Hi, I had a short look at your logs and yes, this definitely looks like a driver issue and not related to the tpm2 software stack or the tpm itself. However, during the development of the drivers and my daily work I did not see this happening on my rpi platforms. I would suggest taking this discussion to the tpm driver mailing list which is located at linux-integrity(a)vger.kernel.org it usually makes sense to subscribe to the mailing list first, before posting the first message to avoid moderation of the message. See http://vger.kernel.org/vger-lists.html#linux-integrity For the Linux Kernel related mailing lists it is important to post *plaintext* emails *without* attachments. Just paste the contents of your logs below your email, especially the dmesg output. The (first) question is of course if you can reproduce it using the latest stable 4.19.167 and the lastest master/mainline 5.11-rc3 Thanks, Peter