linux-kernel - Re: [PATCH v1 2/3] Treewide: Stop corrupting socket's task

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Message-ID: <794DBAB0-EDAF-4DA2-A837-C1F99916BC8E@redhat.com>
Date:   Tue, 29 Nov 2022 11:47:47 -0500
From:   Benjamin Coddington <bcodding@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Philipp Reisner <philipp.reisner@...bit.com>,
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Subject: Re: [PATCH v1 2/3] Treewide: Stop corrupting socket's task_frag

On 29 Nov 2022, at 9:02, Christoph Hellwig wrote:

> Hmm.  Having to set a flag to not accidentally corrupt per-task
> state seems a bit fragile.  Wouldn't it make sense to find a way to opt
> into the feature only for sockets created from the syscall layer?

It's totally fragile, and that's why it's currently broken in production.
The fragile ship sailed when networking decided to depend on users setting
the socket's GFP_ flags correctly to avoid corruption.

Meantime, this problem needs fixing in a way that makes everyone happy.
This fix doesn't make it less fragile, but it may (hopefully) address the
previous criticisms enough that something gets done to fix it.

Ben