bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): Released all slaves
bond1 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 0 PID: 18982 at net/core/dev.c:9518 rollback_registered_many+0x10eb/0x14c0 net/core/dev.c:9518
Modules linked in:
CPU: 1 PID: 18982 Comm: kworker/u4:7 Not tainted 5.11.0-rc3-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+0x10eb/0x14c0 net/core/dev.c:9518
Code: 96 1b 00 00 48 c7 c6 60 f9 43 8a 48 c7 c7 a0 f9 43 8a c6 05 92 2b f8 05 01 e8 65 8a c1 01 0f 0b e9 b3 fb ff ff e8 85 95 7b fa <0f> 0b e9 8a fb ff ff e8 39 50 be fa e9 c5 f0 ff ff 4c 89 ef e8 5c
RSP: 0018:ffffc900018bf9e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000025218301 RCX: 0000000000000000
RDX: ffff888071810000 RSI: ffffffff86f7343b RDI: 0000000000000003
RBP: ffff8880209a9080 R08: 0000000000000000 R09: 0000000025218301
R10: ffffffff86f72fc4 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888024eac000 R14: dffffc0000000000 R15: ffff8880209a9080
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005604b8eb96e8 CR3: 000000001bf83000 CR4: 0000000000350ef0
Call Trace:
 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10730
 unregister_netdevice_many net/core/dev.c:10729 [inline]
 default_device_exit_batch+0x30c/0x3d0 net/core/dev.c:11213
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:190
 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:604
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296