Comment 10 for bug 1862312

Hi Marcelo,
as it's much more easier to reproduce this on clouds (for now), so I just built a bionic AWS kernel with that commit reverted:
https://people.canonical.com/~phlin/kernel/lp-1862312-memhp/

The memory hotplug test works fine with multiple retries with this kernel. But if I switched to the 1059 in proposed, the r5.large instance will crash within 2 retries.