signal SIGABRT on iOS

[YueLiXing]

Expected behavior

* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT
    frame #0: 0x00000001eba021dc libsystem_kernel.dylib`__pthread_kill + 8
    frame #1: 0x0000000224f07c60 libsystem_pthread.dylib`pthread_kill + 268
    frame #2: 0x00000001a28202d0 libsystem_c.dylib`abort + 124
    frame #3: 0x00000001a281f7c4 libsystem_c.dylib`__assert_rtn + 284
    frame #4: 0x000000010ef5c850 MallApp.debug.dylib`facebook::react::ShadowTree::commit(this=0x000000013e7f7780, transaction=0x000000016b3758b8, commitOptions=0x000000016b37589e) const at ShadowTree.cpp:251:5
    frame #5: 0x000000010e9d8f34 MallApp.debug.dylib`reanimated::ReanimatedMountHook::shadowTreeDidMount(std::__1::shared_ptr<facebook::react::RootShadowNode const> const&, double)::$_0::operator()(this=0x000000016b375b10, shadowTree=0x000000013e7f7780) const at ReanimatedMountHook.cpp:55:20
  * frame #6: 0x000000010e9d8ec4 MallApp.debug.dylib`decltype(std::declval<reanimated::ReanimatedMountHook::shadowTreeDidMount(std::__1::shared_ptr<facebook::react::RootShadowNode const> const&, double)::$_0&>()(std::declval<facebook::react::ShadowTree const&>())) std::__1::__invoke[abi:de190102]<reanimated::ReanimatedMountHook::shadowTreeDidMount(std::__1::shared_ptr<facebook::react::RootShadowNode const> const&, double)::$_0&, facebook::react::ShadowTree const&>(__f=0x000000016b375b10, __args=0x000000013e7f7780) at invoke.h:149:25
    frame #11: 0x000000010ef6692c MallApp.debug.dylib`std::__1::function<void (facebook::react::ShadowTree const&)>::operator()(this=0x000000016b375b08, __arg=0x000000013e7f7780) const at function.h:989:10
    frame #12: 0x000000010ef668cc MallApp.debug.dylib`facebook::react::ShadowTreeRegistry::visit(this=0x0000000132533960, surfaceId=1, callback=0x000000016b375b08) const at ShadowTreeRegistry.cpp:50:3
    frame #13: 0x000000010e9d70f0 MallApp.debug.dylib`reanimated::ReanimatedMountHook::shadowTreeDidMount(this=0x00000001386afd98, rootShadowNode=std::__1::shared_ptr<const facebook::react::RootShadowNode>::element_type @ 0x000000014b5fe818 strong=3 weak=1, (null)=705489526.47412503) at ReanimatedMountHook.cpp:53:22
    frame #14: 0x000000010ef9d04c MallApp.debug.dylib`facebook::react::UIManager::reportMount(this=0x0000000132533918, surfaceId=1) const at UIManager.cpp:663:20
    frame #15: 0x000000010ef27e74 MallApp.debug.dylib`facebook::react::Scheduler::reportMount(this=0x0000000132545c80, surfaceId=1) const at Scheduler.cpp:324:15
    frame #16: 0x000000010f225fec MallApp.debug.dylib`-[RCTScheduler reportMount:](self=0x000000013266adf0, _cmd="reportMount:", surfaceId=1) at RCTScheduler.mm:144:15
    frame #17: 0x000000010f2486bc MallApp.debug.dylib`__69-[RCTSurfacePresenter mountingManager:didMountComponentsWithRootTag:]_block_invoke(.block_descriptor=0x0000000121f36b80) at RCTSurfacePresenter.mm:385:7
    frame #18: 0x00000001056e0584 libdispatch.dylib`_dispatch_call_block_and_release + 32
    frame #19: 0x00000001056fa064 libdispatch.dylib`_dispatch_client_callout + 16
    frame #20: 0x000000010571af70 libdispatch.dylib`_dispatch_main_queue_drain.cold.5 + 876
    frame #21: 0x00000001056f0548 libdispatch.dylib`_dispatch_main_queue_drain + 180
    frame #22: 0x00000001056f0484 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 44
    frame #23: 0x000000019a845d90 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16
    frame #24: 0x000000019a7e94f4 CoreFoundation`__CFRunLoopRun + 1980
    frame #25: 0x000000019a7eac3c CoreFoundation`CFRunLoopRunSpecific + 572
    frame #26: 0x00000001e79c9454 GraphicsServices`GSEventRunModal + 168
    frame #27: 0x000000019d1fd274 UIKitCore`-[UIApplication _run] + 816
    frame #28: 0x000000019d1c8a28 UIKitCore`UIApplicationMain + 336
    frame #29: 0x000000019d2aa168 UIKitCore`___lldb_unnamed_symbol275673 + 104
    frame #32: 0x000000010e584f9c MallApp.debug.dylib`main at <compiler-generated>:0
    frame #33: 0x00000001c16bff08 dyld`start + 6040

Screenshots

Versions (please complete the following information):

• react: 19.0.0
• react-native: 0.79.2
• react-native-reanimated: 3.19.1
• react-native-reanimated-carousel: 4.0.3
• react-native-gesture-handler: 2.25.0

Smartphone (please complete the following information):

• Device: iPhone16 Pro
• OS: iOS 18.5

Additional context
A slideshow on the page, doing nothing, crashes shortly after

[dosubot]

Hi @YueLiXing! I'm Dosu and I’m helping the react-native-reanimated-carousel team.

This type of SIGABRT crash on iOS is often caused by issues with animation styles, especially when using zIndex values that aren't integers. React Native requires zIndex to be an integer, and using a float (for example, from an interpolation) can trigger native crashes. If you're customizing animation styles or using customAnimation, make sure to wrap your zIndex calculation with Math.round() before returning it in your style object—this has resolved similar crashes for other users (example, example).

There are also known issues when reading from shared values during component render, especially with certain versions of Reanimated and the carousel. If you see warnings about accessing .value during render, upgrading to the latest stable or canary version of react-native-reanimated-carousel has helped in some cases (details).

The crash stack trace references React Native's Fabric/new architecture internals (ShadowTree, ReanimatedMountHook), but the carousel itself doesn't directly interact with these at the JS level. Issues are most likely caused by how animated updates are sent to the native layer via Reanimated. If you're using Fabric/new architecture, double-check your Reanimated configuration and test with a minimal example to isolate the problem.

If you have custom animation logic, focus on zIndex and shared value usage. If not, try updating your dependencies and see if the crash persists. Let me know if you need help with a minimal repro or want to share your animation code for review.

To reply, just mention @dosu.

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