Re: Error with --no-huge when compiled with -fsanitize=address from gcc 15

["Robin Jarry" <rjarry@redhat.com>]

+Anatoly and Ferruh in direct address.

Robin Jarry, May 15, 2025 at 12:32:
> I recently updated to Fedora 42 that comes with GCC 15.
>
> When building with -fsanitize=address (libasan.so.8), it seems that
> the --no-huge mode (along with --no-shconf) fails at initialization for
> some obscure reason.
>
> "couldn't allocate memory due to IOVA exceeding limits of current DMA mask."

Hi Anatoly, Ferruh, all,

Allow me to bump this. GCC 15 has been out for quite a while now and it
seems that libasan cannot be used anymore with the DPDK memory allocator
as it is.

I have tracked the commit that introduced this warning up to 2018:

https://git.dpdk.org/dpdk/commit/?id=165c89b84538f

I would be much grateful if you could help. I don't know the internals
of libasan, but I assume it shuffles mapped memory around and it
conflicts with the DPDK allocator inner workings.

I have found this libasan commit which "could" be related:

https://github.com/llvm/llvm-project/commit/7ede1c497302

In fact, part of it was reverted a while after on macos because of
suspected breakage:

https://github.com/llvm/llvm-project/commit/4e332bba2f3a

-- 
Robin

> Driver does not carry cash.