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fix segfault on linux with static Ruby 3.2, 3.3, 3.4#105

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fix segfault on linux with static Ruby 3.2, 3.3, 3.4#105
indirect wants to merge 1 commit intoruby:masterfrom
indirect:fix-segfault

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@indirect indirect commented Oct 30, 2025 •
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Without this patch, IO.console triggers a segfault in statically compiled Ruby on linux. I tested using Docker images ubuntu:latest and homebrew/brew:latest.

Reproduction steps:
0. (optional) Install rv by running curl --proto '=https' --tlsv1.2 -LsSf https://github.com/spinel-coop/rv/releases/download/v0.2.0/rv-installer.sh | sh.

  1. Install Ruby from rv-ruby releases. With rv installed, you can do this by running rv ruby install 3.4.7; eval "$(rv shell init bash)".
  2. Check out io-console repository.
  3. Run bundle install; bundle exec rake compile; bundle exec rake test.

Expected output:

31 tests, 117 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed

Actual output (without patch):

/src/test/io/console/test_io_console.rb:441: [BUG] Segmentation fault at 0x0000000000000008
ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [aarch64-linux]

-- Control frame information -----------------------------------------------
c:0010 p:---- s:0042 e:000041 CFUNC  :console
c:0009 p:0072 s:0038 e:000037 BLOCK  /src/test/io/console/test_io_console.rb:441 [FINISH]
c:0008 p:---- s:0035 e:000034 CFUNC  :class_eval
c:0007 p:0063 s:0031 e:000030 TOP    /src/test/io/console/test_io_console.rb:65 [FINISH]
c:0006 p:---- s:0028 e:000027 CFUNC  :require
c:0005 p:0054 s:0023 e:000022 BLOCK  /home/linuxbrew/.data/rv/rubies/ruby-3.4.7/lib/ruby/3.4.0/bundled_gems.rb:82
c:0004 p:0063 s:0016 e:000015 BLOCK  /home/linuxbrew/.gem/ruby/3.4.7/gems/rake-13.3.0/lib/rake/rake_test_loader.rb:21 [FINISH]
c:0003 p:---- s:0011 e:000010 CFUNC  :select
c:0002 p:0012 s:0007 E:001018 EVAL   /home/linuxbrew/.gem/ruby/3.4.7/gems/rake-13.3.0/lib/rake/rake_test_loader.rb:6 [FINISH]
c:0001 p:0000 s:0003 E:001600 DUMMY  [FINISH]

Actual output (with patch):

Loaded suite /home/linuxbrew/.gem/ruby/3.4.7/gems/rake-13.3.0/lib/rake/rake_test_loader
Started
Finished in 4.224777833 seconds.
-----------------------------------------------------------------------------------------
31 tests, 117 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed
-----------------------------------------------------------------------------------------
7.34 tests/s, 27.69 assertions/s

@indirect
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indirect commented Nov 7, 2025

I was able to work around this issue by removing --with-static-linked-ext from my builds of Ruby: spinel-coop/rv-ruby#16. While that resolves the segfault, I still believe it should be possible to load the io-console gem even if Ruby has statically linked the default gem version of io-console.

nobu added a commit to nobu/ruby that referenced this pull request Dec 13, 2025
@nobu
Do not export InitVM functions
f610a71 
Fix ruby/io-console#105.
k0kubun added a commit to ruby/ruby that referenced this pull request Dec 16, 2025
@k0kubun
merge revision(s) bc2a8a0, c26057e: [Backport #21779]
252b718 
	[PATCH] [Bug #21779] Uniquify `InitVM` functions as well as `Init`

	Avoid possible name conflict when `--with-static-linked-ext`.

	[PATCH] [Bug #21779] Do not export InitVM functions

	Fix ruby/io-console#105.
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