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  1. #include <iostream>
  2. #include <string.h>
  3. using namespace std;
  4.  
  5. class A
  6. {
  7. 	public:
  8. 	char *token = new char[10];
  9. 	A()
  10. 	{
  11. 		strcpy(token, "hello");
  12. 	}
  13. 	~A()
  14. 	{
  15. 		if(token != NULL)
  16. 		{
  17. 			delete[] token;
  18. 			token = NULL;
  19. 		}
  20. 		cout<<"destroyed"<<endl;
  21. 	}
  22. };
  23. int main() {
  24. 	A a;
  25. 	if(1)
  26. 	{
  27. 		A b = a;
  28. 		cout<<b.token<<endl;
  29. 	}
  30. 	cout<<a.token<<endl;
  31. 	cout<<"End";
  32. }
Runtime error #stdin #stdout #stderr 0s 4468KB
comments (?)
stdin
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Standard input is empty
stdout
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hello
destroyed

End
stderr
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*** Error in `./prog': double free or corruption (fasttop): 0x000055ae728bbc20 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x70bcb)[0x2ba6c3b63bcb]
/lib/x86_64-linux-gnu/libc.so.6(+0x76f96)[0x2ba6c3b69f96]
/lib/x86_64-linux-gnu/libc.so.6(+0x7778e)[0x2ba6c3b6a78e]
./prog(+0xde1)[0x55ae72246de1]
./prog(+0xc2b)[0x55ae72246c2b]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x2ba6c3b132b1]
./prog(+0xcba)[0x55ae72246cba]
======= Memory map: ========
2ba6c2e13000-2ba6c2e36000 r-xp 00000000 fd:00 2840974                    /lib/x86_64-linux-gnu/ld-2.24.so
2ba6c2e36000-2ba6c2e3a000 rw-p 00000000 00:00 0 
2ba6c2e43000-2ba6c2e48000 rw-p 00000000 00:00 0 
2ba6c3036000-2ba6c3037000 r--p 00023000 fd:00 2840974                    /lib/x86_64-linux-gnu/ld-2.24.so
2ba6c3037000-2ba6c3038000 rw-p 00024000 fd:00 2840974                    /lib/x86_64-linux-gnu/ld-2.24.so
2ba6c3038000-2ba6c3039000 rw-p 00000000 00:00 0 
2ba6c3039000-2ba6c31ab000 r-xp 00000000 fd:00 2967755                    /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22
2ba6c31ab000-2ba6c33ab000 ---p 00172000 fd:00 2967755                    /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22
2ba6c33ab000-2ba6c33b5000 r--p 00172000 fd:00 2967755                    /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22
2ba6c33b5000-2ba6c33b7000 rw-p 0017c000 fd:00 2967755                    /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22
2ba6c33b7000-2ba6c33bb000 rw-p 00000000 00:00 0 
2ba6c33bb000-2ba6c34be000 r-xp 00000000 fd:00 2841003                    /lib/x86_64-linux-gnu/libm-2.24.so
2ba6c34be000-2ba6c36bd000 ---p 00103000 fd:00 2841003                    /lib/x86_64-linux-gnu/libm-2.24.so
2ba6c36bd000-2ba6c36be000 r--p 00102000 fd:00 2841003                    /lib/x86_64-linux-gnu/libm-2.24.so
2ba6c36be000-2ba6c36bf000 rw-p 00103000 fd:00 2841003                    /lib/x86_64-linux-gnu/libm-2.24.so
2ba6c36bf000-2ba6c36d5000 r-xp 00000000 fd:00 2840941                    /lib/x86_64-linux-gnu/libgcc_s.so.1
2ba6c36d5000-2ba6c38d4000 ---p 00016000 fd:00 2840941                    /lib/x86_64-linux-gnu/libgcc_s.so.1
2ba6c38d4000-2ba6c38d5000 r--p 00015000 fd:00 2840941                    /lib/x86_64-linux-gnu/libgcc_s.so.1
2ba6c38d5000-2ba6c38d6000 rw-p 00016000 fd:00 2840941                    /lib/x86_64-linux-gnu/libgcc_s.so.1
2ba6c38d6000-2ba6c38ee000 r-xp 00000000 fd:00 2840960                    /lib/x86_64-linux-gnu/libpthread-2.24.so
2ba6c38ee000-2ba6c3aed000 ---p 00018000 fd:00 2840960                    /lib/x86_64-linux-gnu/libpthread-2.24.so
2ba6c3aed000-2ba6c3aee000 r--p 00017000 fd:00 2840960                    /lib/x86_64-linux-gnu/libpthread-2.24.so
2ba6c3aee000-2ba6c3aef000 rw-p 00018000 fd:00 2840960                    /lib/x86_64-linux-gnu/libpthread-2.24.so
2ba6c3aef000-2ba6c3af3000 rw-p 00000000 00:00 0 
2ba6c3af3000-2ba6c3c88000 r-xp 00000000 fd:00 2841097                    /lib/x86_64-linux-gnu/libc-2.24.so
2ba6c3c88000-2ba6c3e87000 ---p 00195000 fd:00 2841097                    /lib/x86_64-linux-gnu/libc-2.24.so
2ba6c3e87000-2ba6c3e8b000 r--p 00194000 fd:00 2841097                    /lib/x86_64-linux-gnu/libc-2.24.so
2ba6c3e8b000-2ba6c3e8d000 rw-p 00198000 fd:00 2841097                    /lib/x86_64-linux-gnu/libc-2.24.so
2ba6c3e8d000-2ba6c3e91000 rw-p 00000000 00:00 0 
2ba6c4000000-2ba6c4021000 rw-p 00000000 00:00 0 
2ba6c4021000-2ba6c8000000 ---p 00000000 00:00 0 
55ae72246000-55ae72248000 r-xp 00000000 fd:00 23353346                   /home/J5CvcL/prog
55ae72447000-55ae72448000 r--p 00001000 fd:00 23353346                   /home/J5CvcL/prog
55ae72448000-55ae72449000 rw-p 00002000 fd:00 23353346                   /home/J5CvcL/prog
55ae728aa000-55ae728dc000 rw-p 00000000 00:00 0                          [heap]
7fff3f925000-7fff3f946000 rw-p 00000000 00:00 0                          [stack]
7fff3f990000-7fff3f992000 r-xp 00000000 00:00 0                          [vdso]
7fff3f992000-7fff3f994000 r--p 00000000 00:00 0                          [vvar]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
https://ideone.com/yZa4k4
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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