From: "midnight (Sarun R) via ruby-core" <ruby-core@...>
Date: 2025-01-29T14:14:01+00:00
Subject: [ruby-core:120828] [Ruby master Bug#21096] Ruby hangs up when compiling for bytecode on AArch64 emulated by QEMU

Issue #21096 has been updated by midnight (Sarun R).


You are one of the most responsive people I have ever encountered.

To test the reproduction, iiewad provided a branch of his application where this issue occurs.
(It���s essentially a standard Rails application with something like `--verbose` added to the `Dockerfile` for visualization.)

~~~bash
git clone -b debug https://github.com/iiewad/blog.git iiewad-blog
cd iiewad-blog
~~~

In my environment, I use the following command:
~~~bash
sudo nerdctl build --platform=arm64 .
~~~

(containerd has both rootless and rootful modes; multi-architecture building requires the rootful one.)

I���ve already confirmed that the code from the repository reproduces the issue in my environment.
![Screenshot](https://i.imgur.com/uisLCi4.png)
Since he included `--verbose` in the `Dockerfile`, the screenshot shows where bootsnap is hanging.

Software versions:
iiewad-blog: commit-c8f6d15
nerdctl:
> Client:
>  Version:	2.0.2
>  OS/Arch:	linux/amd64
>  Git commit:	unknown
>  buildctl:
>   Version:	0.18.2
> 
> Server:
>  containerd:
>   Version:	v1.7.23
>   GitCommit:	57f17b0a6295a39009d861b89e3b3b87b005ca27
>  runc:
>   Version:	1.2.4
>   GitCommit:	v1.2.4-0-g6c52b3fc541f

QEMU
~~~bash
sudo systemctl start containerd
sudo nerdctl run --privileged --rm tonistiigi/binfmt:qemu-v8.1.5 --install arm64
~~~

Feel free to ask if you run into any issues with the reproduction steps or need more details about the environment I���m using.

----------------------------------------
Bug #21096: Ruby hangs up when compiling for bytecode on AArch64 emulated by QEMU
https://bugs.ruby-lang.org/issues/21096#change-111695

* Author: midnight (Sarun R)
* Status: Open
* ruby -v: ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Hello,

We are experiencing issues when using [Bootsnap](https://github.com/Shopify/bootsnap) for production container image building, specifically when running `bundle exec bootsnap precompile --gemfile` on an emulated ARM64 environment on AMD64 hosts.

Here are more details:
* Bootsnap is a Ruby gem for bytecode caching, which speeds up loading times. It achieves this by calling `RubyVM::InstructionSequence.compile_file` and `RubyVM::InstructionSequence.load_from_binary`.
* When running `bundle exec bootsnap precompile --gemfile` in the environment described (using QEMU to emulate the AArch64 instruction set), the process can compile and generate some bytecode but eventually hangs.
* The hang seems random, occurring at different points during the process.
* According to [a Rails GitHub issue](https://github.com/rails/rails/issues/54039), the issue affects both `Docker` and `containerd`, as well as native Linux and macOS environments.
* From [a Bootsnap GitHub issue](https://github.com/Shopify/bootsnap/issues/495), the problem likely doesn't occur in Ruby `3.2.6` but appears in later versions.
* So far, the common factors observed are:
  * Emulated ARM64 on AMD64 CPUs (likely using QEMU)
  * Newer Ruby versions (e.g., 3.3 and 3.4)

As a user, I don't have the expertise to debug the issue but am willing to gather more information if provided with sufficient instructions.



-- 
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