Why UBSAN is marked as using a lot of memory?

Hello,

In the configuration makefile mk/config.mk there are following lines:

# Enable support for detected undefined behavior in C # Uses a lot of memory, can't be enabled by default CFG_CORE_SANITIZE_UNDEFINED ?= n

I've read the sources of the conditionally compiled ubsan.c and, IIUC, how UBSAN is working (mostly by adding simple checks), I don't understand, why UBSAN is marked as using a lot of memory.

Is this comment still valid?

Thank you.