Hi,
I'm trying to run a component on NOX that uses MongoDB. I've created an
empty application using nox-new-c-app.py and compiled it successfully.
However, when I try to run it I get a segmentation fault.
The problem seems to be in Mongo, but I don't know if the error is caused
by a bug in Mongo itself, because I've managed to use it successfully in
several projects when compiling directly. Could it be that there's an error
in the linking process using Nox? How should I link it?
src$ ./nox_core routeflowc
NOX 0.9.0(zaku)~full~beta (nox_core), compiled Feb 7 2012 15:28:53
Compiled with OpenFlow 0x01
Caught signal 11.
0x00da92be 64 (vigil::fault_handler(int)+0x4e)
0x00110400 2922598944 (__kernel_sigreturn+0x0)
0x0693f24c 256 (mongo::DBClientConnection::connect(mongo::HostAndPort
const&, std::string&)+0x2c)
0x00ae4bac 240 (vigil::routeflowc::install()+0x2ac)
0x0051f995 32 (vigil::DSO_component_context::install()+0x25)
0x0052889d 32
(boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void,
boost::_mfi::mf0<void, vigil::DSO_component_context>,
boost::_bi::list1<boost::_bi::value<vigil::DSO_component_context*> > >,
void>::invoke(boost::detail::function::function_buffer&)+0x1d)
0x005354c6 96
(vigil::Component_context::install(vigil::Component_state)+0x66)
0x00535c9f 10880 (vigil::Kernel::resolve(vigil::Component_state,
vigil::Component_state)+0x56f)
0x0053732a 48 (vigil::Kernel::resolve()+0x5a)
0x005374d3 192 (vigil::Kernel::change(vigil::Component_context*,
vigil::Component_state)+0x183)
0x00538206 2096 (vigil::Kernel::install(std::string const&,
vigil::Component_state)+0x9f6)
0x0805a158
0x0806044f 96
(boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void,
void (*)(vigil::Kernel*, std::__debug::list<std::pair<std::string,
std::__debug::list<std::string, std::allocator<std::string> > >,
std::allocator<std::pair<std::string, std::__debug::list<std::string,
std::allocator<std::string> > > > > const&,
std::__debug::vector<std::string, std::allocator<std::string> >, bool),
boost::_bi::list4<boost::_bi::value<vigil::Kernel*>,
boost::_bi::value<std::__debug::list<std::pair<std::string,
std::__debug::list<std::string, std::allocator<std::string> > >,
std::allocator<std::pair<std::string, std::__debug::list<std::string,
std::allocator<std::string> > > > > >,
boost::_bi::value<std::__debug::vector<std::string,
std::allocator<std::string> > >, boost::_bi::value<bool> > >,
void>::invoke(boost::detail::function::function_buffer&)+0x3f)
0x00e1af35
0x00132e99
Segmentation fault
The part of Makefile.am that I modified to suit Mongo is as follows:
[...]
routeflowc_la_CPPFLAGS = $(AM_CPPFLAGS) -I $(top_srcdir)/src/nox -I
$(top_srcdir)/src/nox/netapps/ -I/usr/local/include/mongo
routeflowc_la_SOURCES = routeflowc.hh routeflowc.cc
routeflowc_la_LIBADD = -lmongoclient -lboost_thread -lboost_filesystem
-lboost_program_options -lboost_system
routeflowc_la_LDFLAGS = -module -export-dynamic
[...]
The include directory of Mongo was specified in CPPFLAGS, along with
several libraries in LIBADD.
And the only part I changed in the main module file was the install method:
[...]
void routeflowc::install()
{
lg.dbg(" Install called ");
try {
mongo::DBClientConnection c;
c.connect("localhost");
cout << "Connection established" << endl;
} catch( mongo::DBException &e ) {
cout << "Exception: " << e.what() << endl;
}
}
[...]
The crash happens at the line:
c.connect("localhost");
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