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how-to-catch-crash-on-ios.md

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How to catch crash on ios use xcode

Overview

Sometimes, we can't reproduce crash with local dev build, probably because your built version differs from the one QA team used. The QA team mostly used the PR build version. In this guide we will try to make a build as close as possible to the PR build for iOS.

You may notice various configuration files starting with .env (such as .env, .env.e2e, .env.jenkins) in the project. The usage of these files and environment variables injected at build time on CI will not be covered in this guide.

This guide covers how to configure Xcode to capture a crash stack trace with a physical iOS device. This allows debugging crashes by inspecting the stack trace. I will use issue #17255 as an example to reproduce and analyze a crash.

Prerequisites

  • A physical ios device (simulator is not considered in this doc)
  • Xcode installed

Steps

  1. Prepare Status Mobile
    1. Open Terminal, cd to project root
    2. Run make run-clojure in one tab
    3. Run make run-metro in a second tab
    4. Run make pod-install in a third tab
  2. Configure Xcode Project
    1. Open Xcode
    2. Open a project or file, navigate to folder path_to_root_directory_of_status_mobile/ios
    3. Set Scheme StatusImPR as current scheme
    4. Edit scheme
    5. Change Info
    6. Change Diagnostics
    7. Set automatically manage signing
  3. Update Code
    1. Edit src/status_im2/setup/dev.cljs, comment out lines 47-52
    2. Edit shadow-cljs.edn, comment out re-frisk-remote.preload, otherwise it will try to connect localhost:4567 on physical device which could slow down performance
  4. Reproduce Crash And Analyze
    1. Choose your physical ios device as target device and Run
    2. Follow reproduce steps from issue #17255 mentioned and xcode will halt at crash point
    3. Inspect stack trace to identify root cause. From the stack trace, we can locate the crash happened in api/geth_backend.go:1048(createTempDBFile) clearly!

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