=============================
WARNING: suspicious RCU usage
6.8.0-rc3-syzkaller-gf735966ee23c #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-fuzzer/6220:
 #0: ffff80008ee44080 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire+0xc/0x3c include/linux/rcupdate.h:297

stack backtrace:
CPU: 0 PID: 6220 Comm: syz-fuzzer Not tainted 6.8.0-rc3-syzkaller-gf735966ee23c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 dump_stack+0x1c/0x28 lib/dump_stack.c:113
 lockdep_rcu_suspicious+0x260/0x464 kernel/locking/lockdep.c:6712
 hash_netportnet6_destroy+0xe0/0x268 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+0x6c/0xe8 net/netfilter/ipset/ip_set_core.c:1190
 rcu_do_batch kernel/rcu/tree.c:2190 [inline]
 rcu_core+0x890/0x1b34 kernel/rcu/tree.c:2465
 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2482
 __do_softirq+0x2d8/0xce4 kernel/softirq.c:553
 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81
 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889
 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86
 do_softirq+0x90/0xf8 kernel/softirq.c:454
 __local_bh_enable_ip+0x288/0x44c kernel/softirq.c:381
 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:33
 put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:244 [inline]
 fpsimd_restore_current_state+0x64/0xec arch/arm64/kernel/fpsimd.c:1755
 do_notify_resume+0x1960/0x393c arch/arm64/kernel/signal.c:1308
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline]
 el0_svc+0x9c/0x158 arch/arm64/kernel/entry-common.c:679
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598