[Cppcms-users] SV occurs at json_rpc_server::return_result(cppcms::json::array()) with aio::io_serv
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[Cppcms-users] SV occurs at json_rpc_server::return_result(cppcms::json::array()) with aio::io_service
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From: CN <cn...@fa...> - 2016-03-30 14:12:54
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Hi! I have been calling
cppcms::rpc::json_rpc_server::return_result(cppcms::json::array());
without any problem for a long time until the call is performed in the
thread that runs booster::aio::io_service::run().
I have been stuck here for a week. Please help!
Below is the simplified program in question.
A vim formatted .cpp file is also attached to this message.
class report_service
{
private:
booster::aio::io_service io_service;
void m1(booster::shared_ptr<cppcms::rpc::json_call> requester
,int size,cppcms::json::array ja)
{
requester->return_result(cppcms::json::array());
/*
This crashes too:
requester->return_result(ja);
This doesn't crash:
requester->return_result(cppcms::json::value());
*/
} //Program silently terminates here.
public:
void start(){ io_service.run(); }
void stop(){ io_service.stop(); }
void m2(booster::shared_ptr<cppcms::rpc::json_call> requester
,int size,const cppcms::json::array &ja)
{
io_service.post(boost::bind(&report_service::m1,this,requester,size,ja));
/*
This doesn't crash:
requester->return_result(cppcms::json::array());
*/
}
};
class json_app : public cppcms::rpc::json_rpc_server
{
private:
report_service *p_rs;
void json_app::doit()
{
p_rs->m2(release_call(),2,cppcms::json::array());
/*
This crashes too:
p_rs->m2(release_call(),2,cppcms::json::value());
This doesn't crash:
return_result(cppcms::json::array());
*/
}
public:
json_app(cppcms::service &s,report_service *prs)
: cppcms::rpc::json_rpc_server(s)
,p_rs(prs)
{
bind("doit",cppcms::rpc::json_method(&json_app::doit,this),method_role);
}
};
int main(int argc,char **argv)
{
cppcms::service *s=new cppcms::service(argc,argv);
report_service rs;
booster::thread t(boost::bind(&report_service::start,&rs));
s->applications_pool().mount(cppcms::create_pool<my_class>()
,cppcms::mount_point("(.*)",1)
,cppcms::app::synchronous | cppcms::app::prepopulated);
s->run();
rs.stop();
t.join();
}
Both gdb and valgrind reports that segmentation fault occurs at line#
264 in json.cpp.
Below is part of the output from valgrind:
==22832== Invalid read of size 4
==22832== at 0x4212B0D: destroy (json.cpp:264)
==22832== by 0x4212B0D: ~variant (json.cpp:135)
==22832== by 0x4212B0D: ~_data (json.cpp:286)
==22832== by 0x4212B0D: ~copy_ptr (copy_ptr.h:40)
==22832== by 0x4212B0D: cppcms::json::value::copyable::~copyable()
(json.cpp:307)
==22832== by 0x807285B: ~value (json.h:538)
==22832== by 0x807285B: _Destroy<cppcms::json::value>
(stl_construct.h:93)
==22832== by 0x807285B: __destroy<cppcms::json::value*>
(stl_construct.h:103)
==22832== by 0x807285B: _Destroy<cppcms::json::value*>
(stl_construct.h:126)
==22832== by 0x807285B: _Destroy<cppcms::json::value*,
cppcms::json::value> (stl_construct.h:151)
==22832== by 0x807285B: std::vector<cppcms::json::value,
std::allocator<cppcms::json::value> >::~vector() (stl_vector.h:424)
==22832== by 0x80B861B: booster::callback<void
()>::callable_impl<void,
boost::_bi::bind_t<std::vector<cppcms::json::value,
std::allocator<cppcms::json::value> >,
boost::_mfi::mf3<std::vector<cppcms::json::value,
std::allocator<cppcms::json::value> >, report_service,
booster::shared_ptr<cppcms::rpc::json_call>, int,
std::vector<cppcms::json::value, std::allocator<cppcms::json::value> >
>, boost::_bi::list4<boost::_bi::value<report_service*>,
boost::_bi::value<booster::shared_ptr<cppcms::rpc::json_call> >,
boost::_bi::value<int>,
boost::_bi::value<std::vector<cppcms::json::value,
std::allocator<cppcms::json::value> > > > > >::operator()()
(callback.h:219)
==22832== by 0x407CADE:
booster::aio::event_loop_impl::completion_handler::op_handler(booster::aio::event_loop_impl::completion_handler*)
(io_service.cpp:179)
==22832== by 0x407EE09: operator() (io_service.cpp:171)
==22832== by 0x407EE09:
booster::aio::event_loop_impl::run_one(booster::aio::reactor::event*,
unsigned int) (io_service.cpp:555)
==22832== by 0x407BC9E: run (io_service.cpp:232)
==22832== by 0x407BC9E: booster::aio::io_service::run()
(io_service.cpp:722)
==22832== by 0x80B660F: report_service::listen_to_report_server()
(report_service.cpp:305)
==22832== by 0x4109E84: operator() (function.h:168)
==22832== by 0x4109E84: booster_thread_func (pthread.cpp:48)
==22832== by 0x43DBEFA: start_thread (pthread_create.c:309)
==22832== by 0x4691DFD: clone (clone.S:129)
==22832== Address 0x387d0a1 is not stack'd, malloc'd or (recently)
free'd
==22832==
==22832==
==22832== Process terminating with default action of signal 11 (SIGSEGV)
==22832== Access not within mapped region at address 0x387D0A1
==22832== at 0x4212B0D: destroy (json.cpp:264)
==22832== by 0x4212B0D: ~variant (json.cpp:135)
==22832== by 0x4212B0D: ~_data (json.cpp:286)
==22832== by 0x4212B0D: ~copy_ptr (copy_ptr.h:40)
==22832== by 0x4212B0D: cppcms::json::value::copyable::~copyable()
(json.cpp:307)
==22832== by 0x807285B: ~value (json.h:538)
==22832== by 0x807285B: _Destroy<cppcms::json::value>
(stl_construct.h:93)
==22832== by 0x807285B: __destroy<cppcms::json::value*>
(stl_construct.h:103)
==22832== by 0x807285B: _Destroy<cppcms::json::value*>
(stl_construct.h:126)
==22832== by 0x807285B: _Destroy<cppcms::json::value*,
cppcms::json::value> (stl_construct.h:151)
==22832== by 0x807285B: std::vector<cppcms::json::value,
std::allocator<cppcms::json::value> >::~vector() (stl_vector.h:424)
==22832== by 0x80B861B: booster::callback<void
()>::callable_impl<void,
boost::_bi::bind_t<std::vector<cppcms::json::value,
std::allocator<cppcms::json::value> >,
boost::_mfi::mf3<std::vector<cppcms::json::value,
std::allocator<cppcms::json::value> >, report_service,
booster::shared_ptr<cppcms::rpc::json_call>, int,
std::vector<cppcms::json::value, std::allocator<cppcms::json::value> >
>, boost::_bi::list4<boost::_bi::value<report_service*>,
boost::_bi::value<booster::shared_ptr<cppcms::rpc::json_call> >,
boost::_bi::value<int>,
boost::_bi::value<std::vector<cppcms::json::value,
std::allocator<cppcms::json::value> > > > > >::operator()()
(callback.h:219)
==22832== by 0x407CADE:
booster::aio::event_loop_impl::completion_handler::op_handler(booster::aio::event_loop_impl::completion_handler*)
(io_service.cpp:179)
==22832== by 0x407EE09: operator() (io_service.cpp:171)
==22832== by 0x407EE09:
booster::aio::event_loop_impl::run_one(booster::aio::reactor::event*,
unsigned int) (io_service.cpp:555)
==22832== by 0x407BC9E: run (io_service.cpp:232)
==22832== by 0x407BC9E: booster::aio::io_service::run()
(io_service.cpp:722)
==22832== by 0x80B660F: report_service::listen_to_report_server()
(report_service.cpp:305)
==22832== by 0x4109E84: operator() (function.h:168)
==22832== by 0x4109E84: booster_thread_func (pthread.cpp:48)
==22832== by 0x43DBEFA: start_thread (pthread_create.c:309)
==22832== by 0x4691DFD: clone (clone.S:129)
==22832== If you believe this happened as a result of a stack
==22832== overflow in your program's main thread (unlikely but
==22832== possible), you can try to increase the size of the
==22832== main thread stack using the --main-stacksize= flag.
==22832== The main thread stack size used in this run was 8388608.
Thank you in advance!
Best regards,
CN
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