=============================
WARNING: suspicious RCU usage
6.10.0-rc4-syzkaller-00045-g92e5605a199e #0 Not tainted
-----------------------------
net/netfilter/ipset/ip_set_core.c:1200 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/u32:8/1113:
 #0: ffff8880162e7148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x11f0/0x1ad0 kernel/workqueue.c:3206
 #1: ffffc9000737fd80 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1ad0 kernel/workqueue.c:3207
 #2: ffffffff8f7230d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xbb/0xbf0 net/core/net_namespace.c:594

stack backtrace:
CPU: 1 PID: 1113 Comm: kworker/u32:8 Not tainted 6.10.0-rc4-syzkaller-00045-g92e5605a199e #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:114
 lockdep_rcu_suspicious+0x20b/0x3b0 kernel/locking/lockdep.c:6712
 _destroy_all_sets+0x261/0x6d0 net/netfilter/ipset/ip_set_core.c:1200
 ip_set_net_exit+0x26/0x60 net/netfilter/ipset/ip_set_core.c:2396
 ops_exit_list+0xb0/0x180 net/core/net_namespace.c:173
 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640
 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

=============================
WARNING: suspicious RCU usage
6.10.0-rc4-syzkaller-00045-g92e5605a199e #0 Not tainted
-----------------------------
net/netfilter/ipset/ip_set_core.c:1211 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/u32:8/1113:
 #0: ffff8880162e7148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x11f0/0x1ad0 kernel/workqueue.c:3206
 #1: ffffc9000737fd80 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1ad0 kernel/workqueue.c:3207
 #2: ffffffff8f7230d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xbb/0xbf0 net/core/net_namespace.c:594

stack backtrace:
CPU: 1 PID: 1113 Comm: kworker/u32:8 Not tainted 6.10.0-rc4-syzkaller-00045-g92e5605a199e #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:114
 lockdep_rcu_suspicious+0x20b/0x3b0 kernel/locking/lockdep.c:6712
 _destroy_all_sets+0x4e6/0x6d0 net/netfilter/ipset/ip_set_core.c:1211
 ip_set_net_exit+0x26/0x60 net/netfilter/ipset/ip_set_core.c:2396
 ops_exit_list+0xb0/0x180 net/core/net_namespace.c:173
 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640
 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>