netdev - Re: WARNING in kobject_add

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Message-ID: <CACT4Y+bc0hsCdmakcOFpztkocimLgTtWwzGsgCrtf9RnSgkp5A@mail.gmail.com>
Date:   Thu, 12 Apr 2018 12:04:18 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     "Yuan, Linyu (NSB - CN/Shanghai)" <linyu.yuan@...ia-sbell.com>
Cc:     "bridge@...ts.linux-foundation.org" 
        <bridge@...ts.linux-foundation.org>,
        David Miller <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        stephen hemminger <stephen@...workplumber.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING in kobject_add_internal

On Thu, Apr 12, 2018 at 2:29 AM, Yuan, Linyu (NSB - CN/Shanghai)
<linyu.yuan@...ia-sbell.com> wrote:
> Hi,
>
> I have a question,
> "can syzbot auto test each tree with newest changeset" ?

Hi Yuan,

Please elaborate.
What trees? What newest changeset? Test against what criteria?

>> -----Original Message-----
>> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
>> On Behalf Of Dmitry Vyukov
>> Sent: Wednesday, April 11, 2018 10:58 PM
>> To: syzbot
>> Cc: bridge@...ts.linux-foundation.org; David Miller; Greg Kroah-Hartman;
>> LKML; netdev; stephen hemminger; syzkaller-bugs
>> Subject: Re: WARNING in kobject_add_internal
>>
>> On Fri, Jan 5, 2018 at 10:41 PM, syzbot
>> <syzbot+e204ced820ef739d71ef5438f5e1976a874abc8d@...kaller.appspotma
>> il.com>
>> wrote:
>> > syzkaller has found reproducer for the following crash on
>> > 89876f275e8d562912d9c238cd888b52065cf25c
>> > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>> > compiler: gcc (GCC) 7.1.1 20170620
>> > .config is attached
>> > Raw console output is attached.
>> > C reproducer is attached
>> > syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>> > for information about syzkaller reproducers
>> >
>> >
>> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> > Reported-by:
>> >
>> syzbot+e204ced820ef739d71ef5438f5e1976a874abc8d@...kaller.appspotmail
>> .com
>> > It will help syzbot understand when the bug is fixed.
>>
>> #syz dup: WARNING: kobject bug in device_add
>>
>> > ------------[ cut here ]------------
>> > kobject_add_internal failed for   (error: -12 parent: net)
>> > WARNING: CPU: 1 PID: 3494 at lib/kobject.c:244
>> > kobject_add_internal+0x3f6/0xbc0 lib/kobject.c:242
>> > Kernel panic - not syncing: panic_on_warn set ...
>> >
>> > CPU: 1 PID: 3494 Comm: syzkaller425998 Not tainted 4.15.0-rc6+ #249
>> > Hardware name: Google Google Compute Engine/Google Compute Engine,
>> BIOS
>> > Google 01/01/2011
>> > Call Trace:
>> >  __dump_stack lib/dump_stack.c:17 [inline]
>> >  dump_stack+0x194/0x257 lib/dump_stack.c:53
>> >  panic+0x1e4/0x41c kernel/panic.c:183
>> >  __warn+0x1dc/0x200 kernel/panic.c:547
>> >  report_bug+0x211/0x2d0 lib/bug.c:184
>> >  fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
>> >  fixup_bug arch/x86/kernel/traps.c:247 [inline]
>> >  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
>> >  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
>> >  invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1079
>> > RIP: 0010:kobject_add_internal+0x3f6/0xbc0 lib/kobject.c:242
>> > RSP: 0018:ffff8801c53c76f0 EFLAGS: 00010286
>> > RAX: dffffc0000000008 RBX: ffff8801bf5a88d8 RCX: ffffffff8159da9e
>> > RDX: 0000000000000000 RSI: 1ffff10038a78e99 RDI: ffff8801c53c73f8
>> > RBP: ffff8801c53c77e8 R08: 1ffff10038a78e5b R09: 0000000000000000
>> > R10: ffff8801c53c74b0 R11: 0000000000000000 R12: 1ffff10038a78ee4
>> > R13: 00000000fffffff4 R14: ffff8801d8359a80 R15: ffffffff86201980
>> >  kobject_add_varg lib/kobject.c:366 [inline]
>> >  kobject_add+0x132/0x1f0 lib/kobject.c:411
>> >  device_add+0x35d/0x1650 drivers/base/core.c:1787
>> >  netdev_register_kobject+0x183/0x360 net/core/net-sysfs.c:1604
>> >  register_netdevice+0xb2b/0x1010 net/core/dev.c:7698
>> >  tun_set_iff drivers/net/tun.c:2319 [inline]
>> >  __tun_chr_ioctl+0x1d89/0x3dd0 drivers/net/tun.c:2524
>> >  tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2773
>> >  vfs_ioctl fs/ioctl.c:46 [inline]
>> >  do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
>> >  SYSC_ioctl fs/ioctl.c:701 [inline]
>> >  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
>> >  entry_SYSCALL_64_fastpath+0x23/0x9a
>> > RIP: 0033:0x444fc9
>> > RSP: 002b:00007fff53389dc8 EFLAGS: 00000246 ORIG_RAX:
>> 0000000000000010
>> > RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000444fc9
>> > RDX: 0000000020533000 RSI: 00000000400454ca RDI: 0000000000000004
>> > RBP: 0000000000000005 R08: 0000000000000002 R09: 0000006f00003131
>> > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402500
>> > R13: 0000000000402590 R14: 0000000000000000 R15: 0000000000000000
>> >
>> > Dumping ftrace buffer:
>> >    (ftrace buffer empty)
>> > Kernel Offset: disabled
>> > Rebooting in 86400 seconds..
>> >