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 kernel/workqueue.c:1595
WARNING: CPU: 0 PID: 3553 at lib/debugobjects.c:484 debug_print_object+0x19f/0x2a0 lib/debugobjects.c:481
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 3553 Comm: kworker/u4:5 Not tainted 5.3.0-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+0x86/0xca lib/dump_stack.c:113
 panic+0x29a/0x523 kernel/panic.c:219
 __warn.cold.7+0x1b/0x36 kernel/panic.c:576
 report_bug+0x1a1/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x125/0x1d0 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x2d/0x40 arch/x86/entry/entry_64.S:1028
RIP: 0010:debug_print_object+0x19f/0x2a0 lib/debugobjects.c:481
Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d7 00 00 00 48 8b 14 dd 60 9f f8 8a 4c 89 f6 48 c7 c7 e0 3f d7 88 e8 68 75 bb fd <0f> 0b 83 05 1c 28 ef 08 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffff8880ab7af850 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff89f03f80 RDI: ffffffff8d50d1a0
RBP: ffff8880ab7af890 R08: ffffed10173c96f9 R09: ffffed10173c96f9
R10: ffffed10173c96f8 R11: ffff8880b9e4b7c7 R12: 0000000000000001
R13: ffffffff8a4e5be0 R14: ffffffff88d74640 R15: ffffffff815ac070
 __debug_check_no_obj_freed lib/debugobjects.c:963 [inline]
 debug_check_no_obj_freed+0x2cd/0x3fb lib/debugobjects.c:994
 slab_free_hook mm/slub.c:1420 [inline]
 slab_free_freelist_hook mm/slub.c:1474 [inline]
 slab_free mm/slub.c:3016 [inline]
 kfree+0x24b/0x3b0 mm/slub.c:3957
 kvfree+0x2c/0x30 mm/util.c:488
 netdev_freemem+0x47/0x60 net/core/dev.c:9095
 netdev_release+0x6c/0x90 net/core/net-sysfs.c:1635
 device_release+0x6a/0x1c0 drivers/base/core.c:1076
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x14f/0x410 lib/kobject.c:739
 netdev_run_todo+0x468/0x6f0 net/core/dev.c:9000
 rtnl_unlock+0x9/0x10 net/core/rtnetlink.c:112
 default_device_exit_batch+0x2e9/0x3d0 net/core/dev.c:9783
 ops_exit_list+0xd9/0x130 net/core/net_namespace.c:175
 cleanup_net+0x42b/0x940 net/core/net_namespace.c:594
 process_one_work+0x7d4/0x1620 kernel/workqueue.c:2269
 worker_thread+0x85/0xb60 kernel/workqueue.c:2415
 kthread+0x331/0x3f0 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	df 48 89             	fisttps -0x77(%rax)
   3:	fa                   	cli    
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   c:	0f 85 d7 00 00 00    	jne    0xe9
  12:	48 8b 14 dd 60 9f f8 	mov    -0x750760a0(,%rbx,8),%rdx
  19:	8a 
  1a:	4c 89 f6             	mov    %r14,%rsi
  1d:	48 c7 c7 e0 3f d7 88 	mov    $0xffffffff88d73fe0,%rdi
  24:	e8 68 75 bb fd       	callq  0xfdbb7591
  29:	0f 0b                	ud2     <-- trapping instruction
  2b:	83 05 1c 28 ef 08 01 	addl   $0x1,0x8ef281c(%rip)        # 0x8ef284e
  32:	48 83 c4 18          	add    $0x18,%rsp
  36:	5b                   	pop    %rbx
  37:	41 5c                	pop    %r12
  39:	41 5d                	pop    %r13
  3b:	41 5e                	pop    %r14
  3d:	41 5f                	pop    %r15