This is caused by this commit from mainline:
linux-aws: 9f182bd x86/microcode/intel: Extend BDW late-loading further with
LLC size check
mainline: 7e702d1 x86/microcode/intel: Extend BDW late-loading further with
LLC size check
which adds a check which involves this computation:
+ do_div(llc_size, c->x86_max_cores);
But dmesg on a c3.large instance yields this interesting line:
[ 0.156084] smpboot: x86_max_cores == zero !?!?
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)
** Changed in: linux (Ubuntu)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1758869
Title:
Kernel panic with AWS 4.4.0-1053 / 4.4.0-1015 (Trusty)
Status in linux package in Ubuntu:
In Progress
Bug description:
This is a POTENTIAL REGRESSION.
This issue only occurs on one of the AWS testing instance "c3.large"
Reproduce rate: 100% (All jenkins deployment job failed with this
instance)
Steps:
1. Deploy this instance with AWS kernel (4.4.0-1052)
2. Enable -proposed, upgrade it and reboot.
Result:
* System can boot with 4.4.0-1052, but it won't be accessible after
rebooting for 4.4.0-1053, from "aws ec2 get-console-output" command indicates
it hang with kernel panic issue on boot. It looks like the intel-microcode is
causing this issue.
Output from the command: https://pastebin.ubuntu.com/p/3JvWNk5CTs/
(it's a bit difficult to get full output, the instance will keep
rebooting itself)
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