============================= WARNING: suspicious RCU usage 6.9.0-rc6-syzkaller-00131-gf03359bca01b #0 Not tainted ----------------------------- kernel/events/callchain.c:161 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-executor.2/15442: #0: ffffffff8d7b04c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8d7b04c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace include/linux/rcupdate_trace.h:57 [inline] #0: ffffffff8d7b04c0 (rcu_read_lock_trace){....}-{0:0}, at: bpf_prog_test_run_syscall+0x345/0x770 net/bpf/test_run.c:1508 stack backtrace: CPU: 1 PID: 15442 Comm: syz-executor.2 Not tainted 6.9.0-rc6-syzkaller-00131-gf03359bca01b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __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 get_callchain_entry+0x274/0x3f0 kernel/events/callchain.c:161 get_perf_callchain+0xdc/0x5a0 kernel/events/callchain.c:187 __bpf_get_stack+0x4d9/0x700 kernel/bpf/stackmap.c:435 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1985 [inline] bpf_get_stack_raw_tp+0x124/0x160 kernel/trace/bpf_trace.c:1975 ___bpf_prog_run+0x3e51/0xabd0 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:650 [inline] bpf_prog_run include/linux/filter.h:664 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:681 [inline] bpf_prog_test_run_syscall+0x5b7/0x770 net/bpf/test_run.c:1509 bpf_prog_test_run kernel/bpf/syscall.c:4269 [inline] __sys_bpf+0xd56/0x4b40 kernel/bpf/syscall.c:5678 __do_sys_bpf kernel/bpf/syscall.c:5767 [inline] __se_sys_bpf kernel/bpf/syscall.c:5765 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5765 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f390de7dd29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f390ebe10c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f390dfabf80 RCX: 00007f390de7dd29 RDX: 000000000000000c RSI: 00000000200004c0 RDI: 000000000000000a RBP: 00007f390deca47e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f390dfabf80 R15: 00007ffdb2c7f8a8