CELERY_EVENT_SERIALIZER = 'pickle' rejected by kombu

gistfile1.sh

#!/bin/bash

IFS=; shopt -s nullglob

export PIP_REQUIRE_VIRTUALENV=
export PYTHONUNBUFFERED=x
export PYTHON=$(type -p python2.7 python2.6 python2 python | head -n1)
export PIP=$(type -p pip-2.7 pip-2.6 pip2 pip | head -n1)

cat <<'EOF' > controller.py
# encoding: utf-8

from __future__ import absolute_import

import os
import sys
import uwsgi
import celery

sys.dont_write_bytecode = True
_name_orig, __name__ = __name__, 'controller'
sys.modules[__name__] = sys.modules[_name_orig]
ident = '%s@' % os.getpid()


@celery.shared_task
def marco(*args):
    return 'polo'


def worker(core=None):
    app = celery.Celery()
    app.conf.CELERY_ACCEPT_CONTENT = ['pickle', 'json']
    app.conf.CELERY_EVENT_SERIALIZER = 'pickle'
    # ^^^^^^^^^^ THIS OPT IS THE PROBLEM! REMOVE TO FIX!
    worker = app.Worker(hostname=ident, pool_cls='solo')
    return worker.start()
EOF

git clone --depth 1 https://github.com/unbit/uwsgi dists/uwsgi 2> /dev/null
cd dists/uwsgi &&
    sed -r -i 's/= python/= dumbloop,python/' buildconf/default.ini && (
        [[ -x ./uwsgi ]] || (
            ${PYTHON} uwsgiconfig.py --clean &&
            ${PYTHON} uwsgiconfig.py --build
            )
        ) && (
        ${PIP} install --target=../ celery==3.1.6 ||
            ${PIP} install --user celery==3.1.6 ||
            sudo ${PIP} install celery==3.1.6
        ) && (
        cd ../..
        dists/uwsgi/uwsgi \
            --master \
            --loop=dumb \
            --processes=2 \
            --enable-threads \
            --pythonpath=dists \
            --dumbloop-code=controller.py \
            --dumbloop-function=worker \
            --worker-reload-mercy=2 \
            &
        sleep 4
        kill -INT %%
        wait
        )