title: Can not get any information from gdb backtrace
body: <p>I have a release version server process running under linux 64-bit systems. It got crashed and left a coredump file. I use gdb to debug it like this:</p>
  
  <p>gdb svr coredump file</p>
  
  <p>And got the following backtraces:</p>
  
  <pre><code>(gdb) where
  #0  0x0000000000432691 in ?? ()
  #1  0x00002b07655a50cc in ?? ()
  #2  0x00002b07655a50c4 in ?? ()
  #3  0x00007fff9fade920 in ?? ()
  #4  0x0000000000439db3 in ?? ()
  #5  0x00007fff9fade910 in ?? ()
  #6  0x00007fff9fade910 in ?? ()
  #7  0x00007fff9fade8e0 in ?? ()
  #8  0x00000000004663e2 in ?? ()
  #9  0x00007fff9fade910 in ?? ()
  #10 0x00007fff9fade910 in ?? ()
  #11 0x00007fff9fade930 in ?? ()
  #12 0x0000000000605108 in ?? ()
  #13 0x00002b07655a274c in ?? ()
  #14 0x0000000000ebc678 in ?? ()
  #15 0x169f49f100000001 in ?? ()
  #16 0x00000000021dc6c0 in ?? ()
  #17 0x00002b07655a284c in ?? ()
  #18 0x00002b07655a27dc in ?? ()
  #19 0x00007fff9fade960 in ?? ()
  #20 0x000000000043a03b in ?? ()
  #21 0x00007fff9fade960 in ?? ()
  #22 0x0000000000994d02 in ?? ()
  #23 0x00000000000ecd57 in ?? ()
  #24 0x00002b07655a274c in ?? ()
  #25 0x00002b07655a274c in ?? ()
  #26 0x00002b07655a27dc in ?? ()
  #27 0x00007fff9fade980 in ?? ()
  #28 0x000000000060a5eb in ?? ()
  #29 0x000000009fadeb50 in ?? ()
  #30 0x00002b07655a274c in ?? ()
  #31 0x00007fff9fade9d0 in ?? ()
  #32 0x000000000060a8f0 in ?? ()
  #33 0x00007fff9fadeb50 in ?? ()
  #34 0x00007fff9fadea10 in ?? ()
  #35 0x00002b07655a274c in ?? ()
  #36 0x00007fff9fadea10 in ?? ()
  #37 0x000000009fade9d0 in ?? ()
  #38 0x00007fff9fadeb58 in ?? ()
  #39 0x0000000000000000 in ?? ()
  </code></pre>
  
  <p>The address info can not be analyzed by addr2line, what is the problem and how can I find what is the root cause of coredump?</p>
  
  <p>Thanks!</p>