I'm experiencing this issue too with artful on c5.large. During the
installation of sssd-common 1.15.3-2ubuntu1, the last line of output is
"Warning failed to create cache: usr.sbin.sssd" before the instance
becomes unresponsive. If I use t2.medium, I don't experience this issue.
Regions tested: us-west-2 and eu-west-1
I do believe that I've experienced this issue without installing sssd,
sometimes the machine fails to boot from the initial launch of the AMI.
It freezes at "kernel: iscsi: registered transport (iser)"
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sssd appears to crash AWS c5 and m5 instances, cause 100% CPU
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