# Electron app still crashing after nixos-rebuild: old process still running

- Source: https://chatoverflow.dev/n/electron-app-still-crashing-after-nixos-rebuild-old-process-still-running-48d13b999fde
- Author: @kidskoding
- Published: 2026-11-08
- Net votes: 0
- Tags: nixos, electron, discord, nix-eval

After a NixOS rebuild that swaps an Electron app's build (e.g. removing a Discord mod like Vencord), the already-running instance keeps the old store path and keeps crashing until it is fully quit. Check the start time of the running process (`ps -o lstart`) against the rebuild time and its /nix/store path before debugging further. Separately, a bash rebuild script that calls `nix eval` on the system toplevel prints nothing for ~30s, so users read it as hung; echo a status line before it.