program: bpf$PROG_LOAD_XDP(0x5, 0x0, 0x0) bpf$MAP_CREATE(0x0, 0x0, 0x50) r0 = bpf$MAP_CREATE(0x0, &(0x7f0000001440)=ANY=[@ANYBLOB="1b00000000000000000000000080"], 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0xd, 0x6, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b7040000f6000000850000004300000095"], 0x0, 0xfffffffc, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @sock_ops=0x3, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x800}, 0x94) r1 = bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x1f, 0xc, &(0x7f0000000440)=ANY=[], &(0x7f0000000240)='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x1a, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x90) bpf$PROG_BIND_MAP(0xa, &(0x7f00000004c0)={r1}, 0xc) [ 86.625259][ T5279] Bluetooth: hci0: command tx timeout [ 86.753971][ T5318] [ 86.755492][ T5318] ============================= [ 86.757640][ T5318] WARNING: suspicious RCU usage [ 86.759806][ T5318] syzkaller #0 Not tainted [ 86.761910][ T5318] ----------------------------- [ 86.764143][ T5318] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 86.767905][ T5318] [ 86.767905][ T5318] other info that might help us debug this: [ 86.767905][ T5318] [ 86.772424][ T5318] [ 86.772424][ T5318] rcu_scheduler_active = 2, debug_locks = 1 [ 86.776084][ T5318] locks held by syz.0.0/5318: 1, last CPU#0: [ 86.778802][ T5318] #0: ffffffff8ed5cad8 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_read_lock_trace+0x25/0x110 [ 86.783691][ T5318] [ 86.783691][ T5318] stack backtrace: [ 86.786332][ T5318] CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 86.790298][ T5318] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 86.794784][ T5318] Call Trace: [ 86.796346][ T5318] [ 86.797659][ T5318] dump_stack_lvl+0xe8/0x150 [ 86.799703][ T5318] lockdep_rcu_suspicious+0x140/0x1d0 [ 86.802074][ T5318] get_callchain_entry+0x2b7/0x3c0 [ 86.804318][ T5318] get_perf_callchain+0xd5/0x880 [ 86.806455][ T5318] ? __pfx_get_perf_callchain+0x10/0x10 [ 86.808920][ T5318] ? __lock_acquire+0x747/0x2de0 [ 86.811168][ T5318] __bpf_get_stack+0x375/0xae0 [ 86.813297][ T5318] ? __pfx___bpf_get_stack+0x10/0x10 [ 86.815643][ T5318] ? __lock_acquire+0x747/0x2de0 [ 86.817808][ T5318] ? lock_acquire+0x115/0x350 [ 86.819912][ T5318] ? bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 86.822406][ T5318] bpf_get_stack_raw_tp+0x1a4/0x210 [ 86.824727][ T5318] bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 86.827060][ T5318] bpf_prog_run_pin_on_cpu+0x14f/0x4c0 [ 86.829400][ T5318] bpf_prog_test_run_syscall+0x324/0x4c0 [ 86.831910][ T5318] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 86.834579][ T5318] ? __fget_files+0x2a/0x420 [ 86.836557][ T5318] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 86.839168][ T5318] bpf_prog_test_run+0x2c5/0x340 [ 86.841248][ T5318] __sys_bpf+0xa22/0xda0 [ 86.843136][ T5318] ? __pfx___sys_bpf+0x10/0x10 [ 86.845228][ T5318] ? do_futex+0x458/0x4e0 [ 86.847442][ T5318] ? rcu_is_watching+0x16/0xb0 [ 86.849603][ T5318] __x64_sys_bpf+0xba/0xd0 [ 86.851571][ T5318] do_syscall_64+0x166/0x520 [ 86.853584][ T5318] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.856136][ T5318] ? clear_bhb_loop+0x70/0xc0 [ 86.858147][ T5318] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.860664][ T5318] RIP: 0033:0x7f0e8119e159 [ 86.862710][ T5318] 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 [ 86.870887][ T5318] RSP: 002b:00007f0e81fe0fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 86.874567][ T5318] RAX: ffffffffffffffda RBX: 00007f0e81425fa0 RCX: 00007f0e8119e159 [ 86.877974][ T5318] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a [ 86.881544][ T5318] RBP: 00007f0e8123506b R08: 0000000000000000 R09: 0000000000000000 [ 86.885081][ T5318] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 86.888496][ T5318] R13: 00007f0e81426038 R14: 00007f0e81425fa0 R15: 00007ffff0bafd88 [ 86.891908][ T5318]