linux-kernel - Re: usb/net/rt2x00: warning in rt2800_eeprom_word

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Message-ID: <8760bfo09s.fsf@kamboji.qca.qualcomm.com>
Date:   Mon, 16 Oct 2017 13:27:43 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Stanislaw Gruszka <sgruszka@...hat.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Helmut Schaa <helmut.schaa@...glemail.com>,
        linux-wireless@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: usb/net/rt2x00: warning in rt2800_eeprom_word_index

Dmitry Vyukov <dvyukov@...gle.com> writes:

> On Thu, Oct 12, 2017 at 9:25 AM, Stanislaw Gruszka <sgruszka@...hat.com> wrote:
>> Hi
>>
>> On Mon, Oct 09, 2017 at 07:50:53PM +0200, Andrey Konovalov wrote:
>>> I've got the following report while fuzzing the kernel with syzkaller.
>>>
>>> On commit 8a5776a5f49812d29fe4b2d0a2d71675c3facf3f (4.14-rc4).
>>>
>>> I'm not sure whether this is a bug in the driver, or just a way to
>>> report misbehaving device. In the latter case this shouldn't be a
>>> WARN() call, since WARN() means bug in the kernel.
>>
>> This is about wrong EEPROM, which reported 3 tx streams on
>> non 3 antenna device. I think WARN() is justified and thanks
>> to the call trace I was actually able to to understand what
>> happened.
>>
>> In general I do not think WARN() only means a kernel bug, it
>> can be F/W or H/W bug too.
>
> Hi Stanislaw,
>
> Printing messages is fine. Printing stacks is fine. Just please make
> them distinguishable from kernel bugs and don't kill the whole
> possibility of automated Linux kernel testing. That's an important
> capability.

Not really following you. Are you saying that using WARN() prevents
automated Linux kernel testing?

-- 
Kalle Valo