program: r0 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000, 0x0, 0xffffffffffffffff, 0x0, '\x00', 0x0, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, @void, @value, @void, @value}, 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b704000002010000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, @void, @value}, 0x94) r1 = bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x1f, 0xc, &(0x7f0000000440)=ANY=[], &(0x7f0000000240)='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x1a, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @void, @value}, 0x90) bpf$PROG_BIND_MAP(0xa, &(0x7f00000004c0)={r1}, 0xc) [ 58.194786][ T5311] [ 58.195862][ T5311] ============================= [ 58.197723][ T5311] WARNING: suspicious RCU usage [ 58.199568][ T5311] 6.13.0-rc1-syzkaller-00001-ge70140ba0d2b #0 Not tainted [ 58.204341][ T5311] ----------------------------- [ 58.207328][ T5311] kernel/events/callchain.c:162 suspicious rcu_dereference_check() usage! [ 58.215414][ T5311] [ 58.215414][ T5311] other info that might help us debug this: [ 58.215414][ T5311] [ 58.219081][ T5311] [ 58.219081][ T5311] rcu_scheduler_active = 2, debug_locks = 1 [ 58.221983][ T5311] 1 lock held by syz.0.0/5311: [ 58.224188][ T5311] #0: ffffffff8e937f60 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 58.227847][ T5311] [ 58.227847][ T5311] stack backtrace: [ 58.230084][ T5311] CPU: 0 UID: 0 PID: 5311 Comm: syz.0.0 Not tainted 6.13.0-rc1-syzkaller-00001-ge70140ba0d2b #0 [ 58.233905][ T5311] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 58.237972][ T5311] Call Trace: [ 58.239385][ T5311] [ 58.240558][ T5311] dump_stack_lvl+0x241/0x360 [ 58.242503][ T5311] ? __pfx_dump_stack_lvl+0x10/0x10 [ 58.244446][ T5311] ? __pfx__printk+0x10/0x10 [ 58.246278][ T5311] lockdep_rcu_suspicious+0x226/0x340 [ 58.248337][ T5311] get_callchain_entry+0x2b2/0x3c0 [ 58.250362][ T5311] get_perf_callchain+0xec/0x970 [ 58.252491][ T5311] ? __pfx_get_perf_callchain+0x10/0x10 [ 58.254859][ T5311] ? __lock_acquire+0x1397/0x2100 [ 58.256888][ T5311] __bpf_get_stack+0x41f/0xad0 [ 58.258835][ T5311] ? __pfx___bpf_get_stack+0x10/0x10 [ 58.260893][ T5311] ? __pfx_lock_acquire+0x10/0x10 [ 58.262609][ T5311] bpf_get_stack+0x33/0x50 [ 58.264056][ T5311] bpf_get_stack_raw_tp+0x1a3/0x240 [ 58.265929][ T5311] bpf_prog_b8a90dd1efcc4ad9+0x46/0x4a [ 58.268478][ T5311] bpf_prog_run_pin_on_cpu+0x67/0x150 [ 58.270698][ T5311] bpf_prog_test_run_syscall+0x316/0x4e0 [ 58.272877][ T5311] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 58.275446][ T5311] ? __fget_files+0x2a/0x410 [ 58.277458][ T5311] ? fput+0x21b/0x290 [ 58.278711][ T5311] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 58.281011][ T5311] bpf_prog_test_run+0x2e4/0x360 [ 58.282918][ T5311] __sys_bpf+0x48d/0x810 [ 58.284527][ T5311] ? __pfx___sys_bpf+0x10/0x10 [ 58.286296][ T5311] ? __rseq_handle_notify_resume+0x34d/0x14e0 [ 58.288723][ T5311] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 58.291048][ T5311] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 58.293395][ T5311] ? do_syscall_64+0x100/0x230 [ 58.294879][ T5311] __x64_sys_bpf+0x7c/0x90 [ 58.296390][ T5311] do_syscall_64+0xf3/0x230 [ 58.298162][ T5311] ? clear_bhb_loop+0x35/0x90 [ 58.299972][ T5311] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 58.302164][ T5311] RIP: 0033:0x7f357717ff19 [ 58.303929][ T5311] 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 [ 58.311470][ T5311] RSP: 002b:00007f3577f36058 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 58.314788][ T5311] RAX: ffffffffffffffda RBX: 00007f3577345fa0 RCX: 00007f357717ff19 [ 58.317855][ T5311] RDX: 000000000000000c RSI: 00000000200004c0 RDI: 000000000000000a [ 58.320929][ T5311] RBP: 00007f35771f3986 R08: 0000000000000000 R09: 0000000000000000 [ 58.323638][ T5311] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 58.326379][ T5311] R13: 0000000000000000 R14: 00007f3577345fa0 R15: 00007ffc1f39d608 [ 58.329577][ T5311]