netdev - Re: bug report: WARNING in bonding

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Message-ID: <67b689d8-419b-78ec-0286-0983337ca3c1@gmail.com>
Date:   Thu, 18 Feb 2021 19:10:35 +0200
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Ido Schimmel <idosch@...sch.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Moshe Shemesh <moshe@...dia.com>,
        Itay Aveksis <itayav@...dia.com>,
        Ran Rozenstein <ranro@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>
Subject: Re: bug report: WARNING in bonding



On 11/12/2020 6:33 PM, Ido Schimmel wrote:
> On Thu, Nov 12, 2020 at 05:54:30PM +0200, Tariq Toukan wrote:
>>
>>
>> On 11/12/2020 5:46 PM, Ido Schimmel wrote:
>>> On Thu, Nov 12, 2020 at 05:38:44PM +0200, Tariq Toukan wrote:
>>>> Hi all,
>>>>
>>>> In the past ~2-3 weeks, we started seeing the following WARNING and traces
>>>> in our regression testing systems, almost every day.
>>>>
>>>> Reproduction is not stable, and not isolated to a specific test, so it's
>>>> hard to bisect.
>>>>
>>>> Any idea what could this be?
>>>> Or what is the suspected offending patch?
>>>
>>> Do you have commit f8e48a3dca06 ("lockdep: Fix preemption WARN for spurious
>>> IRQ-enable")? I think it fixed the issue for me
>>>
>>
>> We do have it. Yet issue still exists.
> 
> I checked my mail and apparently we stopped seeing this warning after I
> fixed a lockdep issue (spin_lock() vs spin_lock_bh()) in a yet to be
> submitted patch. Do you see any other lockdep warnings in the log
> besides this one? Maybe something in mlx4/5 which is why syzbot didn't
> hit it?
> 

Hi,

Issue still reproduces. Even in GA kernel.
It is always preceded by some other lockdep warning.

So to get the reproduction:
- First, have any lockdep issue.
- Then, open bond interface.

Any idea what could it be?

We'll share any new info as soon as we have it.

Regards,
Tariq