There's a count limit in python API vpp_papi.acl_add_replace().
 reply = vpp_papi.acl_add_replace(acl_index=4294967295, r=rules, count=212, tag="acl2")
 
If count is configured with 212 or more, then VPP PAPI crash is observed as follows:
Traceback (most recent call last):
File "acl_new.py", line 333, in <module>
 main()
 File "acl_new.py", line 231, in main count=212, tag="acl2")
 
File "/opt/cisco/package/sr/vpfa/lib/python2.7/site-packages/vpp_papi-1.4 py2.7.egg/vpp_papi.py", line 361, in <lambda>
 
f = lambda **kwargs: (self._call_vpp(i, msgdef, multipart, **kwargs))
 
File "/opt/cisco/package/sr/vpfa/lib/python2.7/site-packages/vpp_papi-1.4
py2.7.egg/vpp_papi.py", line 551, in _call_vpp
 
b = self.encode(msgdef, kwargs)
 
File "/opt/cisco/package/sr/vpfa/lib/python2.7/site-packages/vpp_papi-1.4
py2.7.egg/vpp_papi.py", line 267, in encode
 
size = self.__struct_type(True, msgdef, buf, offset, kwargs)
 
File "/opt/cisco/package/sr/vpfa/lib/python2.7/site-packages/vpp_papi-1.4 py2.7.egg/vpp_papi.py", line 211, in __struct_type
return self.__struct_type_encode(msgdef, buf, offset, kwargs)
 
File "/opt/cisco/package/sr/vpfa/lib/python2.7/site-packages/vpp_papi-1.4
py2.7.egg/vpp_papi.py", line 232, in __struct_type_encode kwargs[k][i])
 
IndexError: list index out of range
DEBUG:vpp_papi:Cleaning up VPP on exit
 
Increasing self.buffersize helped (self.buffersize = 20000 in vpp_papi.py) and made it work.
But this buffesize shouldn't be fixed but variable depending PAPI's message size.