The problem is more serious than I thought:
kthread_create() in crypto/cryptd.c line 302 doesn't return, so cryptd is stuck
in TASK_UNINTERRUPTIBLE all the time and it doesn't even execute one
instruction from cryptd_thread() [this happens on x86_64].
I've investigated this for a while, but I don't know why it happens.
Greetings,
Rafael
-