph Versteegen, <
***@***.***> wrote:

> Sounds like it could be a dangling pointer.
>
> Can you use valgrind or asan (AddressSanitizer)?
>
> I have a lot of poor luck with valgrind, sometimes I can't really get it to
> work, and it's a pain that I always have to spend a long time updating
> misc/valgrind_suppressions.txt after having upgraded parts of my OS.
>
> asan doesn't seem to have that problem. To use asan compile with "scons
> asan=1", which compiles in memory error checking into C code (it forces
> gengcc=1). Like valgrind, asan can report reads/writes off the end of
> allocated memory or access to freed memory.
>
> On Tue, 27 Apr 2021 at 09:04, James Paige ***@***.***> wrote:
>
> > This is a tricky one!
> > I have a test case that crashes on this, but very tiny seemingly
> > irrelevant changes to the source code can prevent the crash from
> happening.
> >
> > For example, if I comment out everything in the implementation of "camera
> > follows hero" in scriptcommands.bas then the crash doesn't happen. Or if
> I
> > add debug comments inside update_HeroSliceContext() then the crash
> doesn't
> > happen.
> >
> > I assume memory is being corrupted and that these small changes are
> > altering the layout of the corrupted memory just enough to prevent the
> crash
> >
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