netdev - Re: WARNING: CPU: 1

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Date:   Mon, 28 Sep 2020 12:46:08 +0200
From:   Arend Van Spriel <arend.vanspriel@...adcom.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+3640e696903873858f7e@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-wireless <linux-wireless@...r.kernel.org>
Subject: Re: WARNING: CPU: 1

On 9/28/2020 12:04 PM, Dmitry Vyukov wrote:
> On Mon, Sep 28, 2020 at 11:31 AM Arend Van Spriel
> <arend.vanspriel@...adcom.com> wrote:
>>
>> On 9/27/2020 10:47 AM, Dmitry Vyukov wrote:
>>> On Sun, Sep 27, 2020 at 10:38 AM syzbot
>>> <syzbot+3640e696903873858f7e@...kaller.appspotmail.com> wrote:
>>>>
>>>> Hello,
>>>>
>>>> syzbot found the following issue on:
>>>>
>>>> HEAD commit:    748d1c8a Merge branch 'devlink-Use-nla_policy-to-validate-..
>>>> git tree:       net-next
>>>> console output: https://syzkaller.appspot.com/x/log.txt?x=13ac3ec3900000
>>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=51fb40e67d1e3dec
>>>> dashboard link: https://syzkaller.appspot.com/bug?extid=3640e696903873858f7e
>>>> compiler:       gcc (GCC) 10.1.0-syz 20200507
>>>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1599be03900000
>>>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=149fd44b900000
>>>
>>> Based on the reproducer, this looks like some wireless bug.
>>> +net/wireless maintainers.
>>
>> I don't think so looking at this part of the stacktrace:
>>
>> [   51.814941]  [<ffffffff8465cc95>] macvlan_common_newlink+0xa15/0x1720
>> [   51.833542]  [<ffffffff84662548>] macvtap_newlink+0x128/0x230
>> [   51.858008]  [<ffffffff85b68bfe>] rtnl_newlink+0xe5e/0x1780
>> [   51.925885]  [<ffffffff85b5d32b>] rtnetlink_rcv_msg+0x22b/0xc20
>>
>> Regards,
>> Arend
> 
> That's the trace on the oldest release and the bisection was diverged
> somewhere midway.
> You may see this in the bisection log:
> https://syzkaller.appspot.com/text?tag=Log&x=1474aaad900000
> 
> Initially it crashed with this warning:
> all runs: crashed: WARNING in sta_info_insert_rcu
> 
> This function is in net/mac80211/sta_info.c.

I see. Thanks for the clarification. It was not really obvious where to 
dig for information.

Regards,
Arend

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