Passed iozone3 test. I then rebooted w/ the 'break' command line
argument to interrupt boot before mounting the disk, then ran the
following loop:

for i in $(seq 1 10); do modprobe -r hisi_sas_v3_hw; modprobe
hisi_sas_v3_hw; done

It survived, and I was able to boot into the OS from there.

** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

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  hisi_sas robustness fixes

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  Several issues have been uncovered during testing.

  [Test Case]
  Not all of these changes have a reliable reproducer - some are corner cases 
hit during error recovery, etc. However, we can regression test w/ e.g. iozone3 
on the two Ubuntu-supported platforms that use this device, as well as 
remove/reload the module, which is a trigger for some of these issues.

  All fixes here are upstream cherry-picks - see the individual commits for 

  [Regression Risk]
  All fixes are localized to the hisi_sas drivers, which are drivers for the 
controllers in the hip06/hip07 SoCs, where we have directly tested these 

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