In reply to @aidalgol:matrix.org
And why on earth does a co-op game need anticheat??

so apparently this huge combo causes a segfault:

.steamapps/common/Factorio
❯ steam-run systemd-inhibit mangohud obs-gamecapture bin/x64/factorio
mangohud terminated by signal SEGV.

But replace anything in that, and it doesn't segv.

MANGOHUD=1 steam-run systemd-inhibit obs-gamecapture bin/x64/factorio

nix shell nixpkgs#gdb -- coredumpctl debug

nix shell nixpkgs#gdb -- coredumpctl debug
bt

#0  0x0000000001ee04c0 in std::codecvt<char16_t, char, __mbstate_t>::do_unshift(__mbstate_t&, char*, char*, char*&) const ()
(gdb) bt
#0  0x0000000001ee04c0 in std::codecvt<char16_t, char, __mbstate_t>::do_unshift(__mbstate_t&, char*, char*, char*&) const ()
#1  0x00000000016695c2 in std::__detail::_BracketMatcher<std::__cxx11::regex_traits<char>, false, false>::_M_ready() ()
#2  0x00000000016710f4 in void std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_M_insert_bracket_matcher<false, false>(bool) ()
#3  0x0000000001647d29 in std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_M_atom() ()
#4  0x0000000001610916 in std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_M_alternative() ()
#5  0x000000000159239c in std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_M_disjunction() ()
#6  0x0000000001647c43 in std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_M_atom() ()
#7  0x0000000001610916 in std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_M_alternative() ()
#8  0x00000000016109cb in std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_M_alternative() ()
#9  0x00000000016109cb in std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_M_alternative() ()
#10 0x000000000159239c in std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_M_disjunction() ()
#11 0x0000000001b00bbf in std::__detail::_Compiler<std::__cxx11::regex_traits<char> >::_Compiler(char const*, char const*, std::locale const&, std::regex_constants::syntax_option_type) [clone .constprop.0] ()
#12 0x0000000001b0b4d1 in std::__cxx11::basic_regex<char, std::__cxx11::regex_traits<char> >::_M_compile(char const*, char const*, std::regex_constants::syntax_option_type) [clone .constprop.0] ()
#13 0x0000000001a86a2e in std::__cxx11::basic_regex<char, std::__cxx11::regex_traits<char> >::basic_regex(char const*, std::regex_constants::syntax_option_type) [clone .constprop.0] ()
#14 0x0000000000664bdd in __static_initialization_and_destruction_0() [clone .lto_priv.0] ()
#15 0x0000000001f89c9d in __libc_csu_init ()
#16 0x00007ffab3dd51a3 in ?? ()
#17 0x000000000060e680 in ?? ()
#18 0x00007fff00000000 in ?? ()
#19 0x00007ffab497c2e0 in ?? ()
#20 0x0000000000000000 in ?? ()

__libc_csu_init