Re: [PATCH] lib: Kconfig: disable dynamic sanitizers for test builds

[Nick Desaulniers]

On Wed, Oct 18, 2023 at 9:22 AM Marco Elver <elver@xxxxxxxxxx> wrote:
>
> That being said, we're aware of KASAN having had more issues and there
> are some suboptions that have been disabled because of that (like
> KASAN_STACK). I'm not sure if Clang's KASAN instrumentation has had
> some recent improvements (we did investigate it, but I can't recall
> what the outcome was [1]) - maybe try a more recent compiler? However,
> KCSAN and KMSAN shouldn't have any issues (if KMSAN is enabled,
> FRAME_WARN is 0). And having build tests with them enabled isn't
> useless at all: we're making sure that these tools (even though only
> for debugging), still work. We _want_ them to work during random build
> testing!
>
> Please share the concrete problem you're having, because this change
> will make things worse for everyone in the long run.
>
> [1] https://github.com/llvm/llvm-project/issues/38157

Some recent issues I discovered in clang that exacerbate stack usage
in general, which is then amplified by KASAN:
1. https://github.com/llvm/llvm-project/issues/68746
2. https://github.com/llvm/llvm-project/issues/68747
Those are next up on my to fix list after what I'm working on now.  I
suspect that those aren't the last issues now that I've found a thread
to pull on.

-- 
Thanks,
~Nick Desaulniers