program: perf_event_open(&(0x7f0000000200)={0x2, 0x80, 0xf2, 0x0, 0x0, 0x0, 0x0, 0x0, 0x404, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x4000, 0x0, @perf_config_ext, 0x0, 0x0, 0x3, 0x0, 0x0, 0xffffffff}, 0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0x0) r0 = bpf$MAP_CREATE(0x0, &(0x7f00000008c0)=ANY=[@ANYBLOB="1b00000000000000000000000080"], 0x48) bpf$PROG_LOAD(0x5, &(0x7f0000000540)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b704000002010000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback=0x17, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x65ed}, 0x94) r1 = bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x1f, 0xc, &(0x7f0000000440)=ANY=[], &(0x7f0000000240)='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x12, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x90) bpf$BPF_GET_PROG_INFO(0xa, &(0x7f0000000740)={r1, 0x0, 0x0}, 0x10) [ 104.240193][ T4652] Bluetooth: hci0: command tx timeout [ 104.388085][ T5327] [ 104.391001][ T5327] ============================= [ 104.394457][ T5327] WARNING: suspicious RCU usage [ 104.397560][ T5327] syzkaller #0 Not tainted [ 104.400222][ T5327] ----------------------------- [ 104.402843][ T5327] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 104.407320][ T5327] [ 104.407320][ T5327] other info that might help us debug this: [ 104.407320][ T5327] [ 104.412538][ T5327] [ 104.412538][ T5327] rcu_scheduler_active = 2, debug_locks = 1 [ 104.416579][ T5327] 1 lock held by syz.0.0/5327: [ 104.418754][ T5327] #0: ffffffff8e95cf58 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_read_lock_trace+0x25/0x110 [ 104.424137][ T5327] [ 104.424137][ T5327] stack backtrace: [ 104.426898][ T5327] CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 104.426925][ T5327] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 104.426935][ T5327] Call Trace: [ 104.426943][ T5327] [ 104.426951][ T5327] dump_stack_lvl+0xe8/0x150 [ 104.426971][ T5327] lockdep_rcu_suspicious+0x13f/0x1d0 [ 104.426986][ T5327] get_callchain_entry+0x2b6/0x3c0 [ 104.427001][ T5327] get_perf_callchain+0xd5/0x880 [ 104.427019][ T5327] ? __pfx_get_perf_callchain+0x10/0x10 [ 104.427028][ T5327] ? futex_unqueue+0x22/0x240 [ 104.427037][ T5327] ? futex_unqueue+0x22/0x240 [ 104.427043][ T5327] ? futex_unqueue+0x22/0x240 [ 104.427053][ T5327] __bpf_get_stack+0x445/0xab0 [ 104.427071][ T5327] ? __pfx___bpf_get_stack+0x10/0x10 [ 104.427083][ T5327] ? __lock_acquire+0x6b5/0x2cf0 [ 104.427095][ T5327] bpf_get_stack+0x33/0x50 [ 104.427105][ T5327] ? bpf_prog_e8e6327ccf46c9a7+0x46/0x4e [ 104.427115][ T5327] bpf_get_stack_raw_tp+0x1a9/0x220 [ 104.427136][ T5327] bpf_prog_e8e6327ccf46c9a7+0x46/0x4e [ 104.427147][ T5327] bpf_prog_run_pin_on_cpu+0x142/0x470 [ 104.427165][ T5327] bpf_prog_test_run_syscall+0x318/0x4c0 [ 104.427179][ T5327] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 104.427189][ T5327] ? __fget_files+0x2a/0x420 [ 104.427201][ T5327] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 104.427214][ T5327] bpf_prog_test_run+0x2c7/0x340 [ 104.427226][ T5327] __sys_bpf+0x643/0x950 [ 104.427242][ T5327] ? __pfx___sys_bpf+0x10/0x10 [ 104.427262][ T5327] ? rcu_is_watching+0x15/0xb0 [ 104.427312][ T5327] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 104.427324][ T5327] __x64_sys_bpf+0x7c/0x90 [ 104.427339][ T5327] do_syscall_64+0x15f/0xf80 [ 104.427355][ T5327] ? trace_irq_disable+0x3b/0x140 [ 104.427375][ T5327] ? clear_bhb_loop+0x40/0x90 [ 104.427393][ T5327] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 104.427405][ T5327] RIP: 0033:0x7f464339cdd9 [ 104.427421][ T5327] 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 [ 104.427428][ T5327] RSP: 002b:00007f46442fdfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 104.427439][ T5327] RAX: ffffffffffffffda RBX: 00007f4643615fa0 RCX: 00007f464339cdd9 [ 104.427444][ T5327] RDX: 0000000000000010 RSI: 0000200000000740 RDI: 000000000000000a [ 104.427449][ T5327] RBP: 00007f4643432d69 R08: 0000000000000000 R09: 0000000000000000 [ 104.427453][ T5327] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 104.427457][ T5327] R13: 00007f4643616038 R14: 00007f4643615fa0 R15: 00007ffcf9c914f8 [ 104.427469][ T5327]