netdev - Re: [syzbot] WARNING in ieee802154_del

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Message-ID: <20210401133037.GA1052133@rowland.harvard.edu>
Date:   Thu, 1 Apr 2021 09:30:37 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     syzbot <syzbot+fbf4fc11a819824e027b@...kaller.appspotmail.com>
Cc:     a@...table.cc, alex.aring@...il.com,
        b.a.t.m.a.n@...ts.open-mesh.org, davem@...emloft.net,
        info@...hiescuban.com, jkosina@...e.cz, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-wpan@...r.kernel.org,
        mareklindner@...mailbox.ch, netdev@...r.kernel.org,
        stefan@...enfreihafen.org, sw@...onwunderlich.de,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in ieee802154_del_seclevel

On Wed, Mar 31, 2021 at 02:03:08PM -0700, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 416dacb819f59180e4d86a5550052033ebb6d72c
> Author: Alan Stern <stern@...land.harvard.edu>
> Date:   Wed Aug 21 17:27:12 2019 +0000
> 
>     HID: hidraw: Fix invalid read in hidraw_ioctl
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=127430fcd00000
> start commit:   6e5a03bc ethernet/netronome/nfp: Fix a use after free in n..
> git tree:       net
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=117430fcd00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=167430fcd00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=daeff30c2474a60f
> dashboard link: https://syzkaller.appspot.com/bug?extid=fbf4fc11a819824e027b
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13bfe45ed00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1188e31ad00000
> 
> Reported-by: syzbot+fbf4fc11a819824e027b@...kaller.appspotmail.com
> Fixes: 416dacb819f5 ("HID: hidraw: Fix invalid read in hidraw_ioctl")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

It seems likely that the bisection ran off the rails here.  This commit 
could not have caused a problem, although it may have revealed a 
pre-existing problem that previously was hidden.

By the way, what happened to the annotated stack dumps that syzkaller 
used to provide in its bug reports?

Alan Stern