=============================
WARNING: suspicious RCU usage
6.1.95-syzkaller #0 Not tainted
-----------------------------
net/netfilter/ipset/ip_set_core.c:1202 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u4:3/46:
 #0: ffff888012616938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: 
ffffc90000b77d20
 (net_cleanup_work
){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #2: ffffffff8e28d9d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf1/0xb60 net/core/net_namespace.c:566

stack backtrace:
CPU: 1 PID: 46 Comm: kworker/u4:3 Not tainted 6.1.95-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: netns cleanup_net

Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 lockdep_rcu_suspicious+0x21c/0x330 kernel/locking/lockdep.c:6592
 _destroy_all_sets+0x22c/0x5e0 net/netfilter/ipset/ip_set_core.c:1202
 ip_set_net_exit+0x1c/0x50 net/netfilter/ipset/ip_set_core.c:2398
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x6ce/0xb60 net/core/net_namespace.c:604
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

=============================
WARNING: suspicious RCU usage
6.1.95-syzkaller #0 Not tainted
-----------------------------
net/netfilter/ipset/ip_set_core.c:1213 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u4:3/46:
 #0: ffff888012616938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc90000b77d20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #2: ffffffff8e28d9d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf1/0xb60 net/core/net_namespace.c:566

stack backtrace:
CPU: 1 PID: 46 Comm: kworker/u4:3 Not tainted 6.1.95-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 lockdep_rcu_suspicious+0x21c/0x330 kernel/locking/lockdep.c:6592
 _destroy_all_sets+0x533/0x5e0 net/netfilter/ipset/ip_set_core.c:1213
 ip_set_net_exit+0x1c/0x50 net/netfilter/ipset/ip_set_core.c:2398
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x6ce/0xb60 net/core/net_namespace.c:604
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308