Merged latest ArduCopter master and SITL stopped working

After merging the latest master, the compilation for sitl was successful but something is wrong when running the simulator.
This is what the console says:

ERROR: segmentation fault - aborting
Running: sh dumpstack 3923 >segv_arducopter.3923.out 2>&1

And this is what the terminal says:

Waiting for heartbeat from tcp:
MAV> EOF on TCP socket
Attempting reconnect
[Errno 111] Connection refused sleeping
[Errno 111] Connection refused sleeping
Exception in thread main_loop:
Traceback (most recent call last):
File “/usr/lib/python2.7/”, line 801, in __bootstrap_inner
File “/usr/lib/python2.7/”, line 754, in run
self.__target(*self.__args, **self.__kwargs)
File “/usr/local/bin/”, line 868, in main_loop
File “/usr/local/lib/python2.7/dist-packages/pymavlink-2.3.7-py2.7-linux-x86_64.egg/pymavlink/”, line 496, in wait_heartbeat
return self.recv_match(type=‘HEARTBEAT’, blocking=blocking, timeout=timeout)
File “/usr/local/lib/python2.7/dist-packages/pymavlink-2.3.7-py2.7-linux-x86_64.egg/pymavlink/”, line 457, in recv_match
m = self.recv_msg()
File “/usr/local/lib/python2.7/dist-packages/pymavlink-2.3.7-py2.7-linux-x86_64.egg/pymavlink/”, line 420, in recv_msg
s = self.recv(n)
File “/usr/local/lib/python2.7/dist-packages/pymavlink-2.3.7-py2.7-linux-x86_64.egg/pymavlink/”, line 1222, in recv
File “/usr/local/lib/python2.7/dist-packages/pymavlink-2.3.7-py2.7-linux-x86_64.egg/pymavlink/”, line 1206, in handle_eof
File “/usr/local/lib/python2.7/dist-packages/pymavlink-2.3.7-py2.7-linux-x86_64.egg/pymavlink/”, line 1245, in reconnect
File “/usr/local/lib/python2.7/dist-packages/pymavlink-2.3.7-py2.7-linux-x86_64.egg/pymavlink/”, line 1189, in do_connect
raise e
error: [Errno 111] Connection refused

I’m running everything on Windows Bash with Ubuntu 16.04. I updated MAVProxy to 1.8.8 and pymavlink to 2.3.7. Also, SITL works fine on my computer with previous versions of copter (for instance Copter-3.6).

Is there anything else I must update on my system in order to get it working with the master?

Thank you

Is this fault from an unmodified master?

If you install gdb then that dumpstack may work and provide more