Valgrind and Sanitizers should work on Alumina. I have not actually tried them myself yet, but I don't see any reason why they couldn't work.

The only potential problem I see that with the current C backend, the debugging information is very hard to trace back to the original Alumina source code, so it might be hard to see where the leaks are coming from. This is something I plan to address in the self-hosted compiler, once it is functional.