If that’s the one installed with asdf, running process launch should start it and hopefully make it crash. At the crash, run x/5i $pc - 8 and info registers and paste the results here.
If that’s the one you built from source, it most likely won’t crash and you’ll need to wrangle lldb manually to start the asdf one. Start lldb and run the same commands as in the listing you pasted, albeit with the paths changed to the installation provided by asdf.
You won’t believe me now 
I’ve removed the source installations from Erlang & Elixir (from /usr/local/lib) in order to install ASDF’s plugins again.
Now, after reinstalling everything works and the bus error is not there anymore..
Also when running which elixir or which erl, it returns ASDF’s directory, so I’m not running “source” installations anymore.
What have I done?
I don’t know what to say other than that it’s weird. 
I’d appreciate it if someone could reproduce this, it’s good to know the cause even if it the problem turns out solely to be a problem with asdf, brew, or similar.
I was able to fix it, thanks! 
After uninstalling elixir and erlang with brew, asdf did the trick.
Which version of Erlang were you able to get installed.
OTP 26 seems to work, but OTP 25 won’t compile for me. ASDF or from source.
It fails on “megaco_flex_scanner.erl”
OTP 26 indeed, all other versions didn’t work for me as well.
The builds of prior versions failed when calling erlc program, which was installed using homebrew and causing a bus error.
The megaco_flex_scanner seems to be relying on the flex tool, maybe try to build flex from a release archive? Link install flex
I had the same issue when upgrading to Sonoma. I use asdf to manage my versions. I’m using Elixir 1.14.4 and Erlang 26.0. Both worked fine before the upgrade, but something about the OS update (and dev tools update) broke my local installs.
For me I just had to uninstall/reinstall Elixir and Erlang to fix it.
Hi, I compile Elixir using Brew, and here are the results:
MacBook-Pro-M1 Downloads % brew install --build-from-source elixir
Warning: You are using macOS 14.
We do not provide support for this pre-release version.
It is expected behaviour that some formulae will fail to build in this pre-release version.
It is expected behaviour that Homebrew will be buggy and slow.
Do not create any issues about this on Homebrew's GitHub repositories.
Do not create any issues even if you think this message is unrelated.
Any opened issues will be immediately closed without response.
Do not ask for help from Homebrew or its maintainers on social media.
You may ask for help in Homebrew's discussions but are unlikely to receive a response.
Try to figure out the problem yourself and submit a fix as a pull request.
We will review it but may or may not accept it.
==> **Fetching** **elixir**
==> **Downloading https://raw.githubusercontent.com/Homebrew/homebrew-core/e788b647a16c227cc25ccf3fd083bddbfb511f9f/Formula/elixir.rb**
Already downloaded: /Users/abc/Library/Caches/Homebrew/downloads/6e466b379d88889da61c353c2247fbf6a8540ed87043e93e1a042247fa9b3f1b--elixir.rb
==> **Downloading https://github.com/elixir-lang/elixir/archive/v1.14.5.tar.gz**
Already downloaded: /Users/abc/Library/Caches/Homebrew/downloads/064195155f862f3de2f7dc5fc802400e2b1627c832947247945f2e7a1b130e36--elixir-1.14.5.tar.gz
==> **make**
Last 15 lines from /Users/abc/Library/Logs/Homebrew/elixir/01.make:
2023-06-16 16:11:17 +0000
make
make: *** [lib/elixir/src/elixir_parser.erl] Bus error: 10
Do not report this issue to Homebrew/brew or Homebrew/homebrew-core!
Error: You are using macOS 14.
We do not provide support for this pre-release version.
It is expected behaviour that some formulae will fail to build in this pre-release version.
It is expected behaviour that Homebrew will be buggy and slow.
Do not create any issues about this on Homebrew's GitHub repositories.
Do not create any issues even if you think this message is unrelated.
Any opened issues will be immediately closed without response.
Do not ask for help from Homebrew or its maintainers on social media.
You may ask for help in Homebrew's discussions but are unlikely to receive a response.
Try to figure out the problem yourself and submit a fix as a pull request.
We will review it but may or may not accept it.
Tried it. Flex is probably a red herring. I suspect the error is coming from erlc for me as well.
It’s probably not worth the effort to figure out assuming ElixirLS support for OTP26 is coming soon.
Yeah confirmed. You can build without megaco and then the erlc error just happens in a different spot.