[ruby-core:123287] [Ruby Bug#21607] require 'concurrent-ruby' causes segfault with Ruby 3.4.6 on linux/i686 built with GCC 15

["Eregon (Benoit Daloze) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #21607 has been updated by Eregon (Benoit Daloze).


FWIW concurrent-ruby creates and resumes a Fiber while loading, this has found several issues like https://bugs.ruby-lang.org/issues/20085 (https://github.com/ruby-concurrency/concurrent-ruby/issues/1020) and this one.

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Bug #21607: require 'concurrent-ruby' causes segfault with Ruby 3.4.6 on linux/i686 built with GCC 15
https://bugs.ruby-lang.org/issues/21607#change-114658

* Author: satadru (Satadru Pramanik)
* Status: Open
* Assignee: ractor
* ruby -v: ruby 3.4.6 (2025-09-16 revision dbd83256b1) +PRISM [i686-linux]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: REQUIRED
----------------------------------------
As mentioned at https://github.com/ruby/ruby/pull/14532#issuecomment-3288983469

chronos@buppie-i686:2.23 M58 /usr/local/lib/crew/packages (master >|SPARSE)$ ruby -e "require 'concurrent-ruby' ; puts 'success'"
Segmentation fault 

This causes a segfault on i686 only on our Chromebrew/i686 systems. armv7l and x86_64 do not have this issue.

This may be linked to the update to prism 1.5.x?


Docker reproducer on our i686 ChromeOS Milestone 58 based container image:

docker run --init --platform linux/386 --rm --net=host -v $(pwd):/output -h $(hostname)-i686 --tmpfs /tmp  --ulimit "nofile=$(ulimit -Sn):$(ulimit -Hn)" -it satmandu/crewbuild:alex-i686.m58

# Note the lack of an issue with 3.4.5 with this command:
ruby -e "require 'concurrent-ruby' ; puts 'success'"

# In that container, upgrade ruby to 3.4.6:
CREW_REPO=https://github.com/chromebrew/chromebrew.git CREW_BRANCH=updater-ruby_3.4.6 crew update \
&& yes | crew upgrade

# Then run the breaking command:
ruby -e "require 'concurrent-ruby' ; puts 'success'"

# Note the segfault.


---Files--------------------------------
i686-ruby-github-action-build-job-log.txt (298 KB)


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