Explorer crashes when looking up blocks after 1978432 (post randomx upgrade)
### Setup

explorer version (api): master-2020-05-31-f12b46c (1.1) | monero version: 0.15.0.5-17ec003c0

Raspberry Pi 4 with HDD on USB3, latest Raspberry OS.

#### Explorer started with:
taskset 1 ./xmrblocks --port 8081 --enable-pusher --enable-emission-monitor --deamon-url=HTTP://192.168.1.134:18081 --daemon-login user:pasword --mempool-info-timeout 60000 --mempool-refresh-time 30 --concurrency 1

Block explorer works fine when looking up blocks via http://192.168.1.134:8081/block/1978432 and lower.

Block explorer can lookup transactions of any block height.

### Issue

Viewing http://192.168.1.134:8081/block/1978433 and higher causes a standard "page cannot be displayed" at front end.

Systemd shows the processes crashes.

Some further debugging/log using "gdb"

#### Successful request:

> (2020-06-13 11:59:53) [INFO    ] Request: 192.168.1.131:56779 0xee1768 HTTP/1.1 GET /block/1978430
> (2020-06-13 11:59:55) [INFO    ] Response: 0xee1768 /block/1978430 200 0
> Current network info read, mempool status txs: 91

#### Error output:

> (2020-06-13 11:59:59) [INFO    ] Request: 192.168.1.131:56779 0xee1768 HTTP/1.1 GET /block/1978433
> terminate called after throwing an instance of 'std::runtime_error'
> terminate called recursively

> Thread 5 "xmrblocks" received signal SIGABRT, Aborted.
> [Switching to Thread 0x9ccfedd0 (LWP 19689)]
> __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
> 50      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
> (gdb)

### (gdb) bt full

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
        set = {__val = {0, 0, 72, 14536976, 3070089812, 3016341984, 1, 5, 0,
            0, 828923904, 2630859648, 2630860156, 2620540984, 2620540980,
            2620540976, 2620696336, 2630860228, 72, 14536976, 3059868360, 2,
            3062250860, 2630860156, 3062250876, 0, 3059868936, 0, 0,
            3060084736, 2630860080, 3061984312}}
        pid = <optimized out>
        tid = <optimized out>
        ret = <optimized out>
#1  0xb6520230 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x1d, sa_sigaction = 0x1d},
          sa_mask = {__val = {3058757516, 3070187000, 29, 3061980196,
              3059165112, 3060088048, 1512, 3060079388, 3062141088,
              3070201176, 3060941008, 2630873744, 0, 1, 72, 14536976,
              3070089812, 3016342784, 1, 5, 0, 3060088048, 3058757516, 1,
              2620536600, 3062140928, 2620696336, 7564400, 2620696336,
              2630860228, 3070114628, 29}}, sa_flags = 0, sa_restorer = 0x1}
        sigs = {__val = {32, 0 <repeats 31 times>}}
#2  0xb677a8fc in __gnu_cxx::__verbose_terminate_handler() ()
   from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
No symbol table info available.
#3  0xb67785b0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
No symbol table info available.
#4  0xb6778624 in std::terminate() ()
   from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
No symbol table info available.
#5  0xb67789dc in __cxa_rethrow ()
   from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
No symbol table info available.
#6  0xb677a8b4 in __gnu_cxx::__verbose_terminate_handler() ()
   from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
No symbol table info available.
#7  0xb67785b0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
No symbol table info available.
#8  0xb6778624 in std::terminate() ()
   from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
No symbol table info available.
#9  0xb6778990 in __cxa_throw ()
   from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
No symbol table info available.
#10 0x0073766c in __cxa_throw ()
No symbol table info available.
#11 0x00c71a6c in allocLargePagesMemory(unsigned int) ()
No symbol table info available.
#12 0x00c65654 in randomx_alloc_cache ()
No symbol table info available.
#13 0x00b899a8 in rx_slow_hash ()
No symbol table info available.
#14 0x00b2a888 in cryptonote::get_block_longhash(cryptonote::Blockchain const*, cryptonote::block const&, crypto::hash&, unsigned long long, int) ()
No symbol table info available.
#15 0x00b2aaa4 in cryptonote::get_block_longhash(cryptonote::Blockchain const*, cryptonote::block const&, unsigned long long, int) ()
No symbol table info available.
#16 0x0078cd0c in xmreg::page::show_block[abi:cxx11](unsigned long long) ()
No symbol table info available.
#17 0x0073f33c in main::{lambda(unsigned int)#4}::operator()(unsigned int) const ()
No symbol table info available.
#18 0x00748bf4 in crow::TaggedRule<unsigned long long>::operator()<main::{lambda(unsigned int)#4}>(crow::black_magic::CallHelper&&)::{lambda(crow::request const&, crow::response&, unsigned long long)#1}::operator()(crow::request const, crow::response, unsigned long long) const ()
No symbol table info available.
#19 0x0074e0f4 in std::_Function_handler<void (crow::request const&, crow::response&, unsigned long long), crow::TaggedRule<unsigned long long>::operator()<main::{lambda(unsigned int)#4}>(crow::black_magic::CallHelper&&)::{lambda(crow::request const&, crow::response&, unsigned long long)#1}>::_M_invoke(std::_Any_data c
No symbol table info available.
#20 0x009cdc60 in std::function<void (crow::request const&, crow::response&, unsigned long long)>::operator()(crow::request const&, crow::response&, unsigned long long) const ()
No symbol table info available.
#21 0x009cba18 in crow::detail::routing_handler_call_helper::call<crow::detail::routing_handler_call_helper::call_params<std::function<void (crow::request const&, crow::response&, unsigned long long)> >, 0, 1, 0, 0, crow::black_magic::S<>, crow::black_magic::S<crow::detail::routing_handler_call_helper::call_pair<unsigned long long, 0> > >::operator()(crow::detail::routing_handler_call_helper::call_params<std::function<void (crow::request const&, crow::response&, unsigned long long)> >) ()
No symbol table info available.
#22 0x009c9ef8 in crow::detail::routing_handler_call_helper::call<crow::detail::routing_handler_call_helper::call_params<std::function<void (crow::request const&, crow::response&, unsigned long long)> >, 0, 0, 0, 0, crow::black_magic::S<unsigned long long>, crow::black_magic::S<> >::operator()(crow::detail::routing_handler_call_helper::call_params<std::function<void (crow::request const&, crow::response&, unsigned long long)> >) ()
No symbol table info available.
#23 0x009bedc4 in crow::TaggedRule<unsigned long long>::handle(crow::request const&, crow::response&, crow::routing_params const&) ()
No symbol table info available.
#24 0x00782284 in crow::Router::handle(crow::request const&, crow::response&) ()
No symbol table info available.
#25 0x008e3d68 in crow::Crow<>::handle(crow::request const&, crow::response&) ()
No symbol table info available.
#26 0x008cec1c in crow::Connection<crow::SocketAdaptor, crow::Crow<>>::handle() ()
No symbol table info available.
#27 0x008b71c0 in crow::HTTPParser<crow::Connection<crow::SocketAdaptor, crow::Crow<>> >::process_message() ()
No symbol table info available.
#28 0x0089e480 in crow::HTTPParser<crow::Connection<crow::SocketAdaptor, crow::Crow<>> >::on_message_complete(http_parser*) ()
No symbol table info available.
#29 0x0077bfd8 in http_parser_execute ()
No symbol table info available.
#30 0x00883d8c in crow::HTTPParser<crow::Connection<crow::SocketAdaptor, crow::Crow<>> >::feed(char const*, int) ()
No symbol table info available.
#31 0x00869498 in crow::Connection<crow::SocketAdaptor, crow::Crow<>>::do_read()::{lambda(boost::system::error_code const&, unsigned int)#1}::operator()(boost::system::error_code const&, unsigned int) const ()
No symbol table info available.
#32 0x00918f28 in boost::asio::detail::binder2<crow::Connection<crow::SocketAdaptor, crow::Crow<>>::do_read()::{lambda(boost::system::error_code const&, unsigned int)#1}, boost::system::error_code, unsigned int>::operator()() ()
No symbol table info available.
#33 0x0090a4b0 in void boost::asio::asio_handler_invoke<boost::asio::detail::binder2<crow::Connection<crow::SocketAdaptor, crow::Crow<>>::do_read()::{lambda(boost::system::error_code const&, unsigned int)#1}, boost::system::error_code, unsigned int> >(boost::asio::detail::binder2<crow::Connection<crow::SocketAdaptor, crow::Crow<>>::do_read()::{lambda(boost::system::error_code const&, unsigned int)#1}, boost::system::error_code, unsigned int>&, ...) ()
No symbol table info available.
#34 0x008f9dac in void boost_asio_handler_invoke_helpers::invoke<boost::asio::detail::binder2<crow::Connection<crow::SocketAdaptor, crow::Crow<>>::do_read()::{lambda(boost::system::error_code const&, unsigned int)#1}, boost::system::error_code, unsigned int>, {lambda(boost::system::error_code const&, unsigned int)#1}>(boost::asio::detail::binder2<crow::Connection<crow::SocketAdaptor, crow::Crow<>>::do_read()::{lambda(boost::system::error_code const&, unsigned int)#1}, boost::system::error_code, unsigned int>&, {lambda(boost::system::error_code const&, unsigned int)#1}&) ()
No symbol table info available.
#35 0x008e6998 in void boost::asio::detail::handler_work<crow::Connection<crow::SocketAdaptor, crow::Crow<>>::do_read()::{lambda(boost::system::error_code const&, unsigned int)#1}, boost::asio::system_executor>::complete<boost::asio::detail::binder2<{lambda(boost::system::error_code const&, unsigned int)#1}, boost::system::error_code, unsigned int> >(boost::asio::detail::binder2<{lambda(boost::system::error_code const&, unsigned int)#1}, boost::system::error_code, unsigned int>&, {lambda(boost::system::error_code const&, unsigned int)#1}&) ()
No symbol table info available.
#36 0x008cf1a0 in boost::asio::detail::reactive_socket_recv_op<boost::asio::mutable_buffers_1, crow::Connection<crow::SocketAdaptor, crow::Crow<>>::do_read()::{lambda(boost::system::error_code const&, unsigned int)#1}>::do_complete(void*, boost::asio::detail::scheduler_operation*, boost::system::error_code const&, unsigned int) ()
No symbol table info available.
#37 0x0075e200 in boost::asio::detail::scheduler_operation::complete(void*, boost::system::error_code const&, unsigned int) ()
No symbol table info available.
#38 0x00761b74 in boost::asio::detail::epoll_reactor::descriptor_state::do_complete(void*, boost::asio::detail::scheduler_operation*, boost::system::error_code const&, unsigned int) ()
No symbol table info available.
#39 0x0075e200 in boost::asio::detail::scheduler_operation::complete(void*, boost::system::error_code const&, unsigned int) ()
No symbol table info available.
#40 0x007629ac in boost::asio::detail::scheduler::do_run_one(boost::asio::detail::conditionally_enabled_mutex::scoped_lock&, boost::asio::detail::scheduler_thread_info&, boost::system::error_code const&) ()
No symbol table info available.
#41 0x00762234 in boost::asio::detail::scheduler::run(boost::system::error_code&) ()
No symbol table info available.
#42 0x007630e0 in boost::asio::io_context::run() ()
No symbol table info available.
#43 0x008051ec in crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}::operator()() const ()
No symbol table info available.
#44 0x0084ae74 in void std::__invoke_impl<void, crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>(std::__invoke_other, crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}&&) ()
No symbol table info available.
#45 0x0082c338 in std::__invoke_result<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>::type std::__invoke<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>(std::__invoke_result&&, (crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}&&)...) ()
No symbol table info available.
#46 0x00938d70 in decltype (__invoke((_S_declval<0u>)())) std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >::_M_invoke<0u>(std::_Index_tuple<0u>) ()
No symbol table info available.
#47 0x00934d3c in std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >::operator()() ()
No symbol table info available.
#48 0x0092ec8c in std::__future_base::_Task_setter<std::unique_ptr<std::__future_base::_Result<void>, std::__future_base::_Result_base::_Deleter>, std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::operator()() const ()
No symbol table info available.
#49 0x0092919c in std::_Function_handler<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> (), std::__future_base::_Task_setter<std::unique_ptr<std::__future_base::_Result<void>, std::__future_base::_Result_base::_Deleter>, std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void> >::_M_invoke(std::_Any_data const&) ()
No symbol table info available.
#50 0x007cd09c in std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>::operator()() const ()
No symbol table info available.
#51 0x00771a60 in std::__future_base::_State_baseV2::_M_do_set(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*) ()
No symbol table info available.
#52 0x008136c0 in void std::__invoke_impl<void, void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*>(std::__invoke_memfun_deref, void (std::__future_base::_State_baseV2::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*&&, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*&&, bool*&&) ()
No symbol table info available.
#53 0x007edd8c in std::__invoke_result<void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*>::type std::__invoke<void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*>(void (std::__future_base::_State_baseV2::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*&&, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*&&, bool*&&) ()
No symbol table info available.
#54 0x007ccdbc in std::call_once<void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*>(std::once_flag&, void (std::__future_base::_State_baseV2::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*&&, std::func--Type <RET> for more, q to quit, c to continue without paging--
tion<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*&&, bool*&&)::{lambda()#1}::operator()() const ()
No symbol table info available.
#55 0x007ccdf4 in std::call_once<void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*>(std::once_flag&, void (std::__future_base::_State_baseV2::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*&&, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*&&, bool*&&)::{lambda()#2}::operator()() const ()
No symbol table info available.
#56 0x007cce14 in std::call_once<void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*>(std::once_flag&, void (std::__future_base::_State_baseV2::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*&&, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*&&, bool*&&)::{lambda()#2}::_FUN() ()
No symbol table info available.
#57 0xb6ed1158 in __pthread_once_slow (once_control=0xe634b4, init_routine=0x734e40 <__once_proxy@plt>) at pthread_once.c:116
        _buffer = {__routine = 0xb6ed1020 <clear_once_control>, __arg = 0xe634b4, __canceltype = -1090530518, __prev = 0x0}
        val = <optimized out>
        newval = <optimized out>
#58 0x0073ea54 in __gthread_once(int*, void (*)()) ()
No symbol table info available.
#59 0x007cced4 in void std::call_once<void (std::__future_base::_State_baseV2::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*>(std::once_flag&, void (std::__future_base::_State_baseV2::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*, bool*), std::__future_base::_State_baseV2*&&, std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>*&&, bool*&&) ()
No symbol table info available.
#60 0x00771784 in std::__future_base::_State_baseV2::_M_set_result(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>, bool) ()
No symbol table info available.
#61 0x00918664 in std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::_Async_state_impl(std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>&&)::{lambda()#1}::operator()() const ()
No symbol table info available.
#62 0x009293ec in void std::__invoke_impl<void, std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::_Async_state_impl(std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>&&)::{lambda()#1}>(std::__invoke_other, std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::_Async_state_impl(std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>&&)::{lambda()#1}&&) ()
No symbol table info available.
#63 0x00922c88 in std::__invoke_result<std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::_Async_state_impl(std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>&&)::{lambda()#1}>::type std::__invoke<std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::_Async_state_impl(std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>&&)::{lambda()#1}>(std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::_Async_state_impl(std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>&&)::{lambda()#1}&&, (std::__invoke_result&&)...) ()
No symbol table info available.
#64 0x009ca554 in decltype (__invoke((_S_declval<0u>)())) std::thread::_Invoker<std::tuple<std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::_Async_state_impl(std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>&&)::{lambda()#1}> >::_M_invoke<0u>(std::_Index_tuple<0u>) ()
No symbol table info available.
#65 0x009c4c20 in std::thread::_Invoker<std::tuple<std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::_Async_state_impl(std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>&&)::{lambda()#1}> >::operator()() ()
No symbol table info available.
#66 0x009b9be4 in std::thread::_State_impl<std::thread::_Invoker<std::tuple<std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}> >, void>::_Async_state_impl(std::tuple<crow::Server<crow::Crow<>, crow::SocketAdaptor>::run()::{lambda()#1}>&&)::{lambda()#1}> > >::_M_run() ()
No symbol table info available.
#67 0xb67a39b0 in ?? () from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
No symbol table info available.
#68 0xb6ec8494 in start_thread (arg=0x9ccfedd0) at pthread_create.c:486
        ret = <optimized out>
        start = <optimized out>
        pd = 0x9ccfedd0
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {-342992137, -1045612169, -1224742552, -1664094768, -1278632944, 338, -1090530518,
                -1664094768, 0, -1664095988, 0 <repeats 54 times>}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0,
              cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#69 0xb65e0578 in ?? () at ../sysdeps/unix/sysv/linux/arm/clone.S:73 from /lib/arm-linux-gnueabihf/libc.so.6
No locals.
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)



That log may be overkill but copy/pasted as I had it to hand.