netdev - Re: [PATCH net 2/4] tcp: tcp_fragment() should apply sane memory limits

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Date:   Fri, 2 Aug 2019 21:58:12 +0200
From:   Bernd <ecki@...ammenkunft.net>
To:     Neal Cardwell <ncardwell@...gle.com>
Cc:     netdev <netdev@...r.kernel.org>, edumazet@...gle.com
Subject: Re: [PATCH net 2/4] tcp: tcp_fragment() should apply sane memory limits

2019-08-02 21:14 GMT+02:00, Neal Cardwell <ncardwell@...gle.com>:
> What's the exact kernel version you are using?

It is the RHEL errata kernel 3.10.0-957.21.3.el7 (rhsa-2019:1481), i
need to check if there is a newer one.

> Eric submitted a patch recently that may address your issue:
>    tcp: be more careful in tcp_fragment()
>
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=b617158dc096709d8600c53b6052144d12b89fab
>
> Would you be able to test your workload with that commit
> cherry-picked, and see if the issue still occurs?

It only happens on a customer system in production up to now, so most
likely not.

> That commit was targeted to many stable releases, so you may be able
> to pick up that fix from a stable branch.

The only thing which is a bit strange, this is a Java client, and I am
pretty sure we don’t set a small SO_SNDBUF, if anything it is
increased (I need to verify that).

Not to worry, I guess I can now with your helpful pointer sort that
out with Redhat.

gruss
Bernd