[ruby-core:115895] [Ruby master Bug#20085] Fiber.new{ }.resume causes Segmentation fault for Ruby 3.3.0 on aarch64-linux

Issue #20085 has been updated by tomog105 (Tomohiro Ogoke).


In my environment, I could reproduce if I used the Apple Virtualization framework (VZ) machine type in a container execution environment (Rancher Desktop), but I couldn't reproduce if I used the QEMU emulators machine type.
I shared `/proc/cpuinfo` of both machines.

### VZ machine type (could reproduce the segfault)
```
$ cat /proc/cpuinfo
rdctl shell cat /proc/cpuinfo
processor	: 0
BogoMIPS	: 48.00
Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 asimddp sha512 asimdfhm dit uscat ilrcpc flagm ssbs sb paca pacg dcpodp flagm2 frint
CPU implementer	: 0x00
CPU architecture: 8
CPU variant	: 0x0
CPU part	: 0x000
CPU revision	: 0

processor	: 1
BogoMIPS	: 48.00
Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 asimddp sha512 asimdfhm dit uscat ilrcpc flagm ssbs sb paca pacg dcpodp flagm2 frint
CPU implementer	: 0x00
CPU architecture: 8
CPU variant	: 0x0
CPU part	: 0x000
CPU revision	: 0
```

### QEMU machine type (couldn't reproduce the segfault)
```
$ cat /proc/cpuinfo
processor	: 0
BogoMIPS	: 48.00
Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 asimddp sha512 asimdfhm dit uscat ilrcpc flagm sb paca pacg dcpodp flagm2 frint
CPU implementer	: 0x00
CPU architecture: 8
CPU variant	: 0x0
CPU part	: 0x000
CPU revision	: 0

processor	: 1
BogoMIPS	: 48.00
Features	: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 asimddp sha512 asimdfhm dit uscat ilrcpc flagm sb paca pacg dcpodp flagm2 frint
CPU implementer	: 0x00
CPU architecture: 8
CPU variant	: 0x0
CPU part	: 0x000
CPU revision	: 0
```


----------------------------------------
Bug #20085: Fiber.new{ }.resume causes Segmentation fault for Ruby 3.3.0 on aarch64-linux
https://bugs.ruby-lang.org/issues/20085#change-105851

* 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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