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.

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https://bugs.launchpad.net/bugs/1835279

Title:
  4.15.0-54.58-generic 4.15.18: oops/BUG on LUKS open

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