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ODEBUG: activate active (active state 0) object: ffff88809175e3d8 object type: rcu_head hint: 0x0
WARNING: lib/debugobjects.c:629 at debug_print_object+0x198/0x2b0 lib/debugobjects.c:629, CPU#1: syz.5.5391/26030
Modules linked in:
CPU: 1 UID: 0 PID: 26030 Comm: syz.5.5391 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:debug_print_object+0x1a5/0x2b0 lib/debugobjects.c:629
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 68 9c 06 0c 41 56 48 8b 14 ed 40 1d 40 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 92 c5 fb 0b 01 48 83 c4 18 5b 5d 41 5c 41
RSP: 0018:ffffc90000a08ad8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffc90000a08b80 RCX: 0000000000000000
RDX: ffffffff8c401c80 RSI: ffffffff8c401860 RDI: ffffffff912d2c30
RBP: 0000000000000003 R08: ffff88809175e3d8 R09: ffffffff8bd16bc0
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c401860
R13: ffffffff8bd16c00 R14: 0000000000000000 R15: ffffc90000a08b98
FS:  00007fc0176356c0(0000) GS:ffff888123eee000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7432a276c8 CR3: 000000003741b000 CR4: 00000000003526f0
DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000404
DR3: ffffffffefffff14 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 debug_object_activate+0x2ba/0x4b0 lib/debugobjects.c:905
 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline]
 __call_rcu_common.constprop.0+0x35/0x9b0 kernel/rcu/tree.c:3144
 radix_tree_node_free lib/radix-tree.c:310 [inline]
 delete_node+0x200/0x8f0 lib/radix-tree.c:573
 __radix_tree_delete+0x193/0x3d0 lib/radix-tree.c:1379
 radix_tree_delete_item+0xea/0x230 lib/radix-tree.c:1430
 afs_cell_destroy+0x1db/0x2d0 fs/afs/cell.c:580
 rcu_do_batch kernel/rcu/tree.c:2645 [inline]
 rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2897
 handle_softirqs+0x1ea/0x9b0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 bb bf 7d 12 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 06 c1 3c 0f 0f 82 ac 02 00 00 8b 35 ce f4 3c 0f 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 5d bf 7d 12 0f 85 ec 02 00 00 48 83 c4
RSP: 0018:ffffc900052e7668 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 1dc3f77d480dfb34
RDX: 0000000000000000 RSI: ffffffff8e17c6a8 RDI: ffffffff8c400b80
RBP: ffff888035ea5af0 R08: 00000000ffffffff R09: 0000000000000640
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
 __mutex_lock_common kernel/locking/mutex.c:646 [inline]
 __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821
 __unix_dgram_recvmsg+0x255/0xc30 net/unix/af_unix.c:2579
 unix_dgram_recvmsg+0xcd/0x100 net/unix/af_unix.c:2681
 sock_recvmsg_nosec net/socket.c:1126 [inline]
 ____sys_recvmsg+0x5eb/0x670 net/socket.c:2902
 ___sys_recvmsg+0x16a/0x1a0 net/socket.c:2946
 do_recvmmsg+0x2f3/0x740 net/socket.c:3041
 __sys_recvmmsg net/socket.c:3115 [inline]
 __do_sys_recvmmsg net/socket.c:3138 [inline]
 __se_sys_recvmmsg net/socket.c:3131 [inline]
 __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3131
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc01679de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc017635028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007fc016a26090 RCX: 00007fc01679de59
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000007
RBP: 00007fc016833e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc016a26128 R14: 00007fc016a26090 R15: 00007ffd9320ac88
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 00 00 00 00       	mov    $0x0,%eax
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	lcall  (bad)
   8:	df 48 89             	fisttps -0x77(%rax)
   b:	fa                   	cli
   c:	48 c1 ea 03          	shr    $0x3,%rdx
  10:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  14:	75 4f                	jne    0x65
  16:	48 8d 3d 68 9c 06 0c 	lea    0xc069c68(%rip),%rdi        # 0xc069c85
  1d:	41 56                	push   %r14
  1f:	48 8b 14 ed 40 1d 40 	mov    -0x73bfe2c0(,%rbp,8),%rdx
  26:	8c
  27:	4c 89 e6             	mov    %r12,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	58                   	pop    %rax
  30:	83 05 92 c5 fb 0b 01 	addl   $0x1,0xbfbc592(%rip)        # 0xbfbc5c9
  37:	48 83 c4 18          	add    $0x18,%rsp
  3b:	5b                   	pop    %rbx
  3c:	5d                   	pop    %rbp
  3d:	41 5c                	pop    %r12
  3f:	41                   	rex.B