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** Tags added: verification-needed-bionic

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https://bugs.launchpad.net/bugs/1762672

Title:
  TPM intermittently fails after cold-boot

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  On an 18.04 LTS system with a TPM, the TPM will fail intermittently on cold 
boots. The problem seems to be that the TPM gets into a state where the partial 
self-test doesn't return TPM_RC_SUCCESS (meaning all tests have run to 
completion), but instead returns TPM_RC_TESTING (meaning some tests are still 
running in the background). A reboot can sometimes restore TPM functionality.

  This bug was originally reported on a Dell XPS 13, but has also
  recently been reported on a Dell Edge Gateway 3000.

  The bug has been confirmed to be fixed in the current development
  release (19.04/Cosmic).

  [Test Case]
  Cold boot a Dell XPS 13 or Dell Edge Gateway 3000 running 18.04 LTS Desktop 
or Server and grep for the following error log message:

  "tpm tpm0: A TPM error (2314) occurred continue selftest"

  Any attempts at using the TPM via tpm2-tss libraries or tpm2-tools
  should produce errors.

  As this bug is due to a race condition, ideally this test case would
  be run multiple times (20+ cold boots).

  Once the patch is installed the following error message may still be
  present in the syslog, however attempts to use the TPM should work:

  "tpm tpm0: A TPM error (2314) occurred attempting the self test"

  [Regression Potential]
  The chance of regression is low, as this patch was written by a well 
respected kernel developer with deep TPM experience. The patch is also being 
cherry-picked from the upstream stable and LTS kernels, and as mentioned, has 
already landed in Disco.

  [Original Description]
  After updating a Dell XPS 13 to 18.04 LTS, the TPM started to intermittently 
fail on cold boot. The following log messages could be observed in syslog:

  [    0.801334] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 4)
   [    0.812132] tpm tpm0: A TPM error (2314) occurred continue selftest
   [    0.843629] tpm tpm0: A TPM error (2314) occurred continue selftest
   [    0.895424] tpm tpm0: A TPM error (2314) occurred continue selftest
   [    0.987230] tpm tpm0: A TPM error (2314) occurred continue selftest
   [    1.159026] tpm tpm0: A TPM error (2314) occurred continue selftest
   [    1.490819] tpm tpm0: A TPM error (2314) occurred continue selftest
   [    2.142530] tpm tpm0: A TPM error (2314) occurred continue selftest
   [    3.423100] tpm tpm0: TPM self test failed
   [    3.456304] ima: No TPM chip found, activating TPM-bypass! (rc=-19)

  Discussion https://lkml.org/lkml/2017/12/6/284

  Fix
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/char/tpm/tpm2-cmd.c?id=2be8ffed093b91536d52b5cd2c99b52f605c9ba6

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