corruption when parse from string

[yqynju]

hello,
parse from raw sting

nlohmann::json::parse(R"({ "exception" : "",
                    "retr_cost" : "",
                    "li": "",
                    "q" : {"text" : "", "l" : "", "t" : [], "limit" : 15, "th" : 0,"w" : [] },
                    "tc" : {"hwseg":""},
                    "tb" : {"time_cost": "", "result" : []},
                    "tg" : {"time_cost": "", "result" : [] },
                    "tt" : { "time_cost": "", "pw" : "", "pd" : [], "result" : [] },
                    "sn" : { "time_cost": "", "result" : [] },
                    "sv" : { "time_cost": "", "result" : [] },
                    "vb" : { "time_cost": "", "result" : [] },
                    "bd" : { "time_cost":"", "result" : [] },
                    "ee" : { "time_cost" : "", "result" : [] },
                    "bd" : { "time_cost" : "", "result" : [] },
                    "hh" : { "time_cost" : "", "result" : [] }})"

with 64 thread, it come the corrupetion with flowwing:

/usr/include/c++/4.8.2/ext/new_allocator.h:120
/usr/include/c++/4.8.2/bits/stl_map.h:465
json-for-modern-cpp/include/nlohmann/detail/input/json_sax.hpp:221
json-for-modern-cpp/include/nlohmann/detail/input/parser.hpp:120
/usr/include/c++/4.8.2/bits/basic_string.h:539
src/server/server_core.cpp:133

version:
json-for-modern-cpp-3.6.1

[yqynju]

#0 0x00002afebb2d4417 in raise () from /lib64/libc.so.6
#1 0x00002afebb2d5c48 in abort () from /lib64/libc.so.6
#2 0x00002afebb314647 in __libc_message () from /lib64/libc.so.6
#3 0x00002afebb31a1d4 in malloc_printerr () from /lib64/libc.so.6
#4 0x00002afebb31e037 in _int_malloc () from /lib64/libc.so.6
#5 0x00002afebb31f8bc in malloc () from /lib64/libc.so.6
#6 0x00002afebaade1bd in operator new(unsigned long) () from /lib64/libstdc++.so.6
#7 0x0000556f70198d59 in allocate (__n=1, this=)
at /usr/include/c++/4.8.2/ext/new_allocator.h:104
#8 _M_get_node (this=) at /usr/include/c++/4.8.2/bits/stl_tree.h:370
#9 _M_create_node<const std::piecewise_construct_t&, std::tuple<const std::basic_string<char, std::char_traits, std::allocator >&>, std::tuple<> > (this=0x2b012c0245b0)
at /usr/include/c++/4.8.2/bits/stl_tree.h:403
#10 std::_Rb_tree<std::string, std::pair<std::string const, nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> >, std::_Select1st<std::pair<std::string const, nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> > >, std::lessstd::string, std::allocator<std::pair<std::string const, nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> > > >::_M_emplace_hint_unique<std::piecewise_construct_t const&, std::tuple<std::string const&>, std::tuple<> >(std::_Rb_tree_const_iterator<std::pair<std::string const, nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> > >, std::piecewise_construct_t const&, std::tuple<std::string const&>&&, std::tuple<>&&) (
this=this@entry=0x2b012c0245b0, __pos=..., __pos@entry=...) at /usr/include/c++/4.8.2/bits/stl_tree.h:1669
#11 0x0000556f701a96bc in std::map<std::string, nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer>, std::lessstd::string, std::allocator<std::pair<std::string const, nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> > > >::operator[] (this=0x2b012c0245b0, __k="result")
at /usr/include/c++/4.8.2/bits/stl_map.h:465
#12 0x0000556f701a9fe2 in key (val="result", this=0x2b01be622f80)
at /home/yqy/com/thirdparty/json-for-modern-cpp/include/nlohmann/detail/input/json_sax.hpp:221
#13 nlohmann::detail::parser<nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> >::sax_parse_internal<nlohmann::detail::json_sax_dom_parser<nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> > > (this=0x2b01be623160, sax=sax@entry=0x2b01be622f80)
at com/thirdparty/json-for-modern-cpp/include/nlohmann/detail/input/parser.hpp:405
#14 0x0000556f701af8f7 in nlohmann::detail::parser<nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> >::parse (
this=this@entry=0x2b01be623160, strict=strict@entry=true, result=...)
at com/thirdparty/json-for-modern-cpp/include/nlohmann/detail/input/parser.hpp:116

[nlohmann]

What do you mean with "with 64 thread"?

[yqynju]

app runs parallel, which contains 64 threads.

it come with the above corruption. or below corruption:

#0 nlohmann::detail::serializer<nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> >::dump_escaped (this=0x7fdc106f6f90, s=..., ensure_ascii=false)
at json-for-modern-cpp/include/nlohmann/detail/output/serializer.hpp:312
#1 0x000055dd147dc413 in nlohmann::detail::serializer<nlohmann::basic_json<std::map, std::vector, std::string, bool, long, unsigned long, double, std::allocator, nlohmann::adl_serializer> >::dump (this=0x7fdc106f6f90, val=...,
pretty_print=, ensure_ascii=, indent_step=0, current_indent=0) at json-for-modern-cpp/include/nlohmann/detail/output/serializer.hpp:162
#2 0x000055dd147d7702 in dump (error_handler=nlohmann::detail::strict, ensure_ascii=false, indent_char=32 ' ', indent=-1, this=0x7fdc106f7358)

[nlohmann]

The above code only contains a call to parse, but your stack trace calls dump. Can you please share a minimal working example?

[nlohmann]

@yqynju Can you provide more information on this issue? If it only occurs in multi-threaded environments, can you maybe run it with TSAN?