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Hey Claudio,
Did you experience this only after upgrading from a previous kernel? If so, what was the kernel that you upgraded from?
I've been trying to reproduce this issue locally in a VM but haven't had any luck so far. So, I've been working from the kernel Oops in comment #1 and I am pretty sure I see where the NULL pointer is coming from but I am not sure yet where it's being to NULL. Since this smells a little bit like a race condition (unconfirmed) I'm trying to find ways to narrow down the search radius.
I have a couple of options in mind for moving forward:
1. We can have you try out a few mainline kernels. If you experience the bug in one of the kernels but not another, we can "bisect" between mainline kernels to zero in on the culpable patch. I would be very interested to see if you experience the same regression on the latest mainline kernel, as that may indicate that the regression also exists in mainline.
2. I can continue reading through the code and prepare a debug kernel that will hopefully give us more information when the bug is triggered. My goal behind this would be to narrow down precisely where/how that NULL pointer is being set.
Let me know if either of those options sound feasible to you.