bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state ip6_tunnel: ip6gre1 xmit: Local address not yet configured! bond0 (unregistering): Released all slaves WARNING: CPU: 0 PID: 21 at net/core/dev.c:8022 rollback_registered_many+0xeca/0x1250 net/core/dev.c:8022 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 4.20.0-rc2+ #116 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+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:rollback_registered_many+0xeca/0x1250 net/core/dev.c:8022 Code: 57 19 00 00 48 c7 c6 e0 dd bc 88 48 c7 c7 20 de bc 88 c6 05 98 4d e2 03 01 e8 42 7f 18 fb 0f 0b e9 a6 f9 ff ff e8 c6 1b 4f fb <0f> 0b e9 7b f9 ff ff e8 ba 1b 4f fb 0f 0b e9 ea f9 ff ff e8 ae 1b RSP: 0018:ffff8881d9467058 EFLAGS: 00010293 RAX: ffff8881d945a580 RBX: ffff8881bef64940 RCX: ffffffff86306593 RDX: 0000000000000000 RSI: ffffffff86306c1a RDI: 0000000000000001 RBP: ffff8881d94672a0 R08: ffff8881d945a580 R09: fffffbfff13e1a38 R10: fffffbfff13e1a38 R11: ffffffff89f0d1c7 R12: dffffc0000000000 R13: 0000000000000001 R14: ffffffff8494d7c0 R15: ffff8881d9467138 unregister_netdevice_many+0xfa/0x4c0 net/core/dev.c:9107 default_device_exit_batch+0x43a/0x540 net/core/dev.c:9576 ops_exit_list.isra.5+0x105/0x160 net/core/net_namespace.c:156 cleanup_net+0x555/0xb10 net/core/net_namespace.c:551 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..