bond71 (unregistering): Released all slaves
bond70 (unregistering): Released all slaves
bond69 (unregistering): Released all slaves
bond68 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 1 PID: 252 at net/core/dev.c:7226 rollback_registered_many+0x85d/0xa70 net/core/dev.c:7226
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 252 Comm: kworker/u4:2 Not tainted 4.14.184-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+0x2f/0x30 kernel/panic.c:547
 report_bug+0x20a/0x248 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+0x85d/0xa70 net/core/dev.c:7226
RSP: 0018:ffff8880a95ffa80 EFLAGS: 00010297
RAX: ffff8880a95f2040 RBX: ffff8880a95ffb98 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8880a95f2940 RDI: ffff88804f581e40
RBP: ffff88804f581e40 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a95ffab8 R14: ffff88808d634000 R15: ffffffff83d19440
 unregister_netdevice_many.part.0+0x16/0x1d0 net/core/dev.c:8281
 unregister_netdevice_many net/core/dev.c:8280 [inline]
 default_device_exit_batch+0x2dd/0x380 net/core/dev.c:8742
 ops_exit_list.isra.0+0xef/0x140 net/core/net_namespace.c:145
 cleanup_net+0x3bb/0x820 net/core/net_namespace.c:484
 process_one_work+0x7c0/0x14c0 kernel/workqueue.c:2116
 worker_thread+0x5d7/0x1080 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..