------------[ cut here ]------------ IPv6: ADDRCONF(NETDEV_UP): veth1_vlan: link is not ready device veth0_vlan entered promiscuous mode ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 kernel/workqueue.c:4941 device veth1_vlan entered promiscuous mode WARNING: CPU: 0 PID: 23572 at lib/debugobjects.c:325 debug_print_object+0x168/0x250 lib/debugobjects.c:325 IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready Kernel panic - not syncing: panic_on_warn set ... IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready CPU: 0 PID: 23572 Comm: kworker/u4:6 Not tainted 4.19.99-syzkaller #0 IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 device veth0_macvtap entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready __warn.cold+0x20/0x53 kernel/panic.c:541 device veth1_macvtap entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready report_bug+0x263/0x2b0 lib/bug.c:186 IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296 IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 RIP: 0010:debug_print_object+0x168/0x250 lib/debugobjects.c:325 Code: dd 60 38 eb 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd 60 38 eb 87 48 c7 c7 a0 2d eb 87 e8 b6 74 d4 fd <0f> 0b 83 05 cb fc 63 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 RSP: 0018:ffff88804f3cf830 EFLAGS: 00010082 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81558c86 RDI: ffffed1009e79ef8 RBP: ffff88804f3cf870 R08: ffff88804e592380 R09: ffffed1015d03ee3 R10: ffffed1015d03ee2 R11: ffff8880ae81f717 R12: 0000000000000001 R13: ffffffff88fa2ce0 R14: ffffffff815b0270 R15: ffff88805a5222e0 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 __debug_check_no_obj_freed lib/debugobjects.c:785 [inline] debug_check_no_obj_freed+0x29f/0x464 lib/debugobjects.c:817 kfree+0xbd/0x220 mm/slab.c:3821 kvfree+0x61/0x70 mm/util.c:452 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! netdev_freemem+0x4c/0x60 net/core/dev.c:9065 netdev_release+0x86/0xb0 net/core/net-sysfs.c:1645 device_release+0x7b/0x210 drivers/base/core.c:926 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 kobject_cleanup lib/kobject.c:662 [inline] kobject_release lib/kobject.c:691 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put+0x193/0x290 lib/kobject.c:708 netdev_run_todo+0x53b/0x7a0 net/core/dev.c:8970 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:117 batman_adv: batadv0: Interface activated: batadv_slave_0 default_device_exit_batch+0x358/0x410 net/core/dev.c:9755 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! ops_exit_list.isra.0+0xfc/0x150 net/core/net_namespace.c:156 cleanup_net+0x404/0x960 net/core/net_namespace.c:553 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! process_one_work+0x989/0x1750 kernel/workqueue.c:2153 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready batman_adv: batadv0: Interface activated: batadv_slave_1 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready ======================================================