How to remove tcmalloc error on aarch64

General
1

While trying to run mojo on aarch64 gives the following error, and for me its not possible to install server edition of Ubuntu with 48bit memory address space.

17555 external/tcmalloc+/tcmalloc/system-alloc.h:575] MmapAligned() failed - unable to allocate with tag (hint=0x6fb4c0000000, size=1073741824, alignment=1073741824) - is something limiting address placement? 17555 external/tcmalloc+/tcmalloc/system-alloc.h:582] 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
17555 external/tcmalloc+/tcmalloc/arena.cc:59] CHECK in Alloc: FATAL ERROR: Out of memory trying to allocate internal tcmalloc data (bytes=131072, object-size=16384); is something preventing mmap from succeeding (sandbox, VSS limitations)?
Aborted```
2

What command are you running that leads to this error message?

3

I installed mojo using pixi

cd hello-world

pixi shell

mojo –-version

userland@localhost:~/hello-world$ pixi shell

(hello-world) userland@localhost:~/hello-world$ mojo --version
31096 external/tcmalloc+/tcmalloc/system-alloc.h:575] MmapAligned() failed - unable to allocate with tag (hint=0x4f3000000000, size=1073741824, alignment=1073741824) - is something limiting address placement?
31096 external/tcmalloc+/tcmalloc/system-alloc.h:582] 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
31096 external/tcmalloc+/tcmalloc/arena.cc:59] CHECK in Alloc: FATAL ERROR: Out of memory trying to allocate internal tcmalloc data (bytes=131072, object-size=16384); is something preventing mmap from succeeding (sandbox, VSS limitations)?
Aborted
(hello-world) userland@localhost:~/hello-world$```
4

Thanks, and what machine/OS are you running on?

5 
System
------------
       Pixi version: 0.54.2
           Platform: linux-aarch64
   Virtual packages: __unix=0=0
                   : __linux=5.10.218=0
                   : __glibc=2.35=0
                   : __archspec=1=cortex_a72
          Cache dir: /home/userland/.cache/rattler/cache
       Auth storage: /home/userland/.rattler/credentials.json
   Config locations: No config files found

Global
------------
            Bin dir: /home/userland/.pixi/bin
    Environment dir: /home/userland/.pixi/envs
       Manifest dir: /home/userland/.pixi/manifests/pixi-global.toml

Workspace
------------
               Name: hello-world
            Version: 0.1.0
      Manifest file: /home/userland/hello-world/pixi.toml
       Last updated: 10-09-2025 04:47:37

Environments
------------
        Environment: default
           Features: default
           Channels: https://conda.modular.com/max-nightly, conda-forge
   Dependency count: 1
       Dependencies: mojo
   Target platforms: linux-aarch64
    Prefix location: /home/userland/hello-world/.pixi/envs/default


(hello-world) userland@localhost:~/hello-world$```
6

Thanks, I’ll see what we can determine and get back to you.

7

You wouldn’t happen to be on a Raspberry Pi 4, would you?

The Pi 4 has an odd address space size, and as a result tcmalloc doesn’t work in its default configuration.