Hi, You should NEVER ever change 2 core stuff in your architecture in the mean time!!!! First upgrade HAProxy, then later upgrade the kernel.... So if you have an issue, it would be easier to track which component triggered it. In your case, it's quite easy, as everybody mentioned, it is the kernel... So first advice, use your old kernel and install a new one on a pre-prod machine and run your benchmarks... Then you'll be able to help the kernel devs to fix the issue without impacting your production.
cheers
