=============================
WARNING: suspicious RCU usage
6.8.0-rc3-syzkaller-00010-g6d280f4d760e #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/6715:
 #0: ffffffff8d7ad040 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8d7ad040 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2184 [inline]
 #0: ffffffff8d7ad040 (rcu_callback){....}-{0:0}, at: rcu_core+0x7bd/0x1680 kernel/rcu/tree.c:2465

stack backtrace:
CPU: 1 PID: 6715 Comm: syz-fuzzer Not tainted 6.8.0-rc3-syzkaller-00010-g6d280f4d760e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 lockdep_rcu_suspicious+0x20c/0x3b0 kernel/locking/lockdep.c:6712
 hash_netportnet6_destroy+0x2c4/0x3a0 net/netfilter/ipset/ip_set_hash_gen.h:455
 ip_set_destroy_set+0x65/0x100 net/netfilter/ipset/ip_set_core.c:1180
 rcu_do_batch kernel/rcu/tree.c:2190 [inline]
 rcu_core+0x819/0x1680 kernel/rcu/tree.c:2465
 __do_softirq+0x21c/0x8e7 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xbb/0x120 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x48/0xb0 arch/x86/kernel/apic/apic.c:1076
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0033:0x413aec
Code: c9 74 09 90 48 8d 51 08 31 db eb 16 48 8d 05 eb 43 d4 01 31 db 48 83 c4 10 5d c3 48 ff c3 48 83 c2 04 48 83 fb 08 73 c7 8b 32 <39> 74 24 30 75 eb 0f b6 34 0b 40 80 fe 01 76 e1 0f b6 50 51 48 0f
RSP: 002b:000000c0019a9348 EFLAGS: 00000293
RAX: 0000000000ac9160 RBX: 0000000000000000 RCX: 000000c005126088
RDX: 000000c005126090 RSI: 0000000088a75c35 RDI: 0000000000ac9160
RBP: 000000c0019a9358 R08: 0000000000000038 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000004 R12: 000000c0006e14e0
R13: 0000000000000004 R14: 000000c0000061a0 R15: 000000c0006e14c8
 </TASK>

=============================
WARNING: suspicious RCU usage
6.8.0-rc3-syzkaller-00010-g6d280f4d760e #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 ksoftirqd/1/22:
 #0: ffffffff8d7ad040 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8d7ad040 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2184 [inline]
 #0: ffffffff8d7ad040 (rcu_callback){....}-{0:0}, at: rcu_core+0x7bd/0x1680 kernel/rcu/tree.c:2465

stack backtrace:
CPU: 1 PID: 22 Comm: ksoftirqd/1 Not tainted 6.8.0-rc3-syzkaller-00010-g6d280f4d760e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 lockdep_rcu_suspicious+0x20c/0x3b0 kernel/locking/lockdep.c:6712
 hash_ipmark4_destroy+0x2c4/0x3a0 net/netfilter/ipset/ip_set_hash_gen.h:455
 ip_set_destroy_set+0x65/0x100 net/netfilter/ipset/ip_set_core.c:1180
 rcu_do_batch kernel/rcu/tree.c:2190 [inline]
 rcu_core+0x819/0x1680 kernel/rcu/tree.c:2465
 __do_softirq+0x21c/0x8e7 kernel/softirq.c:553
 run_ksoftirqd kernel/softirq.c:921 [inline]
 run_ksoftirqd+0x35/0x60 kernel/softirq.c:913
 smpboot_thread_fn+0x669/0xa20 kernel/smpboot.c:164
 kthread+0x2c6/0x3b0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>