=============================
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
2 locks held by syz-executor.4/31304:
 #0: ffff88807da19e20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock include/linux/mmap_lock.h:108 [inline]
 #0: ffff88807da19e20 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0x30f/0xd40 mm/mmap.c:3287
 #1: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #1: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2184 [inline]
 #1: ffffffff8e130ba0 (rcu_callback){....}-{0:0}, at: rcu_core+0xcfc/0x1810 kernel/rcu/tree.c:2465

stack backtrace:
CPU: 1 PID: 31304 Comm: syz-executor.4 Not tainted 6.8.0-rc2-syzkaller-00419-gb555d191561a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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:lock_is_held_type+0x13a/0x190
Code: 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 42 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000ae47678 EFLAGS: 00000206
RAX: d24c8f207df81700 RBX: 0000000000000000 RCX: ffff88802f19bb80
RDX: 0000000000000000 RSI: ffffffff8baac6e0 RDI: ffffffff8bfd93e0
RBP: 0000000000000001 R08: ffffffff92c52457 R09: 1ffffffff258a48a
R10: dffffc0000000000 R11: fffffbfff258a48b R12: 0000000000000246
R13: ffff88802f19bb80 R14: 00000000ffffffff R15: ffffffff8e130b40
 lock_is_held include/linux/lockdep.h:231 [inline]
 __might_resched+0xa5/0x780 kernel/sched/core.c:10138
 exit_mmap+0x6bc/0xd40 mm/mmap.c:3305
 __mmput+0x115/0x3c0 kernel/fork.c:1343
 exit_mm+0x21f/0x310 kernel/exit.c:569
 do_exit+0x9af/0x2740 kernel/exit.c:858
 do_group_exit+0x206/0x2c0 kernel/exit.c:1020
 get_signal+0x176d/0x1850 kernel/signal.c:2893
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0xc8/0x370 kernel/entry/common.c:212
 do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f9e1be7dda9
Code: Unable to access opcode bytes at 0x7f9e1be7dd7f.
RSP: 002b:00007f9e1cc01178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f9e1bfabf88 RCX: 00007f9e1be7dda9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9e1bfabf88
RBP: 00007f9e1bfabf80 R08: 00007f9e1cc016c0 R09: 00007f9e1cc016c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9e1bfabf8c
R13: 000000000000000b R14: 00007ffebdd38250 R15: 00007ffebdd38338
 </TASK>
----------------
Code disassembly (best guess):
   0:	75 44                	jne    0x46
   2:	48 c7 04 24 00 00 00 	movq   $0x0,(%rsp)
   9:	00
   a:	9c                   	pushf
   b:	8f 04 24             	pop    (%rsp)
   e:	f7 04 24 00 02 00 00 	testl  $0x200,(%rsp)
  15:	75 4c                	jne    0x63
  17:	41 f7 c4 00 02 00 00 	test   $0x200,%r12d
  1e:	74 01                	je     0x21
  20:	fb                   	sti
  21:	65 48 8b 04 25 28 00 	mov    %gs:0x28,%rax
  28:	00 00
* 2a:	48 3b 44 24 08       	cmp    0x8(%rsp),%rax <-- trapping instruction
  2f:	75 42                	jne    0x73
  31:	89 d8                	mov    %ebx,%eax
  33:	48 83 c4 10          	add    $0x10,%rsp
  37:	5b                   	pop    %rbx
  38:	41 5c                	pop    %r12
  3a:	41 5d                	pop    %r13
  3c:	41 5e                	pop    %r14
  3e:	41 5f                	pop    %r15