crash at json::destroy on android

[zhaohuaxishi]

I got this crash stacktrace from bugly(something like crashlytics) report，it seems that json::destroy will crash some times. I can not reproduce this crash and have no more information.

Is there same other way to find out what cause this crash?

#00 pc 00000000001037e4 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (std::__ndk1::__tree<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::__map_value_compare<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::less<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >, true>, std::__ndk1::allocator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> > > >::destroy(std::__ndk1::__tree_node<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, void*>*)+24) [arm64-v8a]
#01 pc 00000000001037ec /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (std::__ndk1::__tree<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::__map_value_compare<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::less<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >, true>, std::__ndk1::allocator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> > > >::destroy(std::__ndk1::__tree_node<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, void*>*)+32) [arm64-v8a]
#02 pc 00000000001037ec /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (std::__ndk1::__tree<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::__map_value_compare<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::less<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >, true>, std::__ndk1::allocator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> > > >::destroy(std::__ndk1::__tree_node<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, void*>*)+32) [arm64-v8a]
#03 pc 00000000001037ec /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (std::__ndk1::__tree<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::__map_value_compare<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::less<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >, true>, std::__ndk1::allocator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> > > >::destroy(std::__ndk1::__tree_node<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, void*>*)+32) [arm64-v8a]
#04 pc 0000000000103744 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer>::json_value::destroy(nlohmann::detail::value_t)+56) [arm64-v8a]
#05 pc 0000000000103804 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (std::__ndk1::__tree<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::__map_value_compare<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::less<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >, true>, std::__ndk1::allocator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> > > >::destroy(std::__ndk1::__tree_node<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, void*>*)+56) [arm64-v8a]
#06 pc 00000000001037f8 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (std::__ndk1::__tree<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::__map_value_compare<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, std::__ndk1::less<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >, true>, std::__ndk1::allocator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> > > >::destroy(std::__ndk1::__tree_node<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer> >, void*>*)+44) [arm64-v8a]
#07 pc 0000000000103744 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer>::json_value::destroy(nlohmann::detail::value_t)+56) [arm64-v8a]
#08 pc 0000000000189cd4 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (wsrpc::Server::ServerImpl::HandleRequest(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, std::__ndk1::shared_ptr<wsrpc::Session>)+684) [arm64-v8a]
#09 pc 000000000018a5f8 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (std::__ndk1::__function::__func<std::__ndk1::__bind<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > (wsrpc::Server::ServerImpl::*)(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, std::__ndk1::shared_ptr<wsrpc::Session>), wsrpc::Server::ServerImpl*, std::__ndk1::placeholders::__ph<1> const&, std::__ndk1::placeholders::__ph<2> const&>, std::__ndk1::allocator<std::__ndk1::__bind<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > (wsrpc::Server::ServerImpl::*)(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, std::__ndk1::shared_ptr<wsrpc::Session>), wsrpc::Server::ServerImpl*, std::__ndk1::placeholders::__ph<1> const&, std::__ndk1::placeholders::__ph<2> const&> >, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > (std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, std::__ndk1::shared_ptr<wsrpc::Session>)>::operator()(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, std::__ndk1::shared_ptr<wsrpc::Session>&&)+56) [arm64-v8a]
#10 pc 000000000018dc78 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (wsrpc::Session::HandleMessage(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >)+284) [arm64-v8a]
#11 pc 00000000001aec40 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (void boost::asio::asio_handler_invoke<std::__ndk1::__bind<void (wsrpc::Session::*)(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >), std::__ndk1::shared_ptr<wsrpc::Session>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > > >(std::__ndk1::__bind<void (wsrpc::Session::*)(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >), std::__ndk1::shared_ptr<wsrpc::Session>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >&, ...)+232) [arm64-v8a]
#12 pc 00000000001aeaa8 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (void boost::asio::system_executor::dispatch<std::__ndk1::__bind<void (wsrpc::Session::*)(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >), std::__ndk1::shared_ptr<wsrpc::Session>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >, std::__ndk1::allocator<void> >(std::__ndk1::__bind<void (wsrpc::Session::*)(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >), std::__ndk1::shared_ptr<wsrpc::Session>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > >&&, std::__ndk1::allocator<void> const&) const+68) [arm64-v8a]
#13 pc 00000000001aea44 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (void boost::asio::asio_handler_invoke<boost::asio::detail::work_dispatcher<std::__ndk1::__bind<void (wsrpc::Session::*)(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >), std::__ndk1::shared_ptr<wsrpc::Session>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > > > >(boost::asio::detail::work_dispatcher<std::__ndk1::__bind<void (wsrpc::Session::*)(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >), std::__ndk1::shared_ptr<wsrpc::Session>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > > >&, ...)+64) [arm64-v8a]

[zhaohuaxishi]

here is another crash stacktrace

#00 pc 0000000000103740 /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer>::json_value::destroy(nlohmann::detail::value_t)+52) [arm64-v8a]
#01 pc 000000000010378c /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (nlohmann::basic_json<std::__ndk1::map, std::__ndk1::vector, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >, bool, long, unsigned long, double, std::__ndk1::allocator, nlohmann::adl_serializer>::json_value::destroy(nlohmann::detail::value_t)+128) [arm64-v8a]
#02 pc 00000000001834fc /system/app/RPCTVService/lib/arm64/libwsrpc-android.so (wsrpc::Message::Message(unsigned long, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >)+788) [arm64-v8a]

here is my code:

Message::Message(MessageID id, std::string content) {
    message_ = nlohmann::json::object({
            {kID, id},
            {kContent, std::move(content)},
    });
}

[jaredgrubb]

If you remove the 'std::move' does it still crash? That might give a hint at what is going on.

[zhaohuaxishi]

If you remove the 'std::move' does it still crash? That might give a hint at what is going on.

I'll try

[ilqvya]

U can try to make a forever looop in a buggy code places and check if it crashes and how often. (Probably even 1-10hours test might show something)))

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[djewsbury]

@zhaohuaxishi this is pure speculation, but I've seen something very similar before.
The callstack you quoted looks like it's coming from a background thread. You might want to check if another thread in the system has called exit(), std::terminate (etc) or is just shutting down at the same time. During the shutdown process, the standard library will start to clean up some of it's internal functionality. There is no protection in C++ if other threads are continuing to use standard library functions (even something as simple as malloc) at the same time.

I've seen similar callstacks on mobile projects. They can appear to come from libraries like this one that use a lot of standard library features (particularly strings and locale related stuff). But the root cause is another thread is just shutting down at the same time. You should make sure that all threads are terminated before shutting down, and that asio will not spin up any more working threads.

[zhaohuaxishi]

@djewsbury thank you very much for help, this seems to be a resonable explanation. how could i make sure that all threads are terminated before shutting down.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.