* [ruby-core:120817] [Ruby master Bug#21096] Ruby hangs up when compiling for bytecode on AArch64 emulated by QEMU
@ 2025-01-29 7:28 midnight (Sarun R) via ruby-core
2025-01-29 11:40 ` [ruby-core:120825] " byroot (Jean Boussier) via ruby-core
2025-01-29 14:14 ` [ruby-core:120828] " midnight (Sarun R) via ruby-core
0 siblings, 2 replies; 3+ messages in thread
From: midnight (Sarun R) via ruby-core @ 2025-01-29 7:28 UTC (permalink / raw)
To: ruby-core; +Cc: midnight (Sarun R)
Issue #21096 has been reported by midnight (Sarun R).
----------------------------------------
Bug #21096: Ruby hangs up when compiling for bytecode on AArch64 emulated by QEMU
https://bugs.ruby-lang.org/issues/21096
* 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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^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:120825] [Ruby master Bug#21096] Ruby hangs up when compiling for bytecode on AArch64 emulated by QEMU
2025-01-29 7:28 [ruby-core:120817] [Ruby master Bug#21096] Ruby hangs up when compiling for bytecode on AArch64 emulated by QEMU midnight (Sarun R) via ruby-core
@ 2025-01-29 11:40 ` byroot (Jean Boussier) via ruby-core
2025-01-29 14:14 ` [ruby-core:120828] " midnight (Sarun R) via ruby-core
1 sibling, 0 replies; 3+ messages in thread
From: byroot (Jean Boussier) via ruby-core @ 2025-01-29 11:40 UTC (permalink / raw)
To: ruby-core; +Cc: byroot (Jean Boussier)
Issue #21096 has been updated by byroot (Jean Boussier).
As mentioned on the Rails issue, this is unlikely to be debugged unless a reproducer is provided, which does include a Ruby script or application that cause the hang when compiled, and the precise host and container versions.
----------------------------------------
Bug #21096: Ruby hangs up when compiling for bytecode on AArch64 emulated by QEMU
https://bugs.ruby-lang.org/issues/21096#change-111692
* 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.
--
https://bugs.ruby-lang.org/
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^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:120828] [Ruby master Bug#21096] Ruby hangs up when compiling for bytecode on AArch64 emulated by QEMU
2025-01-29 7:28 [ruby-core:120817] [Ruby master Bug#21096] Ruby hangs up when compiling for bytecode on AArch64 emulated by QEMU midnight (Sarun R) via ruby-core
2025-01-29 11:40 ` [ruby-core:120825] " byroot (Jean Boussier) via ruby-core
@ 2025-01-29 14:14 ` midnight (Sarun R) via ruby-core
1 sibling, 0 replies; 3+ messages in thread
From: midnight (Sarun R) via ruby-core @ 2025-01-29 14:14 UTC (permalink / raw)
To: ruby-core; +Cc: midnight (Sarun R)
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.

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.
--
https://bugs.ruby-lang.org/
______________________________________________
ruby-core mailing list -- ruby-core@ml.ruby-lang.org
To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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