------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x10 arch/x86/include/asm/paravirt.h:765
WARNING: CPU: 1 PID: 924 at lib/debugobjects.c:488 debug_print_object+0x71/0xc0 lib/debugobjects.c:485
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 924 Comm: kworker/u4:4 Not tainted 5.8.0-rc3-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+0xb3/0xec lib/dump_stack.c:118
 panic+0x14e/0x333 kernel/panic.c:231
 __warn.cold.13+0x20/0x2c kernel/panic.c:600
 report_bug+0xc0/0xf0 lib/bug.c:198
 handle_bug+0x35/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x13/0x60 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563
RIP: 0010:debug_print_object+0x71/0xc0 lib/debugobjects.c:485
Code: 8b 5b 10 89 15 14 fa 2f 04 4c 8b 45 00 48 83 fb 05 77 31 48 8b 14 dd a0 a6 7a 83 4c 89 e6 48 c7 c7 00 25 f3 83 e8 4a 77 40 ff <0f> 0b 83 05 6a be 9b 02 01 48 83 c4 18 5b 5d 41 5c c3 83 05 5a be
RSP: 0018:ffffc90001a6fc40 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000001
RDX: 0000000080000001 RSI: ffffffff84039fce RDI: 00000000ffffffff
RBP: ffffffff84307f80 R08: 0000000000000001 R09: 0000000000000008
R10: 0000000000000001 R11: f847c98e7ca04776 R12: ffffffff83f1044c
R13: ffff888127a16320 R14: 0000000000000005 R15: ffffffff84307f80
 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
 debug_check_no_obj_freed+0x1bb/0x1dd lib/debugobjects.c:998
 kfree+0xfa/0x2a0 mm/slab.c:3756
 device_release+0x1f/0x70 drivers/base/core.c:1559
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x64/0x90 lib/kobject.c:739
 netdev_run_todo+0x1d9/0x290 net/core/dev.c:9797
 default_device_exit_batch+0x150/0x170 net/core/dev.c:10597
 cleanup_net+0x273/0x3d0 net/core/net_namespace.c:603
 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269
 worker_thread+0x38/0x380 kernel/workqueue.c:2415
 kthread+0x148/0x170 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Kernel Offset: disabled
Rebooting in 86400 seconds..