=============================
WARNING: suspicious RCU usage
6.16.0-rc1-syzkaller-gfda589c28604 #0 Not tainted
-----------------------------
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.0.519/6111:
 #0: ffffffff883dcae0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace include/linux/rcupdate_trace.h:53 [inline]
 #0: ffffffff883dcae0 (rcu_read_lock_trace){....}-{0:0}, at: bpf_prog_test_run_syscall+0x2fe/0x778 net/bpf/test_run.c:1563

stack backtrace:
CPU: 1 UID: 0 PID: 6111 Comm: syz.0.519 Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80078bbe>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132
[<ffffffff8000327a>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138
[<ffffffff8006103e>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8006103e>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff800610d2>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff802cd930>] lockdep_rcu_suspicious+0x196/0x268 kernel/locking/lockdep.c:6871
[<ffffffff807fa51a>] get_callchain_entry+0x2da/0x448 kernel/events/callchain.c:163
[<ffffffff807fa81e>] get_perf_callchain+0xc2/0x6c0 kernel/events/callchain.c:227
[<ffffffff80767082>] __bpf_get_stack+0x492/0xa24 kernel/bpf/stackmap.c:454
[<ffffffff80767648>] ____bpf_get_stack kernel/bpf/stackmap.c:499 [inline]
[<ffffffff80767648>] bpf_get_stack+0x34/0x44 kernel/bpf/stackmap.c:496
[<ffffffff805844b4>] ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1836 [inline]
[<ffffffff805844b4>] bpf_get_stack_raw_tp+0xde/0x112 kernel/trace/bpf_trace.c:1826
[<ffffffff7800732a>] bpf_prog_2ae546726a474a42+0x42/0x54
[<ffffffff854e9b04>] bpf_dispatcher_nop_func include/linux/bpf.h:1322 [inline]
[<ffffffff854e9b04>] __bpf_prog_run include/linux/filter.h:709 [inline]
[<ffffffff854e9b04>] bpf_prog_run include/linux/filter.h:725 [inline]
[<ffffffff854e9b04>] bpf_prog_run_pin_on_cpu include/linux/filter.h:742 [inline]
[<ffffffff854e9b04>] bpf_prog_test_run_syscall+0x592/0x778 net/bpf/test_run.c:1564
[<ffffffff805e0e98>] bpf_prog_test_run kernel/bpf/syscall.c:4429 [inline]
[<ffffffff805e0e98>] __sys_bpf+0xd4e/0x417c kernel/bpf/syscall.c:5854
[<ffffffff805e502a>] __do_sys_bpf kernel/bpf/syscall.c:5943 [inline]
[<ffffffff805e502a>] __se_sys_bpf kernel/bpf/syscall.c:5941 [inline]
[<ffffffff805e502a>] __riscv_sys_bpf+0x6c/0xc6 kernel/bpf/syscall.c:5941
[<ffffffff800769ae>] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112
[<ffffffff86324f02>] do_trap_ecall_u+0x396/0x530 arch/riscv/kernel/traps.c:341
[<ffffffff8634d39a>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197