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> Static runtime will only intercept calls from the main executable, but > not from any libraries. This may work for simple standalone programs, > but you may run into puzzling failures. What type of failures do you mean? Does the symbol mismatch break assumptions in the ASan runtime? It's easy to imagine, for example, ASan missing use-after-free bugs because the call to free() is

For the same reason we use shared runtime on OSX. We intercept libc calls by declaring a function with the same name in the sanitizer runtime library. Glibc loader puts main executable early in the symbol lookup order, which lets us interpose symbols from shared libraries with symbols from statically linked sanitizer runtime. Android (and AFAIK most other platforms) does not allow that, which is