[Pkg-matrix-maintainers] error starting matrix-synapse from -backports

[Phil Morrell]

(please CC, I'm not subscribed)

I'm mailing the list rather than filing a bug report because it may be
user error, but I get the below stacktrace when trying to start the
matrix-synapse service from stretch-backports on armhf.

I can't actually see much from Matrix here, so it may be a plain
python-twisted bug, but can anyone else reproduce the error? I haven't
got anything custom like pip installed, but I did upgrade from a
homemade backport of 0.30 (though only the config & database remains).

---

Nov 03 08:29:43 puppet systemd[1]: Starting Synapse Matrix homeserver...
Nov 03 08:29:49 puppet python[12654]: Traceback (most recent call last):
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
Nov 03 08:29:49 puppet python[12654]:     "__main__", fname, loader, pkg_name)
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
Nov 03 08:29:49 puppet python[12654]:     exec code in run_globals
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/synapse/app/homeserver.py", line 26, in <module>
Nov 03 08:29:49 puppet python[12654]:     from twisted.internet import defer, reactor
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/reactor.py", line 38, in <module>
Nov 03 08:29:49 puppet python[12654]:     from twisted.internet import default
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/default.py", line 56, in <module>
Nov 03 08:29:49 puppet python[12654]:     install = _getInstallFunction(platform)
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/default.py", line 44, in _getInstallFunction
Nov 03 08:29:49 puppet python[12654]:     from twisted.internet.epollreactor import install
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/epollreactor.py", line 24, in <module>
Nov 03 08:29:49 puppet python[12654]:     from twisted.internet import posixbase
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/posixbase.py", line 18, in <module>
Nov 03 08:29:49 puppet python[12654]:     from twisted.internet import error, udp, tcp
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/udp.py", line 53, in <module>
Nov 03 08:29:49 puppet python[12654]:     from twisted.internet import base, defer, address
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line 27, in <module>
Nov 03 08:29:49 puppet python[12654]:     from twisted.internet._resolver import (
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/_resolver.py", line 25, in <module>
Nov 03 08:29:49 puppet python[12654]:     from twisted.internet.address import IPv4Address, IPv6Address
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/address.py", line 23, in <module>
Nov 03 08:29:49 puppet python[12654]:     class IPv4Address(object):
Nov 03 08:29:49 puppet python[12654]:   File "/usr/lib/python2.7/dist-packages/twisted/internet/address.py", line 37, in IPv4Address
Nov 03 08:29:49 puppet python[12654]:     type = attr.ib(validator=attr.validators.in_(["TCP", "UDP"]))
Nov 03 08:29:49 puppet python[12654]: AttributeError: 'module' object has no attribute 'in_'
Nov 03 08:29:49 puppet systemd[1]: matrix-synapse.service: Control process exited, code=exited status=1
Nov 03 08:29:49 puppet systemd[1]: Failed to start Synapse Matrix homeserver.
Nov 03 08:29:49 puppet systemd[1]: matrix-synapse.service: Unit entered failed state.
Nov 03 08:29:49 puppet systemd[1]: matrix-synapse.service: Failed with result 'exit-code'.
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