u/Phoxerity

Hi everyone,

I’m trying to install and run the new Antigravity CLI (agy) inside an Ubuntu PRoot environment on Termux (ARM64) Samsung Tab S8+, but I've hit a wall with a persistent memory allocation error.

Whenever I try to run agy --version, the binary crashes immediately with this error:

1 third_party/tcmalloc/internal/system_allocator.h:595] MmapAligned() failed -unable to allocate with tag ...

2 third_party/tcmalloc/internal/system_allocator.h:602] Note: the allocation may have failed because TCMalloc assumes a 48-bit virtual address space size; you may need to rebuild TCMalloc with TCMALLOC_ADDRESS_BITS defined to your system's virtual address space size

3 third_party/tcmalloc/arena.cc:61] CHECK in Alloc: FATAL ERROR: Out of memory trying to allocate internal tcmalloc data

The Problem:

It seems the binary is compiled with Google's tcmalloc, which is hard-coded to expect a 48-bit virtual address space. My Android kernel (like most) is limited to a 39-bit VA space. When tcmalloc tries to map metadata to high addresses, the kernel rejects it.

What I’ve already tried (none worked):

1. Setting PROOT_NO_SECCOMP=1 before login.
2. Using export TCMALLOC_SKIP_MMAP=true.
3. Attempting to LD_PRELOAD different allocators (libc.so.6, libjemalloc.so).
4. Running the x86_64 version of the CLI via qemu-x86_64 (fails with the same VSS error).
5. Using a custom C shim to intercept mmap calls and strip high-address hints.

My Questions:

* Is there any way to force a pre-compiled tcmalloc binary to respect a 39-bit address space without having the source code to recompile it?

* Has anyone found a workaround for this specific "48-bit assumption" in other Google-distributed binaries (like Envoy or Bazel) when running in Termux?

* Is there a "compatible" build of agy available that I might have missed?

Any help or crazy workarounds would be much appreciated!