program: bpf$ENABLE_STATS(0x20, 0x0, 0x0) r0 = bpf$MAP_CREATE(0x0, &(0x7f00000008c0)=ANY=[@ANYBLOB="1b00000000000000000000000080"], 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b704000002010000850000004300000095"], 0x0, 0x200, 0x0, 0x0, 0x0, 0x2, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2}, 0x94) r1 = bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x1f, 0xc, &(0x7f0000000440)=ANY=[], &(0x7f0000000240)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 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) [ 74.841343][ T46] Bluetooth: hci0: command tx timeout [ 74.899290][ T5340] [ 74.900448][ T5340] ============================= [ 74.902417][ T5340] WARNING: suspicious RCU usage [ 74.904389][ T5340] syzkaller #0 Not tainted [ 74.906753][ T5340] ----------------------------- [ 74.908904][ T5340] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 74.912540][ T5340] [ 74.912540][ T5340] other info that might help us debug this: [ 74.912540][ T5340] [ 74.917107][ T5340] [ 74.917107][ T5340] rcu_scheduler_active = 2, debug_locks = 1 [ 74.920627][ T5340] 1 lock held by syz.0.0/5340: [ 74.922852][ T5340] #0: ffffffff8e141bc0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 74.927574][ T5340] [ 74.927574][ T5340] stack backtrace: [ 74.930197][ T5340] CPU: 0 UID: 0 PID: 5340 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 74.930214][ T5340] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 74.930223][ T5340] Call Trace: [ 74.930232][ T5340] [ 74.930239][ T5340] dump_stack_lvl+0x189/0x250 [ 74.930262][ T5340] ? __pfx_dump_stack_lvl+0x10/0x10 [ 74.930276][ T5340] ? __pfx__printk+0x10/0x10 [ 74.930302][ T5340] lockdep_rcu_suspicious+0x140/0x1d0 [ 74.930318][ T5340] get_callchain_entry+0x2b6/0x3c0 [ 74.930377][ T5340] get_perf_callchain+0xb3/0x820 [ 74.930394][ T5340] ? __pfx___schedule+0x10/0x10 [ 74.930439][ T5340] ? __pfx_get_perf_callchain+0x10/0x10 [ 74.930455][ T5340] ? __resched_curr+0x202/0x3e0 [ 74.930473][ T5340] __bpf_get_stack+0x45b/0xaa0 [ 74.930494][ T5340] ? __pfx___bpf_get_stack+0x10/0x10 [ 74.930517][ T5340] bpf_get_stack+0x33/0x50 [ 74.930532][ T5340] ? bpf_prog_e8e6327ccf46c9a7+0x46/0x4e [ 74.930543][ T5340] bpf_get_stack_raw_tp+0x1a9/0x220 [ 74.930560][ T5340] bpf_prog_e8e6327ccf46c9a7+0x46/0x4e [ 74.930570][ T5340] bpf_prog_run_pin_on_cpu+0x3b9/0x480 [ 74.930588][ T5340] bpf_prog_test_run_syscall+0x312/0x4b0 [ 74.930602][ T5340] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 74.930612][ T5340] ? __fget_files+0x2a/0x420 [ 74.930627][ T5340] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 74.930636][ T5340] bpf_prog_test_run+0x2c7/0x340 [ 74.930647][ T5340] __sys_bpf+0x562/0x860 [ 74.930657][ T5340] ? __pfx___sys_bpf+0x10/0x10 [ 74.930671][ T5340] ? rcu_is_watching+0x15/0xb0 [ 74.930682][ T5340] __x64_sys_bpf+0x7c/0x90 [ 74.930691][ T5340] do_syscall_64+0xfa/0xf80 [ 74.930705][ T5340] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 74.930723][ T5340] ? clear_bhb_loop+0x60/0xb0 [ 74.930736][ T5340] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 74.930747][ T5340] RIP: 0033:0x7f067578f7c9 [ 74.930760][ T5340] 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 [ 74.930770][ T5340] RSP: 002b:00007f067670b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 74.930785][ T5340] RAX: ffffffffffffffda RBX: 00007f06759e5fa0 RCX: 00007f067578f7c9 [ 74.930794][ T5340] RDX: 0000000000000010 RSI: 0000200000000740 RDI: 000000000000000a [ 74.930801][ T5340] RBP: 00007f0675813f91 R08: 0000000000000000 R09: 0000000000000000 [ 74.930808][ T5340] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 74.930814][ T5340] R13: 00007f06759e6038 R14: 00007f06759e5fa0 R15: 00007ffffcfb4968 [ 74.930829][ T5340]