bond0: Enslaving bond_slave_0 as an active interface with an up link ------------[ cut here ]------------ bond0: Enslaving bond_slave_1 as an active interface with an up link ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 kernel/workqueue.c:4941 IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready WARNING: CPU: 1 PID: 7177 at lib/debugobjects.c:325 debug_print_object+0x160/0x250 lib/debugobjects.c:325 team0: Port device team_slave_0 added Kernel panic - not syncing: panic_on_warn set ... IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready CPU: 1 PID: 7177 Comm: kworker/u4:6 Not tainted 4.19.108-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net team0: Port device team_slave_1 added 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: batadv0: Adding interface: batadv_slave_0 batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active batman_adv: batadv0: Adding interface: batadv_slave_1 __warn.cold+0x20/0x46 kernel/panic.c:541 batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active report_bug+0x262/0x2a0 lib/bug.c:186 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 IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 RIP: 0010:debug_print_object+0x160/0x250 lib/debugobjects.c:325 Code: dd 60 0f ab 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd 60 0f ab 87 48 c7 c7 a0 04 ab 87 e8 1b f7 e6 fd <0f> 0b 83 05 63 a1 37 06 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89 RSP: 0018:ffff888041d778e8 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8152d2f1 RDI: ffffed10083aef0f RBP: 0000000000000001 R08: ffff88804bae4680 R09: fffffbfff117108d R10: fffffbfff117108c R11: ffffffff88b88463 R12: ffffffff88b9faa0 R13: ffffffff81581e30 R14: ffffffff8b8959c8 R15: ffff888046352220 __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 kvfree+0x59/0x60 mm/util.c:452 device_release+0x76/0x210 drivers/base/core.c:926 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 default_device_exit_batch+0x309/0x3c0 net/core/dev.c:9766 ops_exit_list.isra.0+0xef/0x140 net/core/net_namespace.c:156 cleanup_net+0x3bf/0x850 net/core/net_namespace.c:553 process_one_work+0x91f/0x1640 kernel/workqueue.c:2153 worker_thread+0x96/0xe20 kernel/workqueue.c:2296 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 ======================================================