anchor.diff:  +
   3. and, finally, print the stack trace:
   +
  -[source,bash]
  +[source]
   ----
   (gdb) bt
   #0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x2cd7adc) at futex-internal.c:57
  
positive.code: 
  If we try to get more info about the backtrace that led to this crash we will see that there is not enough information available.
  
  [source,bash]
  ----
  (gdb) bt
  #0  0x0000000000418b5e in ?? ()
  
negative.code: 
  Alternatively, we can list the backtraces of all threads with a single command:
  
  [source]
  ----
  (gdb) thread apply all backtrace
  
  