linux-kernel - Re: Kernel panic in netif_rx_internal after v6 pings between netns

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Message-ID: <5340b60d-a09a-4865-a648-d1a45e9e6d5f@kernel.org>
Date: Sat, 20 Jan 2024 18:53:50 +0100
From: Matthieu Baerts <matttbe@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Netdev <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Kernel panic in netif_rx_internal after v6 pings between netns

Hi Eric,

On 16/01/2024 22:15, Matthieu Baerts wrote:
> Hi Eric,
> 
> Thank you for your quick reply!
> 
> 16 Jan 2024 20:17:40 Eric Dumazet <edumazet@...gle.com>:
>> On Tue, Jan 16, 2024 at 7:36 PM Matthieu Baerts <matttbe@...nel.org> wrote:
>>> Our MPTCP CIs recently hit some kernel panics when validating the -net
>>> tree + 2 pending MPTCP patches. This is on top of e327b2372bc0 ("net:
>>> ravb: Fix dma_addr_t truncation in error case").
>>>
>>> It looks like these panics are not related to MPTCP. That's why I'm
>>> sharing that here:
>>
>> Indeed, this seems an x86 issue to me (jump labels ?)
> 
> Thank you, good point!
> 
> (I don't know why I always think there is no x86 issue :) )
> 
>> are all stack
>> traces pointing to the same issue ?
> 
> I think so.

FYI, I managed to find a commit that seems to be causing the issue:

  8e791f7eba4c ("x86/kprobes: Drop removed INT3 handling code")

It is not clear why, but if I revert it, I can no longer reproduce the
issue. I reported the issue to the patch's author and the x86's ML:

https://lore.kernel.org/r/06cb540e-34ff-4dcd-b936-19d4d14378c9@kernel.org

Thank you again for your help.

Cheers,
Matt
-- 
Sponsored by the NGI0 Core fund.