netdev - Re: WARNING in is_bpf_text

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Message-ID: <20190815075142.vuza32plqtiuhixx@willie-the-truck>
Date:   Thu, 15 Aug 2019 08:51:42 +0100
From:   Will Deacon <will@...nel.org>
To:     syzbot <syzbot+bd3bba6ff3fcea7a6ec6@...kaller.appspotmail.com>,
        bvanassche@....org
Cc:     akpm@...ux-foundation.org, ast@...nel.org, bpf@...r.kernel.org,
        bvanassche@....org, daniel@...earbox.net, davem@...emloft.net,
        dvyukov@...gle.com, hawk@...nel.org, hdanton@...a.com,
        jakub.kicinski@...ronome.com, johannes.berg@...el.com,
        johannes@...solutions.net, john.fastabend@...il.com, kafai@...com,
        linux-kernel@...r.kernel.org, longman@...hat.com, mingo@...nel.org,
        netdev@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
        peterz@...radead.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, tj@...nel.org,
        torvalds@...ux-foundation.org, will.deacon@....com,
        xdp-newbies@...r.kernel.org, yhs@...com
Subject: Re: WARNING in is_bpf_text_address

Hi Bart,

On Sat, Aug 10, 2019 at 05:24:06PM -0700, syzbot wrote:
> syzbot has found a reproducer for the following crash on:
> 
> HEAD commit:    451577f3 Merge tag 'kbuild-fixes-v5.3-3' of git://git.kern..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=120850a6600000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=2031e7d221391b8a
> dashboard link: https://syzkaller.appspot.com/bug?extid=bd3bba6ff3fcea7a6ec6
> compiler:       clang version 9.0.0 (/home/glider/llvm/clang
> 80fee25776c2fb61e74c1ecb1a523375c2500b69)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=130ffe4a600000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17137d2c600000
> 
> The bug was bisected to:
> 
> commit a0b0fd53e1e67639b303b15939b9c653dbe7a8c4
> Author: Bart Van Assche <bvanassche@....org>
> Date:   Thu Feb 14 23:00:46 2019 +0000
> 
>     locking/lockdep: Free lock classes that are no longer in use
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=152f6a9da00000
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=172f6a9da00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=132f6a9da00000

I know you don't think much to these reports, but please could you have a
look (even if it's just to declare it a false positive)?

Cheers,

Will