Shadow memory range interleaves with an existing memory mapping. ASan cannot proceed correctly. ABORTING - part2

[aescolar]

This issue is quite related to #820 , and also to #837
Using gcc 13.2.0, Ubuntu 24.04.
I would like to build a program with ASan, where the program needs to have some of its virtual memory map in fixed ranges. One of them starting at 0x2000_0000. It really does not matter why it needs to be fixed there, and at the end of the day, be this or any other reason where the elf ends up with a segment in the ASan fixed range, this issue would apply.

In any case, this leads to the error when trying to run ASan:

==..==Shadow memory range interleaves with an existing memory mapping. ASan cannot proceed correctly. ABORTING.
==..==ASan shadow was supposed to be located in the [0x1ffff000-0x3fffffff] range.

From the discussion in #837 I gather there has been thought on having ASan use a dynamic range instead of a fixed one, but it seems this track has not been pursued(?).

So my ask:

• Is there any way today, to tell ASan, either at build time of the program, or at runtime either code at init, or thru an environment variable or.., to use a different address range?
• Are you guys considering continuing in the track of having ASan use a dynamic range, instead of a fixed one?

CC @kcc