linux-kernel - Re: [RFC][PATCHSET] iov

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Message-ID: <1337e3ea-6984-7f70-98cc-f20a43e659d2@quicinc.com>
Date:   Thu, 10 Jun 2021 15:08:19 -0400
From:   Qian Cai <quic_qiancai@...cinc.com>
To:     Al Viro <viro@...iv.linux.org.uk>
CC:     Linus Torvalds <torvalds@...ux-foundation.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        David Sterba <dsterba@...e.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Anton Altaparmakov <anton@...era.com>,
        David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: Re: [RFC][PATCHSET] iov_iter work



On 6/10/2021 11:35 AM, Al Viro wrote:
> On Thu, Jun 10, 2021 at 10:29:59AM -0400, Qian Cai wrote:
> 
>> Al, a quick fuzzing on today's linux-next triggered this. I never saw this before, so I am wondering if this is anything to do with this series. I could try to narrow it down and bisect if necessary. Any thoughts?
> 
> Do you have a reproducer?

I have no idea how reproducible this is, but it was triggered by running the fuzzing within a half-hour.

$ trinity -C 16

> call of memcpy_from_skb(), calling copy_from_iter_full(), which
> calls iov_iter_revert() on failure now...
> 
> Bloody hell.  Incremental, to be folded in:

This patch is running good so far. I'll report back if things changed.