Same problem, iOS 26 later 0 libsystem_kernel.dylib 0x0000000243fd40cc 0x243fc9000 + 45260 __pthread_kill (in libsystem_kernel.dylib) + 8 1 libsystem_c.dylib 0x00000001a5b4ff64 0x1a5ad8000 + 491364 abort (in libsystem_c.dylib) + 124 2 libc++abi.dylib 0x000000019738f808 0x19737d000 + 75784 __cxxabiv1::__aligned_malloc_with_fallback(unsigned long) (in libc++abi.dylib) + 0 3 libc++abi.dylib 0x000000019737e46c 0x19737d000 + 5228 demangling_terminate_handler() (in libc++abi.dylib) + 280 4 libobjc.A.dylib 0x000000019728ff88 0x19725c000 + 212872 _objc_terminate() (in libobjc.A.dylib) + 172 5 libc++abi.dylib 0x000000019738ebdc 0x19737d000 + 72668 std::__terminate(void (*)()) (in libc++abi.dylib) + 16 6 libc++abi.dylib 0x0000000197392314 0x19737d000 + 86804 __cxa_get_exception_ptr (in libc++abi.dylib) + 0 7 libc++abi.dylib 0x00000001973922bc 0x19737d000 + 86716 __cxxabiv1::failed_throw(__cxxabiv1::__cxa_exception*) (in libc++abi.dylib) + 0 8 libc++abi.dylib 0x0000000197391a9c 0x19737d000 + 84636 $_0::operator()() const::'lambda'(unsigned long, std::__type_descriptor_t, std::nothrow_t const&)::__invoke(unsigned long, std::__type_descriptor_t, std::nothrow_t const&) (in libc++abi.dylib) + 0 9 libicucore.A.dylib 0x00000001ac4cdf20 0x1ac391000 + 1298208 icu::DateFormatSymbols::assignArray(icu::UnicodeString*&, int&, icu::UnicodeString const*, int) (in libicucore.A.dylib) + 88 10 libicucore.A.dylib 0x00000001ac4cdbe0 0x1ac391000 + 1297376 icu::DateFormatSymbols::copyData(icu::DateFormatSymbols const&) (in libicucore.A.dylib) + 296 11 libicucore.A.dylib 0x00000001ac4cdaa4 0x1ac391000 + 1297060 icu::DateFormatSymbols::DateFormatSymbols(icu::DateFormatSymbols const&) (in libicucore.A.dylib) + 152 12 libicucore.A.dylib 0x00000001ac4cb72c 0x1ac391000 + 1287980 icu::DateFormatSymbols::createForLocale(icu::Locale const&, UErrorCode&) (in libicucore.A.dylib) + 96 13 libicucore.A.dylib 0x00000001ac593e28 0x1ac391000 + 2108968 icu::SimpleDateFormat::construct(icu::DateFormat::EStyle, icu::DateFormat::EStyle, icu::Locale const&, UErrorCode&) (in libicucore.A.dylib) + 972 14 libicucore.A.dylib 0x00000001ac595820 0x1ac391000 + 2115616 icu::SimpleDateFormat::SimpleDateFormat(icu::DateFormat::EStyle, icu::DateFormat::EStyle, icu::Locale const&, UErrorCode&) (in libicucore.A.dylib) + 248 15 libicucore.A.dylib 0x00000001ac4b2810 0x1ac391000 + 1185808 icu::DateFormat::create(icu::DateFormat::EStyle, icu::DateFormat::EStyle, icu::Locale const&) (in libicucore.A.dylib) + 200 16 libicucore.A.dylib 0x00000001ac5cd18c 0x1ac391000 + 2343308 udat_open (in libicucore.A.dylib) + 408 17 CoreFoundation 0x000000019a2f0888 0x19a2ae000 + 272520 __ResetUDateFormat (in CoreFoundation) + 508 18 CoreFoundation 0x000000019a310900 0x19a2ae000 + 403712 __CreateCFDateFormatter (in CoreFoundation) + 324 19 Foundation 0x000000019794c364 0x197924000 + 164708 -[NSDateFormatter _regenerateFormatter] (in Foundation) + 204 20 Foundation 0x000000019821be84 0x197924000 + 9404036 -[NSDateFormatter stringForObjectValue:] (in Foundation) + 104

https://github.com/apple-oss-distributions/libiconv/tree/libiconv-64 Here is what I used to resolve this problem.

We have also encountered similar issues, and our current solution is to compile the source code of IOS16's iconv into libiconv.a library to replace libiconv.tbd. Until Apple resolves this issue, it seems like there is no better alternative.