KASAN + CPU soft-hotplug = stack-out-of-bounds at cpuinfo_store_cpu

[Qian Cai]

On Fri, Nov 12, 2021 at 11:50:19PM -0500, Qian Cai wrote:
> FYI, running CPU soft-hotplug with KASAN on arm64 defconfig will
> always trigger a stack-out-of-bounds below.

Actually, KASAN is not enough to trigger. It needs some addition
debugging options to reproduce. I'll narrow it down later. Anyway,
this one will reproduce.

http://lsbug.org/tmp/config-bad-14rc1.txt