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!

[marcoroth]

Hey friends, looks like @khasinski was able to crack the puzzle! We just released his pull request (#5) as part of v0.2.1 that seems to fix this issue!

We are going through the remaining gems to apply the same fix and then this should hopefully work out of the box as expected!

Please let us know if you still see any crashes, thank you!

[marcoroth]

Going to close this as we updated all gems now. Please feel free to re-open if you still see unexpected crashes, thank you! 🙏🏼