=============================
WARNING: suspicious RCU usage
syzkaller #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.4.1444/10845:
 #0: ffffffff887f51d8 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: bpf_prog_test_run_syscall+0x2c6/0xe74 net/bpf/test_run.c:1635

stack backtrace:
CPU: 1 UID: 0 PID: 10845 Comm: syz.4.1444 Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8007b2a2>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:149
[<ffffffff80003384>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:155
[<ffffffff800601cc>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff800601cc>] dump_stack_lvl+0x114/0x1ac lib/dump_stack.c:120
[<ffffffff80060280>] dump_stack+0x1c/0x28 lib/dump_stack.c:129
[<ffffffff802e845a>] lockdep_rcu_suspicious+0x19e/0x268 kernel/locking/lockdep.c:6876
[<ffffffff80867a78>] get_callchain_entry+0x370/0x3f8 kernel/events/callchain.c:163
[<ffffffff80867f5c>] get_perf_callchain+0x390/0x904 kernel/events/callchain.c:231
[<ffffffff807cf600>] __bpf_get_stack+0x538/0xa88 kernel/bpf/stackmap.c:472
[<ffffffff807cfb84>] ____bpf_get_stack kernel/bpf/stackmap.c:517 [inline]
[<ffffffff807cfb84>] bpf_get_stack+0x34/0x44 kernel/bpf/stackmap.c:514
[<ffffffff805b766e>] ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1661 [inline]
[<ffffffff805b766e>] bpf_get_stack_raw_tp+0xc2/0x114 kernel/trace/bpf_trace.c:1651
[<ffffffff78003c24>] bpf_prog_e8e6327ccf46c9a7+0x48/0x5a
[<ffffffff855c3f26>] bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline]
[<ffffffff855c3f26>] __bpf_prog_run include/linux/filter.h:723 [inline]
[<ffffffff855c3f26>] bpf_prog_run include/linux/filter.h:730 [inline]
[<ffffffff855c3f26>] bpf_prog_run_pin_on_cpu include/linux/filter.h:747 [inline]
[<ffffffff855c3f26>] bpf_prog_test_run_syscall+0x4fe/0xe74 net/bpf/test_run.c:1640
[<ffffffff8061e482>] bpf_prog_test_run kernel/bpf/syscall.c:4722 [inline]
[<ffffffff8061e482>] __sys_bpf+0x1292/0x54dc kernel/bpf/syscall.c:6246
[<ffffffff80623540>] __do_sys_bpf kernel/bpf/syscall.c:6341 [inline]
[<ffffffff80623540>] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline]
[<ffffffff80623540>] __riscv_sys_bpf+0x70/0xd0 kernel/bpf/syscall.c:6339
[<ffffffff80077f1e>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
[<ffffffff8642fdbe>] do_trap_ecall_u+0x402/0x680 arch/riscv/kernel/traps.c:342
[<ffffffff8645a152>] handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232