bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): Released all slaves
------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 arch/x86/include/asm/paravirt.h:752
WARNING: CPU: 0 PID: 453 at lib/debugobjects.c:488 debug_print_object+0x197/0x2b0 lib/debugobjects.c:485
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 453 Comm: kworker/u4:7 Not tainted 5.6.0-rc1-syzkaller #0
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+0x140/0x1a6 lib/dump_stack.c:118
 panic+0x2e1/0x5aa kernel/panic.c:221
 __warn.cold.10+0x25/0x2f kernel/panic.c:582
 report_bug+0x1ad/0x270 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x12d/0x230 arch/x86/kernel/traps.c:267
 do_invalid_op+0x31/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:debug_print_object+0x197/0x2b0 lib/debugobjects.c:485
Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e3 00 00 00 48 8b 14 dd 20 f5 25 8a 4c 89 ee 48 c7 c7 c0 f0 34 88 e8 e5 82 bd fd <0f> 0b 83 05 44 ae cf 07 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffc90002717980 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000007 RDI: ffffffff8d30d520
RBP: 0000000000000001 R08: ffffed1015c845d1 R09: ffffed1015c845d1
R10: ffffed1015c845d0 R11: ffff8880ae422e83 R12: ffffffff8977ae40
R13: ffffffff8834f740 R14: ffffffff815f8410 R15: ffff8880904fd360
 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
 debug_check_no_obj_freed+0x2d1/0x410 lib/debugobjects.c:998
 kfree+0xf4/0x330 mm/slab.c:3756
 device_release+0x65/0x1c0 drivers/base/core.c:1358
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x14b/0x210 lib/kobject.c:739
 netdev_run_todo+0x44c/0x6a0 net/core/dev.c:9656
 default_device_exit_batch+0x2d8/0x3b0 net/core/dev.c:10453
 cleanup_net+0x45a/0x900 net/core/net_namespace.c:589
 process_one_work+0x8ff/0x1690 kernel/workqueue.c:2264
 worker_thread+0x82/0xb50 kernel/workqueue.c:2410
 kthread+0x31d/0x3e0 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..