Just from my memory: I believe that config option (at least on the x86) side 
required support in the compiler which is not available back in the Trusty 
user-space. And the Trusty/lts-backport-xenial (not called HWE, yet to really 
make things confusing) is build in the Trusty user-space environment. The 
config options for stack protector (there was something available with a 
different option name) get automatically converted using the backport script.
If its left set for arm64, its probably a mistake, but somehow seems to have no 
visible effect. Maybe its ignored on that arch or the arm64 gcc was already 
including that option.
If that option is really actively enabled on arm64, then the test should 
probably be changed to expect this. If its a false positive, the test also 
needs to be adapted, but ... differently.

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https://bugs.launchpad.net/bugs/1789353

Title:
  stack protector related configs test failed in qrt for ARM64  T-HWE

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