netdev - Re: UDP sendto() fails with EINVAL when host under network load

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Message-ID: <20181227154807.40e0ac2f@shemminger-XPS-13-9360>
Date:   Thu, 27 Dec 2018 15:48:07 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     charles cross <xcross59@...oud.com>
Cc:     netdev@...r.kernel.org
Subject: Re: UDP sendto() fails with EINVAL when host under network load

On Thu, 27 Dec 2018 16:13:29 -0500
charles cross <xcross59@...oud.com> wrote:

> The kernel is v3.10.0 from upstream RHEL 7.5. Can anyone offer advice before I proceed down the stack to look for the root cause? The behavior (failure under load but recovery after the load is removed) suggests contention for resources but the EINVAL return code makes no sense to me given the arguments to sendto() do not change. I am totally unfamiliar with this code so any help is appreciated.

RHEL is on a 5 1/2 year old kernel. So I doubt the upstream kernel developers are going to be much help here.
Can you reproduce it with 4.20?