Debugging crash reason when completing autocompleting type definition suggestion

[PPakalns]

Checked other resources

• This is not a bug report or feature request (Please use issues for those).
• This is a question about rustaceanvim, not rust-analyzer or Neovim.
• This is not a question about autocompletion.
• I have read the README.
• I have read the FAQ.
• I have searched for a solution using :h rustaceanvim.
• I have searched existing discussions.
• I have searched the existing issues/discussions of other plugins related to this question (if applicable).
• I have searched the existing rust-analyzer discussions (if applicable).
• I have added a very descriptive title to this question.

Description

Crash happens

Crash happens rarely when I try to complete autocomplete suggestion of some type (Rust/rustaceanvim) and type autocompletion would both complete type and add import statement at the top of the file.

I can not find in nvim log or LSP log any relevant error/warning.

Trying to debug

Neovim crashes with exit code 0213 (from octal -> 139) . Looks like SIGSEGV.

When I run neovim with gdb. I added break on exit syscall.

From backtrace found out that exit syscall is called from Event handler in
https://github.com/neovim/neovim/blob/master/src/nvim/event/proc.c

Which is called from event processed in main loop (nvim multiqueue.c).

I was expecting that neovim simply crashes, but instead it exits gracefully and I was expecting some kind of information why neovim decided to exit.

How to debug from where the event is raised and why nvim crashes.

Thank you for your help!

Example Code

No code available.

Neovim version (nvim -v)

0.12.0dev and 0.11 stable

Operating system/version

Ubuntu 24.04.2

Output of :checkhealth rustaceanvim

==============================================================================
rustaceanvim:                                                               ✅

Checking for Lua dependencies ~
- ✅ OK optional dependency nvim-dap not installed. Needed for debugging features [mfussenegger/nvim-dap](https://github.com/mfussenegger/nvim-dap)

Checking external dependencies ~
- ✅ OK rust-analyzer: found rust-analyzer 1.91.0-nightly (040a98a 2025-08-20)
- ✅ OK Cargo: found cargo 1.91.0-nightly (71eb84f21 2025-08-17)
- ✅ OK rustc: found rustc 1.91.0-nightly (040a98af7 2025-08-20)
- ✅ OK debug adapter: found codelldb 

Checking config ~
- ✅ OK No errors found in config.

Checking for conflicting plugins ~
- ✅ OK No conflicting plugins detected.

Checking for tree-sitter parser ~
- ✅ OK tree-sitter parser for Rust detected.

[PPakalns]

Will try the following approach: https://github.com/neovim/neovim/tree/master/src/nvim#tui-debugging-with-gdblldb

Somehow couldn't find these instructions previously.

[mrcjkb]

Please read the checklist items before marking them as done and submitting (I have unchecked the offending ones for you).

Rustaceanvim doesn't implement autocompletion.

All I can do to help is recommend you follow the troubleshooting guide:
https://github.com/mrcjkb/rustaceanvim?tab=readme-ov-file#stethoscope-troubleshooting

Closing.