So, I've got an application that uses boost::asio. Due to complexity of the project, I cannot share it's source code, sadly :(
The application uses boost's asio lib to create some webservices. When attempting to use it, however, there's a sigsegv in std::type_info::operator==, which, as I'm aware, should rather work.
(gdb) backtrace
#0 0x0000000000457b79 in std::type_info::operator== (
this=0x7ffff6dadf61 <typeinfo for boost::asio::detail::typeid_wrapper<boost::asio::deadline_timer_service<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime> > >+1>, __arg=...)
at /usr/include/c++/4.8.2/typeinfo:123
#1 0x00007ffff6961911 in boost::asio::detail::service_registry::keys_match (key1=..., key2=...) at /usr/include/boost/asio/detail/impl/service_registry.ipp:94
#2 0x00007ffff69619a1 in boost::asio::detail::service_registry::do_use_service (this=0x6bd3c0, key=...,
factory=0x7ffff6988ba8 <boost::asio::detail::service_registry::create<boost::asio::deadline_timer_service<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime> > >(boost::asio::io_service&)>)
at /usr/include/boost/asio/detail/impl/service_registry.ipp:114
#3 0x00007ffff69842b6 in boost::asio::detail::service_registry::use_service<boost::asio::deadline_timer_service<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime> > > (this=0x6bd3c0)
at /usr/include/boost/asio/detail/impl/service_registry.hpp:48
The rest of backtrace ommited, as I don't think it would help anyway. When digging further into what GDB prints, that's what I get:
(gdb) frame 0
#0 0x0000000000457b79 in std::type_info::operator== (
this=0x7ffff6dadf61 <typeinfo for boost::asio::detail::typeid_wrapper<boost::asio::deadline_timer_service<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime> > >+1>, __arg=...)
at /usr/include/c++/4.8.2/typeinfo:123
123 || (__name[0] != '*' &&
(gdb) list
118 : __builtin_strcmp (__name, __arg.__name) < 0; }
119
120 bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT
121 {
122 return ((__name == __arg.__name)
123 || (__name[0] != '*' &&
124 __builtin_strcmp (__name, __arg.__name) == 0));
125 }
126 #else
127 // On some targets we can rely on type_info's NTBS being unique,
(gdb) print __name
$2 = 0xd000007ffff6afbc <Address 0xd000007ffff6afbc out of bounds>
(gdb) print __arg.__name
warning: can't find linker symbol for virtual table for `std::type_info' value
$3 = 0x7ffff6afbc60 <typeinfo name for boost::asio::detail::typeid_wrapper<boost::asio::deadline_timer_service<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime> > >> "N5boost4asio6detail14typeid_wrapperINS0_22deadline_timer_serviceINS_10posix_time5ptimeENS0_11time_traitsIS5_EEEEEE"
(gdb) print __name[0]
Cannot access memory at address 0xd000007ffff6afbc
(gdb) frame 1
#1 0x00007ffff6961911 in boost::asio::detail::service_registry::keys_match (key1=..., key2=...) at /usr/include/boost/asio/detail/impl/service_registry.ipp:94
94 if (*key1.type_info_ == *key2.type_info_)
(gdb) list
89 {
90 if (key1.id_ && key2.id_)
91 if (key1.id_ == key2.id_)
92 return true;
93 if (key1.type_info_ && key2.type_info_)
94 if (*key1.type_info_ == *key2.type_info_)
95 return true;
96 return false;
97 }
98
(gdb) print key1.type_info_
$4 = (const std::type_info *) 0x7ffff6dadf61 <typeinfo for boost::asio::detail::typeid_wrapper<boost::asio::deadline_timer_service<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime> > >+1>
(gdb) print *key1.type_info_
$5 = {_vptr.type_info = 0x6000000000006906, __name = 0xd000007ffff6afbc <Address 0xd000007ffff6afbc out of bounds>}
(gdb) print *key2.type_info_
warning: can't find linker symbol for virtual table for `std::type_info' value
$6 = warning: can't find linker symbol for virtual table for `std::type_info' value
{_vptr.type_info = 0x6906d0 <_ZTVN10__cxxabiv117__class_type_infoE@@CXXABI_1.3+16>,
__name = 0x7ffff6afbc60 <typeinfo name for boost::asio::detail::typeid_wrapper<boost::asio::deadline_timer_service<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime> > >> "N5boost4asio6detail14typeid_wrapperINS0_22deadline_timer_serviceINS_10posix_time5ptimeENS0_11time_traitsIS5_EEEEEE"}
(gdb) print key2.type_info_
$7 = (const std::type_info *) 0x7ffff6dadf60 <typeinfo for boost::asio::detail::typeid_wrapper<boost::asio::deadline_timer_service<boost::posix_time::ptime, boost::asio::time_traits<boost::posix_time::ptime> > >>
The only theory I have as to why it works like that, is that the application consists of a main binary, which is statically linked to necessary libboost*.a, and it can load .so files as plugins, each also linked with the same libboost*.a. That's the best I can guess at this point.
Anybody has any idea as to why it fails like that, and could please help me with it?
