device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
bond2 (unregistering): Released all slaves
bond1 (unregistering): Released all slaves
bond0 (unregistering): Released all slaves
WARNING: CPU: 0 PID: 8188 at net/core/dev.c:7973 rollback_registered_many+0xe8b/0x1210 net/core/dev.c:7973
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8188 Comm: kworker/u4:7 Not tainted 4.19.0-rc5+ #237
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:77 [inline]
 dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993
RIP: 0010:rollback_registered_many+0xe8b/0x1210 net/core/dev.c:7973
Code: 28 19 00 00 48 c7 c6 40 4b 98 88 48 c7 c7 e0 4c 98 88 c6 05 a2 18 e3 03 01 e8 d1 ec 3c fb 0f 0b e9 e5 f9 ff ff e8 c5 f9 72 fb <0f> 0b e9 ba f9 ff ff e8 b9 f9 72 fb 0f 0b e9 29 fa ff ff e8 ad f9
RSP: 0018:ffff88019bfff058 EFLAGS: 00010293
RAX: ffff8801c0ab4280 RBX: ffff880198570700 RCX: ffffffff860bb573
RDX: 0000000000000000 RSI: ffffffff860bbbbb RDI: 0000000000000001
RBP: ffff88019bfff2a0 R08: ffff8801c0ab4280 R09: fffffbfff139a628
R10: fffffbfff139a628 R11: ffffffff89cd3147 R12: dffffc0000000000
R13: 0000000000000001 R14: ffffffff84801f50 R15: ffff88019bfff138
 unregister_netdevice_many+0xfa/0x4c0 net/core/dev.c:9058
 default_device_exit_batch+0x43a/0x540 net/core/dev.c:9527
 ops_exit_list.isra.7+0x105/0x160 net/core/net_namespace.c:156
 cleanup_net+0x555/0xb10 net/core/net_namespace.c:551
 process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Kernel Offset: disabled
Rebooting in 86400 seconds..