@dalibor983 To write session before sending request, I overrode AppKernel#handle like below:

    public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true)
    {
        $response = parent::handle($request, $type, $catch);

        if ($type == HttpKernelInterface::MASTER_REQUEST) {
            if ($this->getContainer()->get('session')->isStarted()) {
                $this->getContainer()->get('session')->save();
            }
        }

        return $response;
    }

I use memcache (without trailing "d") for session handler and faced similar problem.
after this change, it's working almost fine, works when requests are serial.

But when requests are done parallel (i.e. using ajax), it doesn't work because PdoSessionHandler
does not have lock mechanism like one that php-native file session has.

Probably php-native file session uses flock(LOCK_EX). So next request waits until lock is released.

To do like that, you have to introduce row level locking (begin transaction when open and SELECT FOR UPDATE when read)

Uh oh!

Symfony 2.2.1 - session lost after success login rediraction #7885

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