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

[Ralph Versteegen]

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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