How to use the addr2line command in Linux

Question

I am trying to use addr2line command in Unix but everytime it is giving the same output as    0  I am giving command as addr2line -e  a out  0x4005BDC   I got this address while running this a out executable with valgrind tool to find the memory leakage  I also compiled the source code with -g option

User · Answer

You need to specify an offset to addr2line  not a virtual address  VA    Presumably if you had address space randomization turned off  you could use a full VA  but in most modern OSes  address spaces are randomized for a new process   Given the VA 0x4005BDC by valgrind  find the base address of your process or library in memory  Do this by examining the  proc  lt PID gt  maps file while your program is running  The line of interest is the text segment of your process  which is identifiable by the permissions r-xp and the name of your program or library   Let s say that the base VA is 0x0x4005000  Then you would find the difference between the valgrind supplied VA and the base VA  0xbdc  Then  supply that to add2line   addr2line -e a out -j  text 0xbdc   And see if that gets you your line number

User · Answer

You can also use gdb instead of addr2line to examine memory address  Load executable file in gdb and print the name of a symbol which is stored at the address  16 Examining the Symbol Table    gdb  info symbol 0x4005BDC

User · Answer

That s exactly how you use it  There is a possibility that the address you have does not correspond to something directly in your source code though   For example     cat t c  include  lt stdio h gt  int main         printf  hello n        return 0      gcc -g t c   addr2line -e a out 0x400534  tmp t c 3   addr2line -e a out 0x400550    0   0x400534 is the address of main in my case  0x400408 is also a valid function address in a out  but it s a piece of code generated imported by GCC  that has no debug info   In this case    libc csu init  You can see the layout of your executable with readelf -a your exe    Other times when addr2line will fail is if you re including a library that has no debug information

User · Answer

Try adding the -f option to show the function names    addr2line -f -e a out 0x4005BDC

[c] How to use the addr2line command in Linux?

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