program: r0 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x10, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b7040000f6000000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 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) [ 76.150707][ T4704] Bluetooth: hci0: command tx timeout [ 76.197359][ T5356] [ 76.199011][ T5356] ============================= [ 76.207308][ T5356] WARNING: suspicious RCU usage [ 76.210922][ T5356] syzkaller #0 Not tainted [ 76.213270][ T5356] ----------------------------- [ 76.215121][ T5356] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 76.218800][ T5356] [ 76.218800][ T5356] other info that might help us debug this: [ 76.218800][ T5356] [ 76.223704][ T5356] [ 76.223704][ T5356] rcu_scheduler_active = 2, debug_locks = 1 [ 76.227311][ T5356] 1 lock held by syz.0.0/5356: [ 76.229445][ T5356] #0: ffffffff8e33a2c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 76.234296][ T5356] [ 76.234296][ T5356] stack backtrace: [ 76.236889][ T5356] CPU: 0 UID: 0 PID: 5356 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 76.236906][ T5356] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 76.236911][ T5356] Call Trace: [ 76.236916][ T5356] [ 76.236920][ T5356] dump_stack_lvl+0x189/0x250 [ 76.236940][ T5356] ? __pfx_dump_stack_lvl+0x10/0x10 [ 76.236952][ T5356] ? __pfx__printk+0x10/0x10 [ 76.236975][ T5356] lockdep_rcu_suspicious+0x140/0x1d0 [ 76.237024][ T5356] get_callchain_entry+0x2b6/0x3c0 [ 76.237041][ T5356] get_perf_callchain+0xa1/0x6b0 [ 76.237060][ T5356] ? __pfx_get_perf_callchain+0x10/0x10 [ 76.237074][ T5356] ? futex_unqueue+0x22/0x240 [ 76.237096][ T5356] ? futex_unqueue+0x211/0x240 [ 76.237107][ T5356] ? __futex_wait+0x1d1/0x3e0 [ 76.237123][ T5356] ? __futex_wait+0x34f/0x3e0 [ 76.237139][ T5356] __bpf_get_stack+0x3fc/0xa60 [ 76.237160][ T5356] ? __pfx___bpf_get_stack+0x10/0x10 [ 76.237172][ T5356] ? __lock_acquire+0xab9/0xd20 [ 76.237192][ T5356] bpf_get_stack+0x33/0x50 [ 76.237202][ T5356] ? bpf_prog_d43750871481577d+0x46/0x4e [ 76.237212][ T5356] bpf_get_stack_raw_tp+0x1a9/0x220 [ 76.237227][ T5356] bpf_prog_d43750871481577d+0x46/0x4e [ 76.237237][ T5356] bpf_prog_run_pin_on_cpu+0x6a/0x150 [ 76.237251][ T5356] bpf_prog_test_run_syscall+0x312/0x4b0 [ 76.237264][ T5356] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 76.237275][ T5356] ? __fget_files+0x2a/0x420 [ 76.237295][ T5356] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 76.237308][ T5356] bpf_prog_test_run+0x2c7/0x340 [ 76.237324][ T5356] __sys_bpf+0x581/0x870 [ 76.237334][ T5356] ? __pfx___sys_bpf+0x10/0x10 [ 76.237346][ T5356] ? rcu_is_watching+0x15/0xb0 [ 76.237365][ T5356] ? rcu_is_watching+0x15/0xb0 [ 76.237378][ T5356] __x64_sys_bpf+0x7c/0x90 [ 76.237392][ T5356] do_syscall_64+0xfa/0x3b0 [ 76.237441][ T5356] ? lockdep_hardirqs_on+0x9c/0x150 [ 76.237458][ T5356] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.237468][ T5356] ? clear_bhb_loop+0x60/0xb0 [ 76.237481][ T5356] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.237491][ T5356] RIP: 0033:0x7f0b5c78eba9 [ 76.237504][ T5356] 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 [ 76.237512][ T5356] RSP: 002b:00007f0b5d57c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 76.237524][ T5356] RAX: ffffffffffffffda RBX: 00007f0b5c9d5fa0 RCX: 00007f0b5c78eba9 [ 76.237534][ T5356] RDX: 0000000000000010 RSI: 0000200000000740 RDI: 000000000000000a [ 76.237540][ T5356] RBP: 00007f0b5c811e19 R08: 0000000000000000 R09: 0000000000000000 [ 76.237546][ T5356] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 76.237552][ T5356] R13: 00007f0b5c9d6038 R14: 00007f0b5c9d5fa0 R15: 00007ffc88eb1b78 [ 76.237567][ T5356]