=============================
WARNING: suspicious RCU usage
6.8.0-rc3-next-20240205-syzkaller #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 syz-executor.1/13993:
 #0: ffffffff8e1314e0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e1314e0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2190 [inline]
 #0: ffffffff8e1314e0 (rcu_callback){....}-{0:0}, at: rcu_core+0xa86/0x1830 kernel/rcu/tree.c:2471

stack backtrace:
CPU: 0 PID: 13993 Comm: syz-executor.1 Not tainted 6.8.0-rc3-next-20240205-syzkaller #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+0x221/0x340 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:2196 [inline]
 rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2471
 __do_softirq+0x2bc/0x943 kernel/softirq.c:554
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:645
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1076 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5274
Code: c9 50 e8 09 cc 0b 00 48 83 c4 08 4c 89 f7 e8 1d 38 00 00 0f 1f 44 00 00 4c 89 f7 e8 a0 89 12 0a e8 9b 5b 35 00 fb 48 8b 5d c0 <48> 8d bb f0 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc9000fbe71c8 EFLAGS: 00000282
RAX: 95a3a8febd1a1e00 RBX: ffff88801e2c0000 RCX: ffffffff944a0603
RDX: dffffc0000000000 RSI: ffffffff8baab8a0 RDI: ffffffff8bfe7f40
RBP: ffffc9000fbe7210 R08: ffffffff8f85d4ef R09: 1ffffffff1f0ba9d
R10: dffffc0000000000 R11: fffffbfff1f0ba9e R12: 1ffff11017287b9f
R13: dffffc0000000000 R14: ffff8880b943cf80 R15: ffff8880b943dcf8
 context_switch kernel/sched/core.c:5403 [inline]
 __schedule+0x17e7/0x4a40 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6804 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6819
 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2159
 unix_wait_for_peer+0x250/0x340 net/unix/af_unix.c:1470
 unix_dgram_sendmsg+0x127a/0x1f80 net/unix/af_unix.c:2136
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmmsg+0x3b2/0x740 net/socket.c:2724
 __do_sys_sendmmsg net/socket.c:2753 [inline]
 __se_sys_sendmmsg net/socket.c:2750 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2750
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fb1a367dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb1a43770c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fb1a37abf80 RCX: 00007fb1a367dda9
RDX: 0000000000000318 RSI: 00000000200bd000 RDI: 0000000000000004
RBP: 00007fb1a36ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb1a37abf80 R15: 00007ffd2e2eb6b8
 </TASK>
----------------
Code disassembly (best guess):
   0:	c9                   	leave
   1:	50                   	push   %rax
   2:	e8 09 cc 0b 00       	call   0xbcc10
   7:	48 83 c4 08          	add    $0x8,%rsp
   b:	4c 89 f7             	mov    %r14,%rdi
   e:	e8 1d 38 00 00       	call   0x3830
  13:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  18:	4c 89 f7             	mov    %r14,%rdi
  1b:	e8 a0 89 12 0a       	call   0xa1289c0
  20:	e8 9b 5b 35 00       	call   0x355bc0
  25:	fb                   	sti
  26:	48 8b 5d c0          	mov    -0x40(%rbp),%rbx
* 2a:	48 8d bb f0 15 00 00 	lea    0x15f0(%rbx),%rdi <-- trapping instruction
  31:	48 89 f8             	mov    %rdi,%rax
  34:	48 c1 e8 03          	shr    $0x3,%rax
  38:	49                   	rex.WB
  39:	be 00 00 00 00       	mov    $0x0,%esi
  3e:	00 fc                	add    %bh,%ah