netdev - Re: WARNING in kernfs_create_dir

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Date:   Sun, 30 Jun 2019 03:40:00 -0700
From:   syzbot <syzbot+38f5d5cf7ae88c46b11a@...kaller.appspotmail.com>
To:     a@...table.cc, b.a.t.m.a.n@...ts.open-mesh.org,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        hongjiefang@...micro.com, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, mareklindner@...mailbox.ch,
        netdev@...r.kernel.org, sw@...onwunderlich.de,
        syzkaller-bugs@...glegroups.com, tj@...nel.org,
        ulf.hansson@...aro.org
Subject: Re: WARNING in kernfs_create_dir_ns

syzbot has bisected this bug to:

commit 7f38abf220e2c800a2c451372e9f07ed5fd0ea49
Author: Hongjie Fang <hongjiefang@...micro.com>
Date:   Tue Jul 31 02:55:09 2018 +0000

     mmc: core: improve reasonableness of bus width setting for HS400es

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=129d6755a00000
start commit:   72825454 Merge branch 'x86-urgent-for-linus' of git://git...
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=119d6755a00000
console output: https://syzkaller.appspot.com/x/log.txt?x=169d6755a00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9a31528e58cc12e2
dashboard link: https://syzkaller.appspot.com/bug?extid=38f5d5cf7ae88c46b11a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12a6c439a00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1353c323a00000

Reported-by: syzbot+38f5d5cf7ae88c46b11a@...kaller.appspotmail.com
Fixes: 7f38abf220e2 ("mmc: core: improve reasonableness of bus width  
setting for HS400es")

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