device veth0_macvtap left promiscuous mode
device veth1_vlan left promiscuous mode
device veth0_vlan left promiscuous mode
bond1 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8544 at net/core/dev.c:7223 rollback_registered_many+0x959/0xba0 net/core/dev.c:7223
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8544 Comm: kworker/u4:5 Not tainted 4.14.210-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x4b kernel/panic.c:547
 report_bug+0x208/0x249 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:rollback_registered_many+0x959/0xba0 net/core/dev.c:7223
RSP: 0018:ffff88805a437aa8 EFLAGS: 00010297
RAX: ffff88805a42a140 RBX: ffff888050668480 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88805a42aa40 RDI: 0000000000000000
RBP: ffff88805a437bc8 R08: ffffffff89d15c40 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88805a437ae0 R14: ffff888050668530 R15: ffffffff83d7e520
 unregister_netdevice_many.part.0+0x18/0x2e0 net/core/dev.c:8285
 unregister_netdevice_many net/core/dev.c:8284 [inline]
 default_device_exit_batch+0x2d8/0x380 net/core/dev.c:8746
 ops_exit_list+0xf9/0x150 net/core/net_namespace.c:145
 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Kernel Offset: disabled
Rebooting in 86400 seconds..