The ifquery segfaults should be safe to ignore. I see those a lot but those 
don't seem to have any impact (yeah, probably should be fixed at some point ... 
if there were not always more pressing matters). Your in-house utility, hard to 
say without knowing more about what causes the segfault there. If the kernel 
interfaces were all well written it should not be possible but of course they 
are not.
If you really get crashes (in the sense guest goes away completely like before) 
with 4.0, could you post me a console stacktrace. That should be different to 
some degree as the timer code changes were not done before 4.2.
Kexec crashdump only works on HVM guests if you were not using PV drivers for 
network and disk. Which could make the problem go away (as well as any good 
performance). To make it work with PV drivers needs a very recent kernel (I 
think 4.4) as well as some support on the host side (which there is no control 
over on AWS).

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https://bugs.launchpad.net/bugs/1534345

Title:
  Ubuntu 15.10 Crashing Frequently on EC2 Instances w/ Enhanced
  Networking

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