iOS crashes on launch in release builds only

Unity version: 2018.2.1f1 React native version: 0.57.8

When running straight out of XCode, it works fine. However, creating a release IPA file results in an immediate crash on launch. We use fastlane to generate an IPA for beta testing, so we don’t usually see this problem until then. I tested this using a blank react native project, and a blank unity project, and the crash is there. There are no useful crash logs unfortunately. Has anyone been able to publish an iOS release using this library?

Thanks

UPDATE: Setting “Strip Linked Product” to NO prevents this crash. However, this means the debug symbols are not removed and causes the app size to increase by 30-50%

FURTHER UPDATE The “Strip Linked Product” workaround does not appear to work for iOS 12.1.

Here is an issue I created in the react native repo that describes a possible solution.

Here’s the crash report:

Thread 7 name:  com.facebook.react.JavaScript
Thread 7 Crashed:
0   libsystem_kernel.dylib        	0x00000001fbbbd104 __pthread_kill + 8
1   libsystem_pthread.dylib       	0x00000001fbc3ca00 pthread_kill$VARIANT$armv81 + 296
2   libsystem_c.dylib             	0x00000001fbb14d78 abort + 140
3   libsystem_malloc.dylib        	0x00000001fbc11768 _malloc_put + 0
4   libsystem_malloc.dylib        	0x00000001fbc11924 malloc_report + 64
5   libsystem_malloc.dylib        	0x00000001fbc042d0 free + 376
6   libc++.1.dylib                	0x00000001fb1bf120 std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_string+ 258336 () + 32
7   UnityTest                     	0x0000000102de23a4 std::__1::__vector_base<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > >::~__vector_base() + 730020 (vector:451)
8   UnityTest                     	0x0000000103385214 facebook::react::ModuleRegistry::getConfig+ 6640148 (std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) + 100
9   UnityTest                     	0x0000000103394168 facebook::react::JSCNativeModules::createModule+ 6701416 (std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, OpaqueJSContext const*) + 292
10  UnityTest                     	0x0000000103393cc8 facebook::react::JSCNativeModules::getModule+ 6700232 (OpaqueJSContext const*, OpaqueJSString*) + 188
11  UnityTest                     	0x000000010338e85c OpaqueJSValue const* (*facebook::react::(anonymous namespace)::exceptionWrapMethod<&(facebook::react::JSCExecutor::getNativeModule(OpaqueJSValue*, OpaqueJSString*))>())(OpaqueJSContext const*, OpaqueJSValue*, OpaqueJSString*, OpaqueJSValue const**)::funcWrapper::call+ 6678620 (OpaqueJSContext const*, OpaqueJSValue*, OpaqueJSString*, OpaqueJSValue const**) + 104
12  JavaScriptCore                	0x0000000203350404 JSC::JSCallbackObject<JSC::JSDestructibleObject>::getOwnPropertySlot+ 574468 (JSC::JSObject*, JSC::ExecState*, JSC::PropertyName, JSC::PropertySlot&) + 340
13  JavaScriptCore                	0x0000000203a354f0 llint_slow_path_get_by_id + 2008
14  JavaScriptCore                	0x0000000203328928 llint_entry + 11528
15  JavaScriptCore                	0x000000020332d134 llint_entry + 29972
16  JavaScriptCore                	0x000000020332d134 llint_entry + 29972
17  JavaScriptCore                	0x000000020332d134 llint_entry + 29972
18  JavaScriptCore                	0x000000020332d134 llint_entry + 29972
19  JavaScriptCore                	0x000000020332d134 llint_entry + 29972
20  JavaScriptCore                	0x0000000203325a1c vmEntryToJavaScript + 300
21  JavaScriptCore                	0x000000020399bfe4 JSC::Interpreter::executeProgram+ 7176164 (JSC::SourceCode const&, JSC::ExecState*, JSC::JSObject*) + 9620
22  JavaScriptCore                	0x0000000203b77218 JSC::evaluate+ 9122328 (JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&) + 316
23  JavaScriptCore                	0x000000020334e634 JSEvaluateScript + 472
24  UnityTest                     	0x000000010336dad0 facebook::react::evaluateScript+ 6544080 (OpaqueJSContext const*, OpaqueJSString*, OpaqueJSString*) + 80
25  UnityTest                     	0x000000010338c918 facebook::react::JSCExecutor::loadApplicationScript+ 6670616 (std::__1::unique_ptr<facebook::react::JSBigString const, std::__1::default_delete<facebook::react::JSBigString const> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) + 528
26  UnityTest                     	0x0000000103392ba4 std::__1::__function::__func<facebook::react::NativeToJsBridge::loadApplication(std::__1::unique_ptr<facebook::react::RAMBundleRegistry, std::__1::default_delete<facebook::react::RAMBundleRegistry> >, std::__1::unique_ptr<facebook::react::JSBigString const, std::__1::default_delete<facebook::react::JSBigString const> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)::$_0, std::__1::allocator<facebook::react::NativeToJsBridge::loadApplication(std::__1::unique_ptr<facebook::react::RAMBundleRegistry, std::__1::default_delete<facebook::react::RAMBundleRegistry> >, std::__1::unique_ptr<facebook::react::JSBigString const, std::__1::default_delete<facebook::react::JSBigString const> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)::$_0>, void (facebook::react::JSExecutor*)>::operator()+ 6695844 (facebook::react::JSExecutor*&&) + 144
27  UnityTest                     	0x0000000103393ba8 std::__1::function<void (facebook::react::JSExecutor*)>::operator()+ 6699944 (facebook::react::JSExecutor*) const + 40
28  UnityTest                     	0x000000010330c9cc facebook::react::tryAndReturnError(std::__1::function<void + 6146508 ()> const&) + 24
29  UnityTest                     	0x0000000103302528 facebook::react::RCTMessageThread::tryFunc(std::__1::function<void + 6104360 ()> const&) + 24
30  CoreFoundation                	0x00000001fbfb6408 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 20
31  CoreFoundation                	0x00000001fbfb5d08 __CFRunLoopDoBlocks + 272
32  CoreFoundation                	0x00000001fbfb1220 __CFRunLoopRun + 2376
33  CoreFoundation                	0x00000001fbfb05b8 CFRunLoopRunSpecific + 436
34  UnityTest                     	0x00000001032e36a4 +[RCTCxxBridge runRunLoop] + 264
35  Foundation                    	0x00000001fcad73b0 __NSThread__start__ + 1040
36  libsystem_pthread.dylib       	0x00000001fbc412fc _pthread_body + 128
37  libsystem_pthread.dylib       	0x00000001fbc4125c _pthread_start + 48
38  libsystem_pthread.dylib       	0x00000001fbc44d08 thread_start + 4

[JanOwiesniak]

I had problems with iOS Ad-Hoc / App Store Builds too. The app crashed immediately without any useful logs. Setting some compiler flags in XCode worked for me. You could give it a try.

ios/rnunitydemo.xcodeproj/project.pbxproj

COPY_PHASE_STRIP = YES;
ENABLE_BITCODE = NO;
STRIP_INSTALLED_PRODUCT = NO;

[JanOwiesniak]

This is how i fixed it (in a nutshell)

1. Remove node_modules
2. Reinstall node_modues via yarn
3. Update Unity from 2018.2.14f1 to 2018.3.6f1
4. Build UnityExport
5. Patch UnityExport (https://github.com/jiulongw/swift-unity/pull/120#issuecomment-456315250, https://github.com/f111fei/react-native-unity-view/issues/79#issuecomment-465819733)
6. Update react-native-unity-view to 1.3.3
7. Update react-native to 0.57.8
8. Patch react-native moduleNames() (https://github.com/f111fei/react-native-unity-view/issues/79#issuecomment-465110101)

---

react-native info

  React Native Environment Info:
    System:
      OS: macOS 10.14
      CPU: (8) x64 Intel(R) Core(TM) i7-6920HQ CPU @ 2.90GHz
      Memory: 1.18 GB / 16.00 GB
      Shell: 3.2.57 - /bin/bash
    Binaries:
      Node: 8.15.0 - /usr/local/opt/node@8/bin/node
      Yarn: 1.13.0 - /usr/local/bin/yarn
      npm: 6.4.1 - /usr/local/opt/node@8/bin/npm
      Watchman: 4.9.0 - /usr/local/bin/watchman
    SDKs:
      iOS SDK:
        Platforms: iOS 12.1, macOS 10.14, tvOS 12.1, watchOS 5.1
      Android SDK:
        API Levels: 21, 23, 24, 25, 26, 27, 28
        Build Tools: 23.0.1, 26.0.2, 27.0.1, 27.0.3, 28.0.1, 28.0.3
        System Images: android-21 | Google APIs ARM EABI v7a, android-26 | Google APIs Intel x86 Atom
    IDEs:
      Android Studio: 3.3 AI-182.5107.16.33.5199772
      Xcode: 10.1/10B61 - /usr/bin/xcodebuild
    npmPackages:
      react: 16.5.0 => 16.5.0
      react-native: 0.57.8 => 0.57.8

---

@peterfei @mtostenson thanks again for your support.