libmemory_map.so not found when running ia2-sandbox as part of ninja check

[kkysen]

When running IA2 tests locally with ninja check, I keep getting errors like this on almost all of the tests:

/home/kkysen/work/rust/ia2/build/runtime/tracer/ia2-sandbox: error while loading shared libraries: libmemory_map.so: cannot open shared object file: No such file or directory

ldd also indicates libmemory_map.so is not found in ia2-sandbox:

❯ ldd build/runtime/tracer/ia2-sandbox
        linux-vdso.so.1 (0x00007ffe2f1c7000)
        libmemory_map.so => not found
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x0000797256c00000)
        /lib64/ld-linux-x86-64.so.2 (0x0000797256ec6000)

And ia2-sandbox also doesn't have any RPATH/RUNPATH:

❯ objdump -x build/runtime/tracer/ia2-sandbox | rg 'R.*PATH'

This is the command that's building ia2-sandbox:

cc -g runtime/tracer/CMakeFiles/ia2-sandbox.dir/start.c.o runtime/tracer/CMakeFiles/ia2-sandbox.dir/seccomp_filter.c.o runtime/tracer/CMakeFiles/ia2-sandbox.dir/track_memory_map.c.o runtime/tracer/CMakeFiles/ia2-sandbox.dir/mmap_event.c.o runtime/tracer/CMakeFiles/ia2-sandbox.dir/get_inferior_pkru.c.o runtime/tracer/CMakeFiles/ia2-sandbox.dir/landlock.c.o runtime/tracer/CMakeFiles/ia2-sandbox.dir/strv.c.o runtime/tracer/CMakeFiles/ia2-sandbox.dir/forbid_paths.c.o -o runtime/tracer/ia2-sandbox runtime/tracer//release/libmemory_map.so

I can work around this by setting LD_LIBRARY_PATH="$PWD/build/runtime/tracer/release/" ninja check.

This is still working in CI, but not locally (and reproducible locally by @fw-immunant). It also used to work locally, so we should hopefully be able to bisect to find where this broke.

[kkysen]

I git bisected and tracked this down to 5828dee, which is when the ia2-sandbox runtime was added to tests, so I'm not sure this was ever working locally. Note that I did have to switch to LLVM 16 to bisect correctly, as a lot of old commits don't compile on LLVM 17 and 18.