General
cancel
Showing results for 
Search instead for 
Did you mean: 

Run time issues with STL string class

sumanth_2
Occasional Contributor

Run time issues with STL string class

Hi,

I'm facing some problem while executing C++ binary.

The below is the environment under which our code is being compiled and being run:

OS :

- Red Hat Enterprise Linux ES release 4 (Nahant Update 4)

Thread model:

- posix

gcc version :

3.4.3 20041212 (Red Hat 3.4.3-9.EL4)

glibc :

glibc-2.3.4-2.25

glibc-devel-2.3.4-2.25

glibc-kernheaders-2.4-9.1.98.EL

glibc-2.3.4-2.25

glibc-devel-2.3.4-2.25

compat-glibc-2.3.2-95.30

glibc-utils-2.3.4-2.25

glibc-common-2.3.4-2.25

compat-glibc-headers-2.3.2-95.30

glibc-headers-2.3.4-2.25

glibc-profile-2.3.4-2.25

compat-glibc-2.3.2-95.30



and the below is the code snippet. (it is not actual code, just a kind of example like our code ).

Code Snippet:

class A

{

public:

A() : namePresent(false) {};



virtual void setName(const string& name)

{

this -> name = name;

namePresent = true;

}

virtual const string& getName()

{

return name;

}



private:

string name;

bool namePresent;

};



class B : public A

{



public:

B() : A(){

.... // some other initialisation.

}



};



class C : public B

{



public:

C(const string &name1) : B()

{

------

-------



initialise(name1);

------

-------





}



int initialise(const string &name1)

{

------

-------

setName(name1)

--------



}





void setName(const string& name2)

{



A :: setName(name2);



..... // some code

.....

}

}



main()

{

C* temp = new C("XYZ");

}

This is an example to show the hierarchy of the class inheritence that is there in our code.


We have been able to create an pointer object of the class C and also been able to call the setName function of the class A for the first object.

But for the second time(rather second pointer object) it is giving the core dump. The below is the gdb of the core:

#0 0xffffe405 in __kernel_vsyscall ()

(gdb) bt

#0 0xffffe405 in __kernel_vsyscall ()

#1 0x005007a5 in raise () from /lib/tls/libc.so.6

#2 0x00502209 in abort () from /lib/tls/libc.so.6

#3 0x0053471a in __libc_message () from /lib/tls/libc.so.6

#4 0x0053afbf in _int_free () from /lib/tls/libc.so.6

#5 0x0053b33a in free () from /lib/tls/libc.so.6

#6 0x0099ffd1 in operator delete () from /usr/lib/libstdc++.so.6

#7 0x00981cff in std::string::_Rep::_M_destroy () from /usr/lib/libstdc++.so.6

#8 0x00981e11 in std::string::assign () from /usr/lib/libstdc++.so.6

#9 0x00981e61 in std::string::operator= () from /usr/lib/libstdc++.so.6

#10 0x08158337 in mt::Task::setName (this=0x8234eb0, name=@0xffff9f90) at Task.cpp:38

#11 0x081600da in timer::TimerManager::setNameNew (this=0x8234eb0, p_name2=@0xffff9f90) at Timers.cpp:471

#12 0x0815fe58 in timer::TimerManager::initialise (this=0x8234eb0, name1=@0xffff9f90) at Timers.cpp:431

#13 0x0815edd3 in TimerManager (this=0x8234eb0, p_timerThreadsCount=1, p_name1=@0xffff9f90, p_useSignals=true,

p_timeoutProcessorFactory=0x0) at Timers.cpp:326

#14 0x0805c4a6 in VoiceFilter::initialiseInterface (this=0x8201420) at VoiceFilter.ecpp:653

#15 0x08070fe6 in VoiceFilterBase::initialise (this=0x8201420) at VoiceFilterBase.ecpp:302

#16 0x0806498f in main (argc=2, argv=0x8201420) at main.ecpp:62

If we set the environment variable MALLOC_CHECK_ to 1 then we donâ t see any such issue and binary works fine.

Interestingly we randomly see this behavior.

Any help very much appreciated.

( The same is attached here in a file as well)
Regards,
Sumanth