IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 kernel/workqueue.c:4943
WARNING: CPU: 0 PID: 14587 at lib/debugobjects.c:325 debug_print_object+0x160/0x250 lib/debugobjects.c:325
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 14587 Comm: kworker/u4:1 Not tainted 4.19.113-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
Workqueue: netns cleanup_net
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
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
batman_adv: batadv0: Interface activated: batadv_slave_0
 __warn.cold+0x20/0x46 kernel/panic.c:541
 report_bug+0x262/0x2a0 lib/bug.c:186
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
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!
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!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_1
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037
RIP: 0010:debug_print_object+0x160/0x250 lib/debugobjects.c:325
IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
Code: dd 60 0b ab 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd 60 0b ab 87 48 c7 c7 a0 00 ab 87 e8 0b 65 e6 fd <0f> 0b 83 05 13 11 37 06 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89
RSP: 0018:ffff888055b4f8e8 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8152d3a1 RDI: ffffed100ab69f0f
RBP: 0000000000000001 R08: ffff88808dcc0300 R09: fffffbfff117108d
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
R10: fffffbfff117108c R11: ffffffff88b88463 R12: ffffffff88b9faa0
R13: ffffffff81581ee0 R14: ffffffff8b8e2888 R15: ffff8880a92821e0
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
 __debug_check_no_obj_freed lib/debugobjects.c:785 [inline]
 debug_check_no_obj_freed+0x2a3/0x42e lib/debugobjects.c:817
 kfree+0xbb/0x220 mm/slab.c:3821
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
 kvfree+0x59/0x60 mm/util.c:452
 device_release+0x76/0x210 drivers/base/core.c:1061
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
 kobject_cleanup lib/kobject.c:662 [inline]
 kobject_release lib/kobject.c:691 [inline]
 kref_put include/linux/kref.h:70 [inline]
 kobject_put+0x17c/0x270 lib/kobject.c:708
 netdev_run_todo+0x4f1/0x740 net/core/dev.c:8981
IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
 default_device_exit_batch+0x309/0x3c0 net/core/dev.c:9766
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
 ops_exit_list.isra.0+0xef/0x140 net/core/net_namespace.c:156
8021q: adding VLAN 0 to HW filter on device batadv0
 cleanup_net+0x3bf/0x850 net/core/net_namespace.c:553
 process_one_work+0x91f/0x1640 kernel/workqueue.c:2155
 worker_thread+0x96/0xe20 kernel/workqueue.c:2298
 kthread+0x34a/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

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