With the latest update to the linux-raspberrypi kernel page, I have a rpi 2 and 3 that won't boot. This can be pinned to the 4.9.11 release, as rolling back to the latest image boot partition will yield a successful boot. This is a rather serious bug, as it makes rpi devices fail to complete boot up after they are updated to the latest kernel.
Panic message:
$this->bbcode_second_pass_code('', 'PANIC: stack-protector: Kernel stack is corrupted in: 7f13b2a0')
Drops to kdb after this.
Original forum post with others having this problem is here:
https://archlinuxarm.org/forum/viewtopic.php?f=60&t=11349
Happy to help troubleshoot and provide more information if needed.