=============================
WARNING: suspicious RCU usage
syzkaller #0 Tainted: G             L     
-----------------------------
kernel/events/callchain.c:163 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.1.10050/8459:
 #0: ffffffff8e95cf98 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_read_lock_trace+0x25/0x110

stack backtrace:
CPU: 1 UID: 0 PID: 8459 Comm: syz.1.10050 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xe8/0x150
 lockdep_rcu_suspicious+0x13f/0x1d0
 get_callchain_entry+0x2b6/0x3c0
 get_perf_callchain+0xd5/0x880
 __bpf_get_stack+0x445/0xab0
 bpf_get_stack+0x33/0x50
 bpf_get_stack_raw_tp+0x1a9/0x220
 bpf_prog_e8e6327ccf46c9a7+0x46/0x4e
 bpf_prog_run_pin_on_cpu+0x142/0x470
 bpf_prog_test_run_syscall+0x318/0x4c0
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x643/0x950
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa77279cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa77370e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa772a15fa0 RCX: 00007fa77279cdd9
RDX: 0000000000000010 RSI: 0000200000000280 RDI: 000000000000000a
RBP: 00007fa772832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa772a16038 R14: 00007fa772a15fa0 R15: 00007fff3a1cc378
 </TASK>
