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:1590
WARNING: CPU: 1 PID: 1192 at lib/debugobjects.c:488 debug_print_object+0x197/0x2b0 lib/debugobjects.c:485
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 1192 Comm: kworker/u4:7 Not tainted 5.6.0-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+0x96/0xe0 lib/dump_stack.c:118
 panic+0x2a1/0x52a kernel/panic.c:221
 __warn.cold.10+0x25/0x2f kernel/panic.c:582
 report_bug+0x1aa/0x260 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x12d/0x1e0 arch/x86/kernel/traps.c:267
 do_invalid_op+0x31/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x2d/0x40 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 40 1b e3 8a 4c 89 ee 48 c7 c7 20 08 ba 88 e8 85 e2 ba fd <0f> 0b 83 05 a4 6d e5 08 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffc90005177980 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000007 RDI: ffffffff8e504220
RBP: 0000000000000001 R08: ffffed10173e43e9 R09: ffffed10173e43e9
R10: ffffed10173e43e8 R11: ffff8880b9f21f43 R12: ffffffff8a2ffc80
R13: ffffffff88ba0e20 R14: ffffffff8158e930 R15: ffff8880aae59360
 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
 debug_check_no_obj_freed+0x2d1/0x410 lib/debugobjects.c:998
 kfree+0xca/0x270 mm/slab.c:3756
 device_release+0x65/0x1c0 drivers/base/core.c:1371
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x191/0x430 lib/kobject.c:739
 netdev_run_todo+0x44c/0x6a0 net/core/dev.c:9646
 default_device_exit_batch+0x2d8/0x3b0 net/core/dev.c:10443
 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..