------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x80
WARNING: CPU: 1 PID: 977 at lib/debugobjects.c:508 debug_print_object lib/debugobjects.c:505 [inline]
WARNING: CPU: 1 PID: 977 at lib/debugobjects.c:508 __debug_check_no_obj_freed lib/debugobjects.c:992 [inline]
WARNING: CPU: 1 PID: 977 at lib/debugobjects.c:508 debug_check_no_obj_freed+0x44b/0x650 lib/debugobjects.c:1023
Modules linked in:
CPU: 1 PID: 977 Comm: kworker/u4:4 Not tainted 5.17.0-rc6-syzkaller-00046-g719fce7539cd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object lib/debugobjects.c:505 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:992 [inline]
RIP: 0010:debug_check_no_obj_freed+0x44b/0x650 lib/debugobjects.c:1023
Code: 4c 89 ef e8 e7 e8 b2 fd 4d 8b 45 00 48 c7 c7 e0 7c d6 8a 48 c7 c6 00 79 d6 8a 48 89 da 44 89 f1 4d 89 f9 31 c0 e8 65 cb 2f fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df ff 05 ff 24 e1 09 48 8b 5c 24
RSP: 0018:ffffc900044df748 EFLAGS: 00010246
RAX: 996ced11ad40e800 RBX: ffffffff8ad67ea0 RCX: ffff88801c189d00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff8880706acef8 R08: ffffffff816aea02 R09: ffffed10173667f9
R10: ffffed10173667f9 R11: 0000000000000000 R12: ffff8880706acef4
R13: ffffffff8a71abe0 R14: 0000000000000000 R15: ffffffff81561930
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f55e67dfe97 CR3: 000000006c082000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 slab_free_hook mm/slub.c:1703 [inline]
 slab_free_freelist_hook+0xcf/0x1a0 mm/slub.c:1754
 slab_free mm/slub.c:3509 [inline]
 kfree+0xb8/0x2e0 mm/slub.c:4562
 device_release+0x98/0x1c0
 kobject_cleanup+0x1c0/0x280 lib/kobject.c:705
 netdev_run_todo+0xb6f/0xd00 net/core/dev.c:9973
 default_device_exit_batch+0x450/0x4b0 net/core/dev.c:10946
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x80c/0xc70 net/core/net_namespace.c:597
 process_one_work+0x86c/0x1190 kernel/workqueue.c:2307
 worker_thread+0xab1/0x1300 kernel/workqueue.c:2454
 kthread+0x2a3/0x2d0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30
 </TASK>