Segfault on Fedora 43

[HellRok]

Hi,

Love the initiative, I've been jealous of these libraries and wished for something like this in Ruby!

I tried the hello world example from https://charm-ruby.dev but it's segfaulting when I try to run it on both Fedora 43 and Debian 13

I've also tried inside of Docker and gotten the same issue with docker run --rm -it --pull always --mount type=bind,src=.,dst=/app --workdir /app ruby:4.0.0 bash

require "bubbletea"
require "lipgloss"

class HelloWorld
  include Bubbletea::Model

  def initialize
    @style = Lipgloss::Style.new
      .border(:rounded)
      .border_foreground("#7D56F4")
      .padding(1, 2)
  end

  def init = [self, nil]

  def update(message)
    case message
    when Bubbletea::KeyMessage
      return [self, Bubbletea.quit] if message.to_s == "q"
    end

    [self, nil]
  end

  def view
    @style.render("Hello, Charm Ruby!\n\nPress q to quit")
  end
end

Bubbletea.run(HelloWorld.new)

crash.log

[abachman]

I'm also getting a segfault from the hello world script. I'm on macos:

❯ uname -a 
Darwin Mac 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:29:54 PDT 2025; \
  root:xnu-11417.140.69~1/RELEASE_ARM64_T8122 arm64

❯ ruby --version
ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [arm64-darwin24]

Error output:

❯ ruby charm/first-tui.rb
fatal error: bad sweepgen in refill

goroutine 17 gp=0x14000002700 m=1 mp=0x1400005a008 [running, locked to thread]:
runtime.throw({0x1429b60d8?, 0x0?})
        /usr/local/go/src/runtime/panic.go:1067 +0x38 fp=0x140000689f0 sp=0x140000689c0 pc=0x1428d99b8
runtime.(*mcache).refill(0x1005b0a68, 0x0?)
        /usr/local/go/src/runtime/mcache.go:157 +0x274 fp=0x14000068a40 sp=0x140000689f0 pc=0x1428837c4
runtime.(*mcache).nextFree(0x1005b0a68, 0x16)
        /usr/local/go/src/runtime/malloc.go:945 +0x8c fp=0x14000068a90 sp=0x14000068a40 pc=0x14287df7c
runtime.mallocgc(0x90, 0x142a16360, 0x1)
        /usr/local/go/src/runtime/malloc.go:1161 +0x470 fp=0x14000068b30 sp=0x14000068a90 pc=0x1428d52d0
runtime.newobject(...)
        /usr/local/go/src/runtime/malloc.go:1386
runtime.mapassign(0x142a069c0, 0x240001122d0, 0x14000068bf0)
        /usr/local/go/src/runtime/map.go:641 +0x94 fp=0x14000068bb0 sp=0x14000068b30 pc=0x1428d5e94
main.allocStyle({0x142b7a320, 0x0, {0x0, 0x0}, 0x0, {0x0, 0x0}, {0x0, 0x0}, 0x0, ...})
        /home/runner/work/lipgloss-ruby/lipgloss-ruby/go/style.go:15 +0x7c fp=0x14000068c20 sp=0x14000068bb0 pc=0x14299eb4c
main.lipgloss_new_style(...)
        /home/runner/work/lipgloss-ruby/lipgloss-ruby/go/style.go:29
_cgoexp_add47dcbfd29_lipgloss_new_style(0x16fd2e018)
        _cgo_gotypes.go:388 +0x50 fp=0x14000068e60 sp=0x14000068c20 pc=0x1429a8320
runtime: g 17: unexpected return pc for _cgoexp_add47dcbfd29_lipgloss_new_style called from 0x11b94cf28

[abachman]

For what it's worth, I cloned this repo, built the gem locally following the instructions in the README, and now the demos work on my machine.

I made sure I was using Ruby 4.0.0 (as specified in this project's .ruby-version) and had go 1.23.0 installed.

The first time I ran bundle exec rake compile I go an error:

❯ bundle exec rake compile
mkdir -p tmp/arm64-darwin24/lipgloss/3.4.7
cd tmp/arm64-darwin24/lipgloss/3.4.7
/Users/blah/.local/share/mise/installs/ruby/3.4.7/bin/ruby -I. ../../../../ext/lipgloss/extconf.rb
Looking for Go library in: /Users/blah/projects/charm/lipgloss-ruby/go/build/darwin_arm64
Could not find liblipgloss.a for platform darwin_arm64

Please build the Go archive first:
  cd go && go build -buildmode=c-archive -o build/darwin_arm64/liblipgloss.a .

...

So I built the Go archive, then reran bundle exec rake compile and that command was successful.

After that, this project's demos worked--e.g., bundle exec demo/layout--and after updating my original test project's Gemfile to point back to the local folder with gem "lipgloss", path: "../lipgloss-ruby", the "Your First TUI" script from charm-ruby.dev worked without segfaulting.

[ismasan]

Same issue (on macOS), and same solution: clone this repo and build the binaries manually.

[pusewicz]

Same here (on macOS), does not matter which version of Ruby (tested 4.0.0, 3.4.7, 3.4.8)

[marcoroth]

Thanks for reporting! Yeah, sadly the best solution right now is to build the native extensions locally.

I added some more context here:
marcoroth/bubbletea-ruby#1 (comment)

[marcoroth]

Just to confirm, this should work with the precompiled gem from RubyGems.org (as long as it you only require one Charm Ruby gem with a native extension):

require "bubbletea"

class HelloWorld
  include Bubbletea::Model

  def initialize
  end

  def init = [self, nil]

  def update(message)
    case message
    when Bubbletea::KeyMessage
      return [self, Bubbletea.quit] if message.to_s == "q"
    end

    [self, nil]
  end

  def view
    "Hello, Charm Ruby!\n\nPress q to quit"
  end
end

Bubbletea.run(HelloWorld.new)

or just lipgloss:

require "lipgloss"

@style = Lipgloss::Style.new
  .border(:rounded)
  .border_foreground("#7D56F4")
  .padding(1, 2)

puts @style.render("Hello, Charm Ruby!\n\nPress q to quit")

But yeah, this is obviously not the intention 🙈

[HellRok]

Yes, both of those examples work just fine!