I also noticed that one of the boxes wasn't upgraded (for whatever reason) and has not had any panics in the last few days. The kernel version on that box is: Linux ip-10-0-26-30.us-west-2.compute.internal 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 13:48:03 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
I also noticed that one of the boxes wasn't upgraded (for whatever reason) and has not had any panics in the last few days. The kernel version on that box is: Linux ip-10-0- 26-30.us- west-2. compute. internal 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 13:48:03 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux