netdev - Re: WARNING: CPU: 1

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Date:   Tue, 5 Jan 2021 11:18:01 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Arend Van Spriel <arend.vanspriel@...adcom.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 Mon, Sep 28, 2020 at 12:04 PM Dmitry Vyukov <dvyukov@...gle.com> 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.

#syz dup: WARNING in sta_info_insert_rcu