Re: kernel BUG at net/core/dev.c:LINE! (3)

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    4ff91fa0 Merge branch 'udp_tunnel-NIC-RX-port-offload-infr..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1777b9bf100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8a8f9de6c9d911de
dashboard link: https://syzkaller.appspot.com/bug?extid=af23e7f3e0a7e10c8b67
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13a7c4f7100000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+af23e7f3e0a7e10c8b67@xxxxxxxxxxxxxxxxxxxxxxxxx

bond1 (unregistering): (slave wireguard2): Releasing backup interface
bond1 (unregistering): (slave wireguard1): Releasing backup interface
bond1 (unregistering): (slave wireguard0): Releasing backup interface
device wireguard0 left promiscuous mode
bond1 (unregistering): Destroying bond
------------[ cut here ]------------
kernel BUG at net/core/dev.c:8948!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 129 Comm: kworker/u4:3 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:rollback_registered_many+0x2be/0xf60 net/core/dev.c:8948
Code: 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 0f 85 91 0c 00 00 48 b8 22 01 00 00 00 00 ad de 48 89 43 70 e9 b9 fe ff ff e8 82 19 3d fb <0f> 0b 4c 8d 7b 68 4c 8d 6b 70 eb a5 e8 71 19 3d fb 48 8b 74 24 10
RSP: 0018:ffffc90000e976b0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880a2bb0000 RCX: ffffffff86369018
RDX: ffff8880a8dcc2c0 RSI: ffffffff8636916e RDI: 0000000000000001
RBP: ffffc90000e97770 R08: 0000000000000000 R09: ffffffff8a7b9707
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a2bb0068 R14: ffffc90000e97718 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000e07978 CR3: 0000000093d17000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rollback_registered net/core/dev.c:9022 [inline]
 unregister_netdevice_queue+0x2dd/0x570 net/core/dev.c:10103
 unregister_netdevice include/linux/netdevice.h:2762 [inline]
 bond_release_and_destroy drivers/net/bonding/bond_main.c:2212 [inline]
 bond_slave_netdev_event drivers/net/bonding/bond_main.c:3285 [inline]
 bond_netdev_event.cold+0xc1/0x10e drivers/net/bonding/bond_main.c:3398
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2033
 call_netdevice_notifiers_extack net/core/dev.c:2045 [inline]
 call_netdevice_notifiers net/core/dev.c:2059 [inline]
 rollback_registered_many+0x665/0xf60 net/core/dev.c:8977
 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10122
 unregister_netdevice_many net/core/dev.c:10121 [inline]
 default_device_exit_batch+0x30c/0x3d0 net/core/dev.c:10605
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:189
 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Modules linked in:
---[ end trace c01e039c1ee3796a ]---
RIP: 0010:rollback_registered_many+0x2be/0xf60 net/core/dev.c:8948
Code: 4c 89 e8 48 c1 e8 03 42 80 3c 20 00 0f 85 91 0c 00 00 48 b8 22 01 00 00 00 00 ad de 48 89 43 70 e9 b9 fe ff ff e8 82 19 3d fb <0f> 0b 4c 8d 7b 68 4c 8d 6b 70 eb a5 e8 71 19 3d fb 48 8b 74 24 10
RSP: 0018:ffffc90000e976b0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880a2bb0000 RCX: ffffffff86369018
RDX: ffff8880a8dcc2c0 RSI: ffffffff8636916e RDI: 0000000000000001
RBP: ffffc90000e97770 R08: 0000000000000000 R09: ffffffff8a7b9707
R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a2bb0068 R14: ffffc90000e97718 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f091b46f018 CR3: 0000000097f54000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400