linux-kernel - Re: kernel BUG in __pskb_pull

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Message-ID: <6837b784-9105-e2f2-252c-f5f7f451f128@gmail.com>
Date:   Thu, 23 Sep 2021 06:58:38 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Hao Sun <sunhao.th@...il.com>, davem@...emloft.net,
        kuba@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
        kafai@...com, kpsingh@...nel.org, netdev@...r.kernel.org,
        songliubraving@...com, yhs@...com
Subject: Re: kernel BUG in __pskb_pull_tail



On 9/23/21 3:51 AM, Hao Sun wrote:
> Hello,
> 
> When using Healer to fuzz the latest Linux kernel, the following crash
> was triggered.
> 
> HEAD commit: 92477dd1faa6 Merge tag 's390-5.15-ebpf-jit-fixes'
> git tree: upstream
> console output:
> https://drive.google.com/file/d/1f2RLLaRmVwV9ffKgoHvMuXGSs-730rdm/view?usp=sharing
> kernel config: https://drive.google.com/file/d/1KgvcM8i_3hQiOL3fUh3JFpYNQM4itvV4/view?usp=sharing
> 
> Sorry, I don't have a reproducer for this crash, hope the symbolized
> report can help.
> If you fix this issue, please add the following tag to the commit:
> Reported-by: Hao Sun <sunhao.th@...il.com>
> 
>

This has been reported many times and we (Vasily, Jakub, ...) are on it.
A bit slow to review V8 because of LPC conference.