ios-deploy stdout Crash Reproduction

Prerequisites

• Physical iOS device (successfully reproduced with iPhone 11 Pro, iPhone 12, iPhone 13 Pro)
• ios-deploy (successfully reproduced with version 1.12.2 and a manually built version from tip of master branch)
• Xcode (successfully reproduced with 14.3.1)

Steps to Reproduce

1. Clone this repository
2. Run make build
3. Run ios-deploy with the --justlaunch flag, so a command like this:

ios-deploy \
    --id "00008030-000618513E20802E" \
    --bundle "ios/DerivedData/Build/Products/Debug-iphoneos/ios-deploy-stdout-crash.app" \
    --justlaunch

Commentary

This seems to be related to the timing between when:

• the process detaches (because of the --justlaunch flag), and
• the iOS app first tries to print to stdout (see App.swift)

The app will not crash if you do any of the following:

• comment out the line where the app tries to write to stdout, or
• launch the app via a method other than ios-deploy
• launch the app via ios-deploy without the --justlaunch flag
• use a build of ios-deploy that adds a time.sleep(10) call above this line