json::parse is not thread safe?

[Shawn1993]

This is the backtrace from gdb:

#0  0x00007ffff22b13f7 in raise () from /opt/compiler/gcc-4.8.2/lib/libc.so.6
#1  0x00007ffff22b27d8 in abort () from /opt/compiler/gcc-4.8.2/lib/libc.so.6
#2  0x000000000082674e in TCMalloc_CRASH_internal (dump_stats=false, filename=<value optimized out>, line_number=<value optimized out>, format=0xaee090 "Attempt to free invalid pointer: %p\n", ap=0x7fffd95edc40) at src/internal_logging.cc:77
#3  0x000000000082693b in TCMalloc_CrashReporter::PrintfAndDie (this=<value optimized out>, format=0x0) at src/internal_logging.cc:94
#4  0x000000000081f6e6 in (anonymous namespace)::InvalidFree (ptr=0x6) at src/internal_logging.h:88
#5  0x00000000008ce886 in do_free_with_callback (p=0x26f6422) at src/tcmalloc.cc:1129
#6  0x00000000008ce886 in do_free (p=0x26f6422)
#7  0x00000000008ce886 in tc_delete (p=0x26f6422)
#8  0x000000000046fec9 in deallocate (this=0x7fffd95ee498) at /home/opt/gcc-4.8.2.bpkg-r2/gcc-4.8.2.bpkg-r2/include/c++/4.8.2/ext/new_allocator.h:110
#9  _M_deallocate (this=0x7fffd95ee498) at /home/opt/gcc-4.8.2.bpkg-r2/gcc-4.8.2.bpkg-r2/include/c++/4.8.2/bits/stl_vector.h:174
#10 _M_emplace_back_aux<char> (this=0x7fffd95ee498) at /home/opt/gcc-4.8.2.bpkg-r2/gcc-4.8.2.bpkg-r2/include/c++/4.8.2/bits/vector.tcc:430
#11 emplace_back<char> (this=0x7fffd95ee498) at /home/opt/gcc-4.8.2.bpkg-r2/gcc-4.8.2.bpkg-r2/include/c++/4.8.2/bits/vector.tcc:101
#12 push_back (this=0x7fffd95ee498) at /home/opt/gcc-4.8.2.bpkg-r2/gcc-4.8.2.bpkg-r2/include/c++/4.8.2/bits/stl_vector.h:920
#13 nlohmann::detail::lexer<nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> >::get (this=0x7fffd95ee498)
    at bc_out/baidu/kg/json/output/include/nlohmann/json.hpp:6758
#14 0x00000000004709fb in nlohmann::detail::lexer<nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> >::scan_string (
    this=0x7fffd95ee498) at bc_out/baidu/kg/json/output/include/nlohmann/json.hpp:5744
#15 0x0000000000473e24 in get_token (this=0x7fffd95ee470, sax=0x7fffd95ee340) at bc_out/baidu/kg/json/output/include/nlohmann/json.hpp:7467
#16 nlohmann::detail::parser<nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> >::sax_parse_internal<nlohmann::detail::json_sax_dom_parser<nlohmann::basic_json<> > >(nlohmann::detail::json_sax_dom_parser<nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> > *) (this=0x7fffd95ee470, sax=0x7fffd95ee340) at bc_out/baidu/kg/json/output/include/nlohmann/json.hpp:7206
#17 0x0000000000479c5e in nlohmann::detail::parser<nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> >::parse (
    this=0x7fffd95ee470, strict=Unhandled dwarf expression opcode 0xf3
) at bc_out/baidu/kg/json/output/include/nlohmann/json.hpp:7130
#18 0x0000000000482894 in nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer>::parse (i=Unhandled dwarf expression opcode 0xf3
)
    at bc_out/baidu/kg/json/output/include/nlohmann/json.hpp:18870
#19 0x00000000004822b6 in textract::HttpServiceTask::entity (this=Unhandled dwarf expression opcode 0xf3
) at baidu/intelligent-search/text-extractor/src/server/http_service_task.cpp:118
#20 0x00000000004832fe in textract::HttpService::CallMethod (this=0x7fffffffd2e0, method=Unhandled dwarf expression opcode 0xf3
) at bc_out/baidu/intelligent-search/text-extractor/proto/server.pb.cc:534
#21 0x0000000000524077 in baidu::rpc::policy::ProcessHttpRequest(baidu::rpc::InputMessageBase*) () at baidu/base/baidu-rpc/src/baidu/rpc/policy/http_rpc_protocol.cpp:1336
#22 0x000000000059505a in baidu::rpc::ProcessInputMessage(void*) () at baidu/base/baidu-rpc/src/baidu/rpc/input_messenger.cpp:134
#23 0x000000000059632f in baidu::rpc::InputMessenger::OnNewMessages(baidu::rpc::Socket*) () at baidu/base/baidu-rpc/src/baidu/rpc/input_messenger.cpp:344
#24 0x00000000004bfc9d in baidu::rpc::Socket::ProcessEvent(void*) () at baidu/base/baidu-rpc/src/baidu/rpc/socket.cpp:1110
#25 0x000000000063c8da in bthread::TaskGroup::task_runner(long) () at baidu/base/bthread/bthread/task_group.cpp:293
#26 0x000000000063ceeb in bthread::TaskGroup::run_main_task() () at baidu/base/bthread/bthread/task_group.cpp:152
#27 0x0000000000639a4d in bthread::TaskControl::worker_thread(void*) () at baidu/base/bthread/bthread/task_control.cpp:73
#28 0x00007ffff7bc61c3 in start_thread () from /opt/compiler/gcc-4.8.2/lib/libpthread.so.0
#29 0x00007ffff236312d in clone () from /opt/compiler/gcc-4.8.2/lib/libc.so.6

[nlohmann]

Can you share the code that triggered this?

The library does not create shared state, so the code should be thread safe.

[nlohmann]

In order to asses your issue, we need the following information:

• What is the issue you have?

• Please describe the steps to reproduce the issue. Can you provide a small but working code example?

• What is the expected behavior?

• And what is the actual behavior instead?

• Which compiler and operating system are you using? Is it a supported compiler?

• Did you use a released version of the library or the version from the develop branch?

• If you experience a compilation error: can you compile and run the unit tests?