[ruby-core:115905] [Ruby master Bug#20085] Fiber.new{ }.resume causes Segmentation fault for Ruby 3.3.0 on aarch64-linux

Issue #20085 has been updated by ioquatix (Samuel Williams).


I think we should backport this fix urgently.

----------------------------------------
Bug #20085: Fiber.new{ }.resume causes Segmentation fault for Ruby 3.3.0 on aarch64-linux
https://bugs.ruby-lang.org/issues/20085#change-105860

* Author: oleksii (Oleksii Leonov)
* Status: Open
* Priority: Normal
* Assignee: katei (Yuta Saito)
* ruby -v: ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [aarch64-linux]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
```
ruby -e "Fiber.new{}.resume"

0.170 -e:1: [BUG] Segmentation fault at 0x0036ffffb4f110f0
0.170 ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [aarch64-linux]
0.170 
0.170 -- Control frame information -----------------------------------------------
0.170 c:0003 p:---- s:0010 e:000009 CFUNC  :resume
0.170 c:0002 p:0007 s:0006 E:0005e0 EVAL   -e:1 [FINISH]
0.170 c:0001 p:0000 s:0003 E:000b50 DUMMY  [FINISH]
0.170 
0.170 -- Ruby level backtrace information ----------------------------------------
0.170 -e:1:in `<main>'
0.170 -e:1:in `resume'
0.170 
0.170 -- Threading information ---------------------------------------------------
0.170 Total ractor count: 1
0.170 Ruby thread count for this ractor: 1
0.170 
0.170 -- Machine register context ------------------------------------------------
0.170   x0: 0x0000aaab11b4f570  x1: 0x0000aaab11de4a40  x2: 0x0000ffffe5571990
0.170   x3: 0x0000ffff9ac5ff60  x4: 0x0000ffff9ac60018  x5: 0x0000ffff9ac80000
0.170   x6: 0x0000ffffb5458b88  x7: 0x0000000000000000 x18: 0x00000000007fffff
0.170  x19: 0x0000000000000000 x20: 0x0000000000000000 x21: 0x0000000000000000
0.170  x22: 0x0000000000000000 x23: 0x0000000000000000 x24: 0x0000000000000000
0.170  x25: 0x0000000000000000 x26: 0x0000000000000000 x27: 0x0000000000000000
0.170  x28: 0x0000000000000000 x29: 0x0000000000000000  sp: 0x0000ffff9ac60000
0.170  fau: 0x0036ffffb4f110f0
0.170 
0.170 -- C level backtrace information -------------------------------------------
0.171 Segmentation fault
```

- Ruby 3.3.0-rc1 and 3.2.2 work without Segmentation fault on both amd64 and arm64.
- Ruby 3.3.0 works on amd64, but fails with Segmentation fault on arm64 (aarch64-linux) on Ubuntu 22.04 and Debian Bookworm.

Dockerfile to reproduce:
```
FROM debian:bookworm

# Set UTF-8 locale by default.
ENV RBENV_ROOT=/usr/local/rbenv \
    PATH=/usr/local/rbenv/bin:/usr/local/rbenv/shims:$PATH

RUN ( \
  export DEBIAN_FRONTEND=noninteractive \
  && apt-get update \
  && apt-get install -y --no-install-recommends \
        ca-certificates curl git \
        # standard dependencies for rbenv
        autoconf \
        patch \
        build-essential \
        rustc \
        libssl-dev \
        libyaml-dev \
        libreadline6-dev \
        zlib1g-dev \
        libgmp-dev \
        libncurses5-dev \
        libffi-dev \
        libgdbm6 \
        libgdbm-dev \
        libdb-dev \
        uuid-dev \
  )

ENV RBENV_VERSION=3.3.0

RUN ( \
  export DEBIAN_FRONTEND=noninteractive \
  # Install rbenv & ruby-build
  && git clone https://github.com/rbenv/rbenv.git /usr/local/rbenv \
  && git clone https://github.com/rbenv/ruby-build.git /usr/local/rbenv/plugins/ruby-build \
  && /usr/local/rbenv/plugins/ruby-build/install.sh \
  && echo 'export RBENV_ROOT=/usr/local/rbenv' >> /etc/profile.d/rbenv.sh \
  && echo 'export PATH=/usr/local/rbenv/bin:$PATH' >> /etc/profile.d/rbenv.sh \
  && echo 'eval "$(rbenv init -)"' >> /etc/profile.d/rbenv.sh \
  && echo 'export RBENV_ROOT=/usr/local/rbenv' >> /root/.bashrc \
  && echo 'export PATH=/usr/local/rbenv/bin:$PATH' >> /root/.bashrc \
  && echo 'eval "$(rbenv init -)"' >> /root/.bashrc \
  && eval "$(rbenv init -)"; rbenv install $RBENV_VERSION \
  && eval "$(rbenv init -)"; rbenv global $RBENV_VERSION \
  )

RUN 

RUN ruby -e "Fiber.new{}.resume"
```

`docker build --platform linux/arm64 .`

---Files--------------------------------
Dockerfile (1.53 KB)


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