This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verification-needed-bionic' to 'verification-failed-

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

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** Tags added: verification-needed-bionic

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  arm-smmu-v3 CMD_SYNC timeout

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

Bug description:
  During heavy load, the following message may appear on the console of a 
HiSilicon D06 system:

  arm-smmu-v3 CMD_SYNC timeout

  This is due to a bug that can also impact system performance, as the
  CPU is blocked until the timeout occurs.

  [Test Case]
  The Ubuntu server certification test suite hits this pretty reliably during 
the stress-ng tests, although I haven't narrowed it down to exactly which test 

  0f02477d16980 iommu/arm-smmu-v3: Fix unexpected CMD_SYNC timeout

  [Regression Risk]
  Limited to arm64 systems. This change has been upstream since 4.20 w/o any 
noticed regressions (based on lack of Fixes: commits). Regressions could 
manifest as a performance hit.

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