SIGABRT in EventQueue::flushEvents / RawEvent destructor on Android (New Architecture, RN 0.86.2) during heavy JS-thread work

Start with EventQueue.cpp:113 and RawEvent.h:25, then trace the surrounding scheduling flow through EventBeat.cpp, RuntimeScheduler_Modern.cpp, JMessageQueueThread.cpp, and ReactInstance.cpp. Reproduce the Android foreground-and-import scenario if possible and determine why event delivery aborts; done means the failure has an identified cause and a validated fix or regression test.

Body

Description

We're seeing a native SIGABRT crash (uncaught, mechanism: signalhandler) with a stack trace entirely inside Fabric/RuntimeScheduler internals — no first-party JS frames involved. It has occurred twice on the same physical device so far.

Environment

• React Native: 0.86.2
• Expo SDK: 57
• Architecture: New Architecture (Fabric) — mandatory on this RN version
• Hermes: yes
• Platform: Android 16
• Device: Samsung Galaxy S24 FE (SM-S721B), arm64-v8a
• App version tag: 1.4.3 (build 40)

Repro context

Both occurrences happened during the same user flow:

1. App resumes from background (onResume).
2. User taps a sync/refresh action, which kicks off a data import: a network download followed by a single large SQLite transaction (expo-sqlite, withExclusiveTransactionAsync) that sequentially imports ~19 groups of records, each step logged synchronously via console.log.
3. A few milliseconds after one of the intermediate import steps logs, the process aborts.

The JS thread is doing sustained synchronous-ish work throughout the import (a tight loop of awaited SQLite operations, several dozen ms apart), right after the app comes back to the foreground — so there may be a backlog of native UI/touch events queued for delivery to JS at the same time.

Stack trace

SIGABRT: Abort

    at <unknown> (<unknown>)
    at facebook::jni::detail::FunctionWrapper<T>::call (Registration-inl.h:95)
    at facebook::jni::detail::CallWithJniConversions<T>::call (Registration-inl.h:66)
    at facebook::jni::detail::MethodWrapper<T>::dispatch (Registration-inl.h:129)
    at facebook::jni::JNativeRunnable::run (NativeRunnable.h:44)
    at std::__ndk1::function<T>::operator() (function.h:978)
    at std::__ndk1::__function::__value_func<T>::operator()[abi:ne180000] (function.h:425)
    at std::__ndk1::__function::__func<T>::operator() (function.h:308)
    at std::__ndk1::__function::__alloc_func<T>::operator()[abi:ne180000] (function.h:166)
    at std::__ndk1::__invoke_void_return_wrapper<T>::__call[abi:ne180000]<T> (invoke.h:419)
    at std::__ndk1::__invoke[abi:ne180000]<T> (invoke.h:344)
    at facebook::react::(anonymous namespace)::wrapRunnable::lambda::operator() (JMessageQueueThread.cpp:37)
    at std::__ndk1::function<T>::operator() (function.h:978)
    at std::__ndk1::__function::__value_func<T>::operator()[abi:ne180000] (function.h:425)
    at std::__ndk1::__function::__func<T>::operator() (function.h:308)
    at std::__ndk1::__function::__alloc_func<T>::operator()[abi:ne180000] (function.h:166)
    at std::__ndk1::__invoke_void_return_wrapper<T>::__call[abi:ne180000]<T> (invoke.h:419)
    at std::__ndk1::__invoke[abi:ne180000]<T> (invoke.h:344)
    at const::lambda::operator() (ReactInstance.cpp:93)
    at std::__ndk1::function<T>::operator() (function.h:978)
    at std::__ndk1::__function::__value_func<T>::operator()[abi:ne180000] (function.h:425)
    at facebook::react::RuntimeScheduler_Modern::runEventLoop (RuntimeScheduler_Modern.cpp:266)
    at facebook::react::RuntimeScheduler_Modern::runEventLoopTick (RuntimeScheduler_Modern.cpp:312)
    at facebook::react::RuntimeScheduler_Modern::executeTask (RuntimeScheduler_Modern.cpp:375)
    at facebook::react::Task::execute (Task.cpp:60)
    at std::__ndk1::function<T>::operator() (function.h:978)
    at std::__ndk1::__function::__value_func<T>::operator()[abi:ne180000] (function.h:425)
    at std::__ndk1::__function::__func<T>::operator() (function.h:308)
    at std::__ndk1::__function::__alloc_func<T>::operator()[abi:ne180000] (function.h:166)
    at std::__ndk1::__invoke_void_return_wrapper<T>::__call[abi:ne180000]<T> (invoke.h:419)
    at std::__ndk1::__invoke[abi:ne180000]<T> (invoke.h:344)
    at const::lambda::operator() (EventBeat.cpp:70)
    at std::__ndk1::function<T>::operator() (function.h:978)
    at std::__ndk1::__function::__value_func<T>::operator()[abi:ne180000] (function.h:425)
    at facebook::react::EventQueue::flushEvents (EventQueue.cpp:113)
    at std::__ndk1::vector<T>::~vector[abi:ne180000] (vector:501)
    at std::__ndk1::vector<T>::__destroy_vector::operator()[abi:ne180000] (vector:490)
    at std::__ndk1::vector<T>::__clear[abi:ne180000] (vector:920)
    at std::__ndk1::vector<T>::__base_destruct_at_end[abi:ne180000] (vector:926)
    at std::__ndk1::allocator_traits<T>::destroy[abi:ne180000]<T> (allocator_traits.h:316)
    at std::__ndk1::__destroy_at<facebook::react::RawEvent> (construct_at.h:67)
    at facebook::react::RawEvent::~RawEvent (RawEvent.h:25)
    at std::__ndk1::shared_ptr<T>::~shared_ptr[abi:ne180000] (shared_ptr.h:645)
    at std::__ndk1::__shared_weak_count::__release_shared[abi:ne180000] (shared_ptr.h:184)
    at <unknown> (<unknown>)
    at <unknown> (<unknown>)
    at <unknown> (<unknown>)
    at <unknown> (<unknown>)
    at <unknown> (<unknown>)
    at abort (<unknown>)

Notes

• Low frequency so far (2 occurrences on 1 device over 4 days), but 100% of the stack is React Native internals — no app frame to act on from our side.
• Happy to share more Sentry context (breadcrumbs, device info) if useful.