On Thu, 2021-02-04 at 20:44 -0500, Stefan Berger wrote: > To clarify: When I tested this I had *both* patches applied. Without > the patches I got the null pointer exception in tpm2_del_space(). The > 2nd patch alone solves that issue when using the steps above. Yes, I can't confirm the bug either. I only have lpc tis devices, so it could be something to do with spi, but when I do python3 in one shell >>> fd = open("/dev/tpmrm0", "wb") do rmmod tpm_tis in another shell >>> buf = bytearray(20) >>> fd.write(buf) 20 so I don't see the oops you see on write. However >>> fd.close() And it oopses here in tpm2_del_space James