How to use GDB to find what function a memory address corresponds to

Question

I am using google\'s heap checker to track down a memory leak. It gives me a stack trace such as:

Leak of 21 bytes in 1 objects allocated from:                          


        

Answer 1

The original question asked how to do this in GDB:

# NOT what you want; note the lack of '*':
(gdb) info symbol 0xfde09edc
blah() + 388 in section .text of /tmp/libblah.so

# IS what you want; note the presence of '*':
(gdb) info line *0xfde09edc
Line 91 of "blah.cc"
   starts at address 0xfde09ebc 
   and ends at 0xfde09ee4 

The * is necessary for info line and shouldn't be used for info symbol.

You can also use the disassemble command with its /m flag:

(gdb) disassemble /m 0xfde09edc

... though it's rather verbose and info line gives exactly what was requested.