------------[ cut here ]------------
ODEBUG: free active (active state 1) object: ffff88810ed4a680 object type: rcu_head hint: 0x0
WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230, CPU#0: kworker/u8:4/6993
Modules linked in:
CPU: 0 UID: 0 PID: 6993 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object+0x18a/0x230
Code: f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 6d e2 4d fd 4d 8b 0f 4c 89 ef 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f0 ff 34 24 <67> 48 0f b9 3a 48 83 c4 08 ff 05 b3 a5 90 0b 48 83 c4 10 5b 41 5c
RSP: 0018:ffffc90000007bd0 EFLAGS: 00010246
RAX: 1ffffffff181c818 RBX: dffffc0000000000 RCX: 0000000000000001
RDX: ffffffff8c6d9e40 RSI: ffffffff8c6d98c0 RDI: ffffffff908533a0
RBP: ffffffff8c6d9e40 R08: ffff88810ed4a680 R09: ffffffff8c0e4120
R10: dffffc0000000000 R11: fffffbfff20f4250 R12: 0000000000000001
R13: ffffffff908533a0 R14: ffff88810ed4a680 R15: ffffffff8c0e40c0
FS:  0000000000000000(0000) GS:ffff88818d6da000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c477b52 CR3: 00000001be4ac000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 debug_check_no_obj_freed+0x2e3/0x450
 __rcu_free_sheaf_prepare+0xdf/0x2a0
 rcu_free_sheaf+0x31/0x200
 rcu_core+0x926/0x1260
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__unwind_start+0x12e/0x660
Code: 48 89 ef e8 44 64 bf 00 4c 8d 6b 40 4c 89 7d 00 48 8d 6b 38 48 89 e8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df 42 80 3c 38 00 <74> 08 48 89 ef e8 18 64 bf 00 4c 89 65 00 4c 89 e8 48 c1 e8 03 42
RSP: 0018:ffffc9000677f4b0 EFLAGS: 00000246
RAX: 1ffff92000cefea8 RBX: ffffc9000677f508 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000677f568
RBP: ffffc9000677f540 R08: ffffc9000677f567 R09: 0000000000000000
R10: ffffc9000677f508 R11: fffff52000cefead R12: ffffc9000677f4b0
R13: ffffc9000677f548 R14: 1ffff92000cefea6 R15: dffffc0000000000
 arch_stack_walk+0xe3/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x650
 ops_undo_list+0x7b9/0x8d0
 cleanup_net+0x572/0x810
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
