netdev - Re: WARNING in print_bfs

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Date:   Thu, 31 Oct 2019 18:02:01 -0700
From:   syzbot <syzbot+62ebe501c1ce9a91f68c@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, dsahern@...il.com,
        f.fainelli@...il.com, hannes@...xchg.org, hawk@...nel.org,
        hughd@...gle.com, idosch@...lanox.com,
        jakub.kicinski@...ronome.com, jglisse@...hat.com,
        jiri@...lanox.com, johannes.berg@...el.com,
        john.fastabend@...il.com, kafai@...com,
        kirill.shutemov@...ux.intel.com, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, mkubecek@...e.cz,
        netdev@...r.kernel.org, petrm@...lanox.com,
        roopa@...ulusnetworks.com, sfr@...b.auug.org.au,
        songliubraving@...com, syzkaller-bugs@...glegroups.com,
        william.kucharski@...cle.com, willy@...radead.org, yhs@...com,
        yoshfuji@...ux-ipv6.org
Subject: Re: WARNING in print_bfs_bug

syzbot has bisected this bug to:

commit 9c61acffe2b8833152041f7b6a02d1d0a17fd378
Author: Song Liu <songliubraving@...com>
Date:   Wed Oct 23 00:24:28 2019 +0000

     mm,thp: recheck each page before collapsing file THP

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15be4e14e00000
start commit:   49afce6d Add linux-next specific files for 20191031
git tree:       linux-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=17be4e14e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=13be4e14e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3c5f119b33031056
dashboard link: https://syzkaller.appspot.com/bug?extid=62ebe501c1ce9a91f68c
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14c162f4e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=131b5eb8e00000

Reported-by: syzbot+62ebe501c1ce9a91f68c@...kaller.appspotmail.com
Fixes: 9c61acffe2b8 ("mm,thp: recheck each page before collapsing file THP")

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