I was able to reproduce the problem with the -generic Xenial kernel (on
a c5.large instance):
4.4.0-109.132 works ok
4.4.0-112.135 still broken
Those results correspond as expected to the linux-aws kernel versions.
The problem appears to have been introduced by something in Xenial
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sssd appears to crash AWS c5 and m5 instances, cause 100% CPU
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