linux-kernel - Re: [syzbot] BUG: corrupted list in netif_napi

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Date:   Thu, 14 Oct 2021 15:50:00 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        syzbot <syzbot+62e474dd92a35e3060d8@...kaller.appspotmail.com>,
        andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        davem@...emloft.net, hawk@...nel.org, john.fastabend@...il.com,
        kafai@...com, kpsingh@...nel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com, yhs@...com
Cc:     toke@...e.dk, joamaki@...il.com
Subject: Re: [syzbot] BUG: corrupted list in netif_napi_add

On Wed, 2021-10-13 at 15:35 +0200, Daniel Borkmann wrote:
> On 10/13/21 1:40 PM, syzbot wrote:
> > Hello,
> > 
> > syzbot found the following issue on:
> 
> [ +Paolo/Toke wrt veth/XDP, +Jussi wrt bond/XDP, please take a look, thanks! ]

For the records: Toke and me are actively investigating this issue and
the other recent related one. So far we could not find anything
relevant. 

The onluy note is that the reproducer is not extremelly reliable - I
could not reproduce locally, and multiple syzbot runs on the same code
give different results. Anyhow, so far the issue was only observerable
on a specific 'next' commit which is currently "not reachable" from any
branch. I'm wondering if the issue was caused by some incosistent
status of such tree.

Cheers,

Paolo