Re: TPM selftest failure in 4.15

Jarkko Sakkinen
2018-02-08T12:49:44Z

On Thu, Feb 01, 2018 at 12:16:11PM +0000, James Bottomley wrote:
> Embarrassingly enough, I'm just on my way to do a TPM talk at FOSDEM.
> I installed my shiny new 4.15 kernel on the 'plane and this is what I
> got after I arrived this morning:
>
> jejb@jarvis:~> dmesg | grep -i tpm
> [ 0.000000] ACPI: TPM2 0x0000000079446CC0 000034
> (v03 Tpm2Tabl 00000001 AMI 00000000)
> [ 1.598059] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 2)
> [ 1.608863] tpm tpm0: A TPM error (2314) occurred continue selftest
> [ 1.640052] tpm tpm0: A TPM error (2314) occurred continue selftest
> [ 1.691215] tpm tpm0: A TPM error (2314) occurred continue selftest
> [ 1.782377] tpm tpm0: A TPM error (2314) occurred continue selftest
> [ 1.953539] tpm tpm0: A TPM error (2314) occurred continue selftest
> [ 2.284701] tpm tpm0: A TPM error (2314) occurred continue selftest
> [ 2.935743] tpm tpm0: A TPM error (2314) occurred continue selftest
> [ 4.216236] tpm tpm0: TPM self test failed
> [ 4.236829] ima: No TPM chip found, activating TPM-bypass! (rc=-19)
>
> The error is TPM_RC_TESTING, which means it looks like we don't wait
> long enough for the selftests to complete. I get this all the time
> booting with 4.15. Fortunately I have a 4.13 backup kernel which is
> fine (otherwise I'd be a bit hosed since all my keys now require a
> TPM).
>
> I'll debug on the train; my current suspicion is that the TPM_LONG
> duration might be a bit short for this chip (A nuvoton 6xx in a dell
> XPS-13).
>
> James

I also have XPS 13. I'll check if I can reproduce this. Sorry for the
latency. At busy times I have some latency for messages that do not
include me in to/cc fields but I eventually catch these. If you want
a quicker response, do that in the future.

/Jarkko