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 kernel/workqueue.c:1595
WARNING: CPU: 0 PID: 100 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: 100 Comm: kworker/u4:2 Not tainted 5.9.0-rc5-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+0x99/0xd0 lib/dump_stack.c:118
 panic+0x2a9/0x532 kernel/panic.c:231
 __warn.cold.12+0x25/0x32 kernel/panic.c:600
 report_bug+0x1af/0x260 lib/bug.c:198
 handle_bug+0x3f/0x70 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
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 80 5d 2b 8b 4c 89 ee 48 c7 c7 a0 17 fd 88 e8 1e 2d ab fd <0f> 0b 83 05 ec d0 28 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffc900011af8d8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8a2c1720 RDI: ffffffff8eb2fee0
RBP: 0000000000000001 R08: ffffed10173c612d R09: ffffed10173c612d
R10: ffff8880b9e30967 R11: ffffed10173c612c R12: ffffffff8a73f160
R13: ffffffff88fd1da0 R14: ffffffff815be0f0 R15: ffff8880a0fd1480
 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
 debug_check_no_obj_freed+0x2d5/0x414 lib/debugobjects.c:998
 slab_free_hook mm/slub.c:1540 [inline]
 slab_free_freelist_hook+0x105/0x150 mm/slub.c:1581
 slab_free mm/slub.c:3142 [inline]
 kfree+0xdd/0x660 mm/slub.c:4123
 device_release+0x65/0x1c0 drivers/base/core.c:1796
 kobject_cleanup lib/kobject.c:705 [inline]
 kobject_release lib/kobject.c:736 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x148/0x430 lib/kobject.c:753
 netdev_run_todo+0x42b/0x6a0 net/core/dev.c:10113
 default_device_exit_batch+0x2d8/0x3b0 net/core/dev.c:10913
 cleanup_net+0x45a/0x900 net/core/net_namespace.c:603
 process_one_work+0x8e9/0x1690 kernel/workqueue.c:2269
 worker_thread+0x82/0xb50 kernel/workqueue.c:2415
 kthread+0x36b/0x440 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Kernel Offset: disabled
Rebooting in 86400 seconds..