crash in dump

[user1095108]

[user1095108]

operator<<

#0 0x7fe9fadcdb0f in __dynamic_cast /build/gcc/src/gcc/libstdc++-v3/libsupc++/dyncast.cc:95
#1 0x7fe9fae00d4c in std::locale::facet::_M_cow_shim(std::locale::id const*) const /build/gcc/src/gcc/libstdc++-v3/src/c++11/cxx11-shim_facets.cc:792
#2 0x7fe9fade1a2b in std::locale::_Impl::_M_install_facet(std::locale::id const*, std::locale::facet const*) /build/gcc/src/gcc/libstdc++-v3/src/c++98/locale.cc:384
#3 0x4a9b26 in locale<nlohmann::(anonymous namespace)::DecimalSeparator> /usr/include/c++/6.2.1/bits/locale_classes.tcc:50
#4 0x4ab19b in nlohmann::operator<<(std::ostream&, nlohmann::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator> const&) json/src/json.hpp:5832

dump()

#0 0x7f7a88ec9b0f in __dynamic_cast /build/gcc/src/gcc/libstdc++-v3/libsupc++/dyncast.cc:95
#1 0x7f7a88efcd4c in std::locale::facet::_M_cow_shim(std::locale::id const*) const /build/gcc/src/gcc/libstdc++-v3/src/c++11/cxx11-shim_facets.cc:792
#2 0x7f7a88edda2b in std::locale::_Impl::_M_install_facet(std::locale::id const*, std::locale::facet const*) /build/gcc/src/gcc/libstdc++-v3/src/c++98/locale.cc:384
#3 0x413026 in locale<nlohmann::(anonymous namespace)::DecimalSeparator> /usr/include/c++/6.2.1/bits/locale_classes.tcc:50
#4 0x4262aa in nlohmann::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator>::dump(int) const json/src/json.hpp:2204

[nlohmann]

Can you give more information:

• What input did you want to serialize?
• What system (OS, compiler) are you using?

[user1095108]

Linux i7-2720QM 4.8.10-1-ARCH #1 SMP PREEMPT Mon Nov 21 11:55:43 CET 2016 x86_64 GNU/Linux

It's just basic stuff, basically there's a crash with anything you do

json j;
j["something"] = 10;
::std::cout << j << ::std::endl;

gcc version 6.2.1 20160830 (GCC)
and c++1z flag

[user1095108]

==3109==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7ff28bfd3b10 bp 0x7ffdd5df5930 sp 0x7ffdd5df58c0 T0)

[TurpentineDistillery]

• Did you make the call from a destructor of a static object, by any chance?
• Does using the code from the latest develop branch fix the issue for you? (it does not use DecimalSeparator, which appears in the stack trace)

[user1095108]

no, it's a plain vanilla test from main(), no static functions or destructors are involved.
I'm using the latest and greatest json i.e. git checkout master

[user1095108]

wow, switching to the develop branch fixed the issue, way to go hehe. I'd think the develop branch would be the most unstable one :)

[nlohmann]

There have been a lot of fixes lately, and master contains the previous release (which was thought to be stable ;)).