linux-kernel - Re: WARNING in __mark_chain

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Date:   Sun, 01 Sep 2019 11:23:00 -0700
From:   syzbot <syzbot+c8d66267fd2b5955287e@...kaller.appspotmail.com>
To:     allison@...utok.net, arvid.brodin@...en.se, ast@...nel.org,
        bpf@...r.kernel.org, clang-built-linux@...glegroups.com,
        daniel@...earbox.net, davem@...emloft.net,
        gregkh@...uxfoundation.org, hawk@...nel.org,
        jakub.kicinski@...ronome.com, jic23@...nel.org,
        john.fastabend@...il.com, kafai@...com, knaack.h@....de,
        kstewart@...uxfoundation.org, lars@...afoo.de,
        linus.walleij@...aro.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, mchehab+samsung@...nel.org,
        netdev@...r.kernel.org, nicolas.ferre@...rochip.com,
        paulmck@...ux.ibm.com, pmeerw@...erw.net, rfontana@...hat.com,
        songliubraving@...com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, torvalds@...ux-foundation.org, yhs@...com
Subject: Re: WARNING in __mark_chain_precision (2)

syzbot has bisected this bug to:

commit e786741ff1b52769b044b7f4407f39cd13ee5d2d
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Thu Jul 11 22:36:02 2019 +0000

     Merge tag 'staging-5.3-rc1' of  
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11958f12600000
start commit:   47ee6e86 selftests/bpf: remove wrong nhoff in flow dissect..
git tree:       bpf-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=13958f12600000
console output: https://syzkaller.appspot.com/x/log.txt?x=15958f12600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d4cf1ffb87d590d7
dashboard link: https://syzkaller.appspot.com/bug?extid=c8d66267fd2b5955287e
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10d26ebc600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=127805ca600000

Reported-by: syzbot+c8d66267fd2b5955287e@...kaller.appspotmail.com
Fixes: e786741ff1b5 ("Merge tag 'staging-5.3-rc1' of  
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection