Flutter FFI native crash (SIGSEGV/SIGBUS) with Swiss Ephemeris / Jyotish package on Android ARM64 after successful initialization

I am facing random native crashes on Android when using the jyotish Flutter package (Swiss Ephemeris based).

The crash happens even when only initializing the package, without calling any calculation functions.

Environment:

Flutter: stable channel

Android: 11

Device: Xiaomi davinciin

ABI: arm64-v8a

Package: jyotish: 2.5.0

I already:

rebuilt libswisseph.so

linked math library (-lm)

fixed architecture mismatch

tested sequential execution only

removed concurrent calls

tested with minimal initialization

But the app still crashes randomly with native SIGSEGV/SIGBUS errors.

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Current behavior:

Sometimes initialization succeeds

Sometimes app fully loads

Sometimes first calculation works

Then random native crash occurs later

Even if I only do:

final j = Jyotish(); final ephePath = await copyEpheFiles(); await j.initialize(   ephemerisPath: ephePath, );

the app may still crash later.

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Minimal reproduction:

void main() async {   WidgetsFlutterBinding.ensureInitialized();   try {     final j = Jyotish();     final ephePath = await copyEpheFiles();     print("EPHE PATH: $ephePath");     await j.initialize(       ephemerisPath: ephePath,     );     print("JYOTISH INIT SUCCESS");   } catch (e, st) {     print(e);     print(st);   }   runApp(     const MaterialApp(       home: Scaffold(         body: Center(           child: Text("TEST"),         ),       ),     ),   ); }

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Ephemeris files:

copied from assets to application documents directory

all .se1 files provided

Example path:

/data/user/0/com.garden.gardenmakeover/app_flutter/ephe

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Custom build command used for libswisseph.so:

aarch64-linux-android21-clang.cmd ^ -shared ^ -fPIC ^ -O0 ^ -g ^ -fno-builtin ^ -DANDROID ^ -o libswisseph.so ^ compat.c ^ swecl.c ^ swedate.c ^ swehel.c ^ swehouse.c ^ swejpl.c ^ swemmoon.c ^ swemplan.c ^ sweph.c ^ swephlib.c ^ -lm

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Earlier issues already solved:

Wrong architecture: EM_X86_64 instead of EM_AARCH64 Missing math linkage: cannot locate symbol "asin"

After fixing those, crashes still happen.

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Typical crash logs:

Fatal signal 11 (SIGSEGV), code 2 (SEGV_ACCERR)

or

Fatal signal 7 (SIGBUS), code 1 (BUS_ADRALN)

Example stack:

#00 pc ... (sincos+4) #01 pc ... (sincos+32)

or

F/libc: Fatal signal 11 (SIGSEGV) fault addr 0x7c08200000

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Important observations:

crash is random

note that this package has one bug in setup mentioned in repo while setup

same code sometimes works perfectly

crash occurs even without calculations

hot reload/hot restart increases crash frequency

app may fully render UI before crashing