program: bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000002000000b704000000000000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0}, 0x90) r0 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=ANY=[@ANYBLOB="1b000000000000000000"], 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r1 = bpf$PROG_LOAD(0x5, &(0x7f0000000cc0)={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}, 0x94) bpf$PROG_BIND_MAP(0xa, &(0x7f00000004c0)={r1}, 0xc) [ 85.117610][ T5303] Bluetooth: hci0: command tx timeout [ 85.200124][ T5327] [ 85.201265][ T5327] ============================= [ 85.203408][ T5327] WARNING: suspicious RCU usage [ 85.205565][ T5327] syzkaller #0 Not tainted [ 85.208018][ T5327] ----------------------------- [ 85.210121][ T5327] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 85.213733][ T5327] [ 85.213733][ T5327] other info that might help us debug this: [ 85.213733][ T5327] [ 85.218702][ T5327] [ 85.218702][ T5327] rcu_scheduler_active = 2, debug_locks = 1 [ 85.222230][ T5327] 1 lock held by syz.0.0/5327: [ 85.224318][ T5327] #0: ffffffff8df3d880 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 85.228972][ T5327] [ 85.228972][ T5327] stack backtrace: [ 85.231437][ T5327] CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 85.231453][ T5327] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 85.231461][ T5327] Call Trace: [ 85.231467][ T5327] [ 85.231473][ T5327] dump_stack_lvl+0x189/0x250 [ 85.231496][ T5327] ? __pfx_dump_stack_lvl+0x10/0x10 [ 85.231512][ T5327] ? __pfx__printk+0x10/0x10 [ 85.231533][ T5327] lockdep_rcu_suspicious+0x140/0x1d0 [ 85.231549][ T5327] get_callchain_entry+0x2b6/0x3c0 [ 85.231566][ T5327] get_perf_callchain+0xb3/0x6f0 [ 85.231584][ T5327] ? __pfx_get_perf_callchain+0x10/0x10 [ 85.231598][ T5327] ? futex_unqueue+0x22/0x240 [ 85.231611][ T5327] ? futex_unqueue+0x22/0x240 [ 85.231623][ T5327] ? futex_unqueue+0x22/0x240 [ 85.231636][ T5327] ? futex_unqueue+0x211/0x240 [ 85.231653][ T5327] __bpf_get_stack+0x3fa/0xa60 [ 85.231669][ T5327] ? __pfx___bpf_get_stack+0x10/0x10 [ 85.231687][ T5327] bpf_get_stack+0x33/0x50 [ 85.231700][ T5327] ? bpf_prog_954a33db00d453db+0x43/0x4b [ 85.231708][ T5327] bpf_get_stack_raw_tp+0x1a9/0x220 [ 85.231721][ T5327] bpf_prog_954a33db00d453db+0x43/0x4b [ 85.231728][ T5327] bpf_prog_run_pin_on_cpu+0x143/0x470 [ 85.231744][ T5327] bpf_prog_test_run_syscall+0x312/0x4b0 [ 85.231760][ T5327] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 85.231775][ T5327] ? __fget_files+0x2a/0x420 [ 85.231794][ T5327] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 85.231811][ T5327] bpf_prog_test_run+0x2c7/0x340 [ 85.231826][ T5327] __sys_bpf+0x562/0x860 [ 85.231840][ T5327] ? __pfx___sys_bpf+0x10/0x10 [ 85.231849][ T5327] ? rcu_is_watching+0x15/0xb0 [ 85.231873][ T5327] ? rcu_is_watching+0x15/0xb0 [ 85.231891][ T5327] __x64_sys_bpf+0x7c/0x90 [ 85.231907][ T5327] do_syscall_64+0xfa/0xfa0 [ 85.231929][ T5327] ? lockdep_hardirqs_on+0x9c/0x150 [ 85.231944][ T5327] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.231956][ T5327] ? clear_bhb_loop+0x60/0xb0 [ 85.231971][ T5327] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.231983][ T5327] RIP: 0033:0x7f64bbf8f6c9 [ 85.231995][ T5327] 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 [ 85.232004][ T5327] RSP: 002b:00007f64bcd63038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 85.232017][ T5327] RAX: ffffffffffffffda RBX: 00007f64bc1e5fa0 RCX: 00007f64bbf8f6c9 [ 85.232025][ T5327] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a [ 85.232032][ T5327] RBP: 00007f64bc011f91 R08: 0000000000000000 R09: 0000000000000000 [ 85.232039][ T5327] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 85.232046][ T5327] R13: 00007f64bc1e6038 R14: 00007f64bc1e5fa0 R15: 00007ffedafcdd88 [ 85.232066][ T5327]