=============================
WARNING: suspicious RCU usage
6.8.0-rc2-syzkaller-00419-gb555d191561a #0 Not tainted
-----------------------------
net/netfilter/ipset/ip_set_hash_gen.h:455 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by kworker/u4:5/25380:
 #0: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2184 [inline]
 #0: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_core+0xcfc/0x1810 kernel/rcu/tree.c:2465

stack backtrace:
CPU: 0 PID: 25380 Comm: kworker/u4:5 Not tainted 6.8.0-rc2-syzkaller-00419-gb555d191561a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue:  0x0 (events_unbound)
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 lockdep_rcu_suspicious+0x220/0x340 kernel/locking/lockdep.c:6712
 hash_netportnet6_destroy+0xf0/0x2c0 net/netfilter/ipset/ip_set_hash_gen.h:455
 ip_set_destroy_set net/netfilter/ipset/ip_set_core.c:1180 [inline]
 ip_set_destroy_set_rcu+0x6a/0xe0 net/netfilter/ipset/ip_set_core.c:1190
 rcu_do_batch kernel/rcu/tree.c:2190 [inline]
 rcu_core+0xd76/0x1810 kernel/rcu/tree.c:2465
 __do_softirq+0x2bb/0x942 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ea dc 08 f6 48 89 df e8 a2 1c 0a f6 e8 1d 3a 32 f6 fb bf 01 00 00 00 <e8> b2 ed fb f5 65 8b 05 03 65 9b 74 85 c0 74 06 5b c3 cc cc cc cc
RSP: 0018:ffffc900146a7dc8 EFLAGS: 00000282
RAX: d49f67544d8d3800 RBX: ffff888014ca1000 RCX: ffffffff9444a303
RDX: dffffc0000000000 RSI: ffffffff8baab560 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff8f84296f R09: 1ffffffff1f0852d
R10: dffffc0000000000 R11: fffffbfff1f0852e R12: ffff888014ca1000
R13: ffff88801f92b000 R14: ffff888014ca1060 R15: ffff88801f92b058
 worker_thread+0xc21/0x1000 kernel/workqueue.c:2801
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	f3 0f 1e fa          	endbr64
   5:	53                   	push   %rbx
   6:	48 89 fb             	mov    %rdi,%rbx
   9:	48 83 c7 18          	add    $0x18,%rdi
   d:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  12:	e8 ea dc 08 f6       	call   0xf608dd01
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 a2 1c 0a f6       	call   0xf60a1cc1
  1f:	e8 1d 3a 32 f6       	call   0xf6323a41
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 b2 ed fb f5       	call   0xf5fbede1 <-- trapping instruction
  2f:	65 8b 05 03 65 9b 74 	mov    %gs:0x749b6503(%rip),%eax        # 0x749b6539
  36:	85 c0                	test   %eax,%eax
  38:	74 06                	je     0x40
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	cc                   	int3
  3d:	cc                   	int3
  3e:	cc                   	int3
  3f:	cc                   	int3