------------[ cut here ]------------
ODEBUG: activate active (active state 0) object: ffff88804f61aed8 object type: rcu_head hint: 0x0
WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#1: rcuc/1/29
Modules linked in:
CPU: 1 UID: 0 PID: 29 Comm: rcuc/1 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:debug_print_object+0x18a/0x230 lib/debugobjects.c:629
Code: f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 8d e3 6e 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 53 14 ed 0a 48 83 c4 10 5b 41 5c
RSP: 0018:ffffc90000a3f988 EFLAGS: 00010246
RAX: 1ffffffff169c2ac RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffffff8baa7920 RSI: ffffffff8baa7340 RDI: ffffffff8fb76f20
RBP: ffffffff8baa7920 R08: ffff88804f61aed8 R09: ffffffff8b4e15c0
R10: dffffc0000000000 R11: fffffbfff1f59a7f R12: 0000000000000000
R13: ffffffff8fb76f20 R14: ffff88804f61aed8 R15: ffffffff8b4e1560
FS:  0000000000000000(0000) GS:ffff888125dc7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc21432c90 CR3: 000000003fcba000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 debug_object_activate+0x256/0x3a0 lib/debugobjects.c:859
 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline]
 __call_rcu_common kernel/rcu/tree.c:3116 [inline]
 call_rcu+0x43/0x890 kernel/rcu/tree.c:3251
 radix_tree_node_free lib/radix-tree.c:310 [inline]
 delete_node+0x1bc/0xa60 lib/radix-tree.c:573
 radix_tree_delete_item+0x2ef/0x400 lib/radix-tree.c:1430
 afs_cell_destroy+0x16f/0x2c0 fs/afs/cell.c:580
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core kernel/rcu/tree.c:2869 [inline]
 rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2957
 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	f8                   	clc
   1:	48 c1 e8 03          	shr    $0x3,%rax
   5:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
   9:	74 08                	je     0x13
   b:	4c 89 ff             	mov    %r15,%rdi
   e:	e8 8d e3 6e fd       	call   0xfd6ee3a0
  13:	4d 8b 0f             	mov    (%r15),%r9
  16:	4c 89 ef             	mov    %r13,%rdi
  19:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  1e:	48 89 ea             	mov    %rbp,%rdx
  21:	44 89 e1             	mov    %r12d,%ecx
  24:	4d 89 f0             	mov    %r14,%r8
  27:	ff 34 24             	push   (%rsp)
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 83 c4 08          	add    $0x8,%rsp
  33:	ff 05 53 14 ed 0a    	incl   0xaed1453(%rip)        # 0xaed148c
  39:	48 83 c4 10          	add    $0x10,%rsp
  3d:	5b                   	pop    %rbx
  3e:	41 5c                	pop    %r12