NSSU upgrade fails on EX4300

[jgeromero]

Hello,

We are trying to use junos-eznc 2.6.6 to upgrade a fleet of EX4300s but we are encountering the following traceback:

Traceback (most recent call last):
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/nornir/core/task.py", line 99, in start
r = self.task(self, **self.params)
File "/opt/devnet/legacy_upgrades/upgrade_legacy.py", line 285, in junos_upgrade
ok, msg = sw.install(
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/jnpr/junos/utils/sw.py", line 986, in install
return self.pkgaddNSSU(remote_package, dev_timeout=timeout, **kwargs)
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/jnpr/junos/utils/sw.py", line 261, in pkgaddNSSU
rsp = self.rpc.request_package_nonstop_upgrade(
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/jnpr/junos/rpcmeta.py", line 364, in _exec_rpc
return self._junos.execute(rpc, **dec_args)
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/jnpr/junos/decorators.py", line 76, in wrapper
return function(*args, **kwargs)
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/jnpr/junos/decorators.py", line 23, in wrapper
result = function(*args, **kwargs)
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/jnpr/junos/device.py", line 834, in execute
rpc_rsp_e = self._rpc_reply(
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/jnpr/junos/decorators.py", line 117, in wrapper
rsp = function(self, *args, **kwargs)
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/jnpr/junos/device.py", line 1457, in _rpc_reply
return self._conn.rpc(rpc_cmd_e, filter_xml)._NCElement__doc
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/ncclient/manager.py", line 246, in execute
return cls(self._session,
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/ncclient/operations/third_party/juniper/rpc.py", line 52, in request
return self._request(rpc)
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/ncclient/operations/rpc.py", line 365, in _request
self._reply.parse()
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/ncclient/operations/rpc.py", line 161, in parse
root = self._root = to_ele(self._raw, huge_tree=self.huge_tree) # The element
File "/home/user/.cache/pypoetry/virtualenvs/upgrade-legacy-gUjTTpEG-py3.9/lib/python3.9/site-packages/ncclient/xml.py", line 129, in to_ele
return x if etree.iselement(x) else etree.fromstring(x.encode('UTF-8'), parser=_get_parser(huge_tree))
File "src/lxml/etree.pyx", line 3254, in lxml.etree.fromstring
File "src/lxml/parser.pxi", line 1913, in lxml.etree._parseMemoryDocument
File "src/lxml/parser.pxi", line 1800, in lxml.etree._parseDoc
File "src/lxml/parser.pxi", line 1141, in lxml.etree._BaseParser._parseDoc
File "src/lxml/parser.pxi", line 615, in lxml.etree._ParserContext._handleParseResultDoc
File "src/lxml/parser.pxi", line 725, in lxml.etree._handleParseResult
File "src/lxml/parser.pxi", line 654, in lxml.etree._raiseParseError
File "", line 123
lxml.etree.XMLSyntaxError: PCDATA invalid Char value 12, line 123, column 296

The target version we are attempting the upgrade for is 21.4R3-S2.4 any clues as why this is happening?

[apurvaraghu]

This error usually occurs when there is an invalid character as per the XML specification. Can you please provide the reproduction script that you are trying to run.