tools/libdynamorio.so-gdb.py causes "RuntimeError: Cannot access memory at address 0x712fd867"

I'm running DynamoRIO on a fresh Ubuntu 16.10 64bit VM in VirtualBox (Host is Windows).

I am using DynamoRIO 6.2 binary release. But the problem persists with the latest nightly 6.2.17144-0x12112de

My ~/.gdbinit file constists of these two lines:

```
add-auto-load-safe-path /home/ttarrach/Downloads/DynamoRIO-Linux-6.2.0-2/lib64/debug/libdynamorio.so.6.2-gdb.py
add-auto-load-safe-path /home/ttarrach/Downloads/DynamoRIO-Linux-6.2.17144-0x12112de/lib64/debug/libdynamorio.so.6.2-gdb.py
```

The minimal steps to reproduce this problem are:
1. start GDB: `~/Downloads/DynamoRIO-Linux-6.2.0-2$ gdb --args bin64/drrun -debug -- ls`
2. type `run` into the GDB command prompt

Here is the complete output:

```
GNU gdb (Ubuntu 7.11.90.20161005-0ubuntu1) 7.11.90.20161005-git
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
.
Find the GDB manual and other documentation resources online at:
.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from bin64/drrun...Reading symbols from /home/ttarrach/Downloads/DynamoRIO-Linux-6.2.0-2/bin64/drrun.debug...done.
done.
(gdb) run
Starting program: /home/ttarrach/Downloads/DynamoRIO-Linux-6.2.0-2/bin64/drrun -debug -- ls
process 2728 is executing new program: /home/ttarrach/Downloads/DynamoRIO-Linux-6.2.0-2/lib64/debug/libdynamorio.so.6.2
Loading gdb scripts for debugging DynamoRIO...
Traceback (most recent call last):
File "/home/ttarrach/Downloads/DynamoRIO-Linux-6.2.0-2/lib64/debug/libdynamorio.so.6.2-gdb.py", line 185, in
PrivloadBP()
File "/home/ttarrach/Downloads/DynamoRIO-Linux-6.2.0-2/lib64/debug/libdynamorio.so.6.2-gdb.py", line 151, in __init__
internal=not self.DEBUG)
RuntimeError: Cannot access memory at address 0x712fd867

```

I would expect the python script to run and not throw a memory exception. The same problems I observed in my Debian Jessie VM.