Re: [Cppcms-users] Segmentaion fault occurs to booster::aio::io_service running in booster::thread

[Artyom B. <art...@ya...>]

1st why are you using your own signal handler instead of one used by CppCMS?On segfault - can you show the backtrace of the stack from gdb when it happens.
 Artyom

 
      From: CN <cn...@fa...>
 To: cpp...@li... 
 Sent: Sunday, May 8, 2016 5:04 PM
 Subject: [Cppcms-users] Segmentaion fault occurs to booster::aio::io_service running in booster::thread
   
File "t.cpp":

#include <booster/aio/io_service.h>
#include <cppcms/service.h>
#include <boost/bind.hpp>
#include <booster/shared_ptr.h>
#include <booster/log.h>
#include <signal.h>
booster::shared_ptr<cppcms::service> this_cppcms_service;
static int caught_signal=-1;

void signal_handler(int signal_number)
{
    BOOSTER_DEBUG("begin handler");
    caught_signal=signal_number;
    this_cppcms_service->shutdown();
    BOOSTER_DEBUG("end handler");
}

class my_class {
private:
    booster::aio::io_service io_service;
public:
    void start(){
        io_service.run();
    }
    void stop(){
        io_service.stop();
    }
};


int main(int argc,char ** argv)
{
    while(true){
        try{
            this_cppcms_service.reset(new
            cppcms::service(argc,argv));
            //Install signals catchers.
            struct sigaction actions;
            memset(&actions,0,sizeof(actions));
            actions.sa_handler=signal_handler;
            int result;
            if(
                (result=sigaction(SIGTERM,&actions,NULL))
                != 0
                ||
                (result=sigaction(SIGHUP,&actions,NULL))
                != 0
            ){
                BOOSTER_ERROR("") << "sigaction()
                failed";
                exit(EXIT_FAILURE);
            }
            my_class mc;
            booster::thread
            mc_thread(boost::bind(&my_class::start,&mc));

BOOSTER_DEBUG("==1==");
            this_cppcms_service->run();
BOOSTER_DEBUG("==2==");
            mc.stop(); mc_thread.join();
BOOSTER_DEBUG("==3==");
            if(caught_signal == SIGTERM)
                return 0;
BOOSTER_DEBUG("==4==");
            //SIGHUP to reload configurations
        }
        catch(std::exception const &e){
            BOOSTER_ERROR("") << e.what();
            return 1;
        }
    }
    return 0;
}

----------

File "t.js":

{
    "service" : {
        "api" : "fastcgi",
        "socket" : "/tmp/t.sock",
        "disable_global_exit_handling":true
    },
    "daemon":{
        "enable":true,
        "lock":"/tmp/t.pid"
    },
    "logging" : {
        "level" : "debug",
        "stderr" : false,
        "syslog" : {
            "enable":true,
            "id" : "t"
        }
    }
}

--------

Commands issued:

cd /tmp
g++ -lbooster -lcppcms -lboost_system t.cpp
./a.out -c t.js
kill -TERM `cat t.pid`

--------

File "/var/log/syslog":

May  8 21:36:13 host t: ==1==:  (t.cpp:51)
May  8 21:36:36 host t: begin handler:  (t.cpp:12)
May  8 21:36:36 host t: end handler:  (t.cpp:15)
May  8 21:36:36 host t: ==2==:  (t.cpp:53)
May  8 21:36:36 host kernel: a.out[5146]: segfault at b5b5dba8 ip
b715205e sp bfad0620 error 4 in libpthread-2.19.so[b714a000+18000]


With this simple code, I get segfault at "mc.stop(); mc_thread.join();"
after issuing command "kill -TERM <pid>". Would someone please enlighten
me why?

Best regards,
CN

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