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: 1 PID: 21 at lib/debugobjects.c:488 debug_print_object+0x160/0x210 lib/debugobjects.c:485
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.5.0-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+0x128/0x182 lib/dump_stack.c:118
 panic+0x22a/0x4e3 kernel/panic.c:221
 __warn.cold.10+0x25/0x26 kernel/panic.c:582
 report_bug+0x1ad/0x270 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:176 [inline]
 do_error_trap+0x123/0x210 arch/x86/kernel/traps.c:269
 do_invalid_op+0x31/0x40 arch/x86/kernel/traps.c:288
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:debug_print_object+0x160/0x210 lib/debugobjects.c:485
Code: ad 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 96 00 00 00 48 8b 14 dd 00 9d ad 87 4c 89 f6 48 c7 c7 60 92 ad 87 e8 bc 00 fa fd <0f> 0b 83 05 4b b0 55 06 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffc90000dd7980 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000007 RDI: ffffffff8b62d460
RBP: 0000000000000001 R08: ffffed1015d245d1 R09: ffffed1015d245d1
R10: ffffed1015d245d0 R11: ffff8880ae922e83 R12: ffffffff88baf040
R13: ffffffff81585850 R14: ffffffff87ad9960 R15: ffff8880a444d360
 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
 debug_check_no_obj_freed+0x2e0/0x456 lib/debugobjects.c:998
 kfree+0xf4/0x2b0 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+0x417/0x640 net/core/dev.c:9656
 default_device_exit_batch+0x2d8/0x3b0 net/core/dev.c:10453
 cleanup_net+0x45f/0x910 net/core/net_namespace.c:589
 process_one_work+0x903/0x15c0 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..