=============================
WARNING: suspicious RCU usage
6.16.0-rc6-syzkaller-00128-g81e0db8e8398 #0 Not tainted
-----------------------------
net/core/netclassid_cgroup.c:24 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz.1.2320/11351:
 #0: ffffffff8e13f2c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80

stack backtrace:
CPU: 0 UID: 0 PID: 11351 Comm: syz.1.2320 Not tainted 6.16.0-rc6-syzkaller-00128-g81e0db8e8398 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 lockdep_rcu_suspicious+0x140/0x1d0
 task_cls_state+0x1a5/0x1d0
 bpf_get_cgroup_classid_curr+0x18/0x60
 bpf_prog_841aec7193f618b3+0x1b/0x21
 bpf_prog_run_pin_on_cpu+0x6a/0x150
 bpf_prog_test_run_syscall+0x312/0x4b0
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x4a4/0x860
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff56a38e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff56b1e9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ff56a5b5fa0 RCX: 00007ff56a38e9a9
RDX: 0000000000000039 RSI: 0000200000000500 RDI: 000000000000000a
RBP: 00007ff56a410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff56a5b5fa0 R15: 00007ffeacf96418
 </TASK>
