program: bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b7040000f6000000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0xffffffffffffff58, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x55, 0x0, 0x0, 0x0}, 0x94) r0 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=ANY=[@ANYBLOB="1b000000000000000000"], 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r1 = bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x1f, 0xc, &(0x7f0000000440)=ANY=[], &(0x7f0000000240)='GPL\x00', 0x0, 0x0, 0x0, 0x0, 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) [ 77.993397][ T5298] Bluetooth: hci0: command tx timeout [ 78.092001][ T5318] [ 78.093171][ T5318] ============================= [ 78.095320][ T5318] WARNING: suspicious RCU usage [ 78.097376][ T5318] syzkaller #0 Not tainted [ 78.099336][ T5318] ----------------------------- [ 78.101551][ T5318] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 78.104983][ T5318] [ 78.104983][ T5318] other info that might help us debug this: [ 78.104983][ T5318] [ 78.109291][ T5318] [ 78.109291][ T5318] rcu_scheduler_active = 2, debug_locks = 1 [ 78.113089][ T5318] 1 lock held by syz.0.0/5318: [ 78.114977][ T5318] #0: ffffffff8e13d4c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 78.119540][ T5318] [ 78.119540][ T5318] stack backtrace: [ 78.122235][ T5318] CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 78.122251][ T5318] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 78.122258][ T5318] Call Trace: [ 78.122265][ T5318] [ 78.122270][ T5318] dump_stack_lvl+0x189/0x250 [ 78.122284][ T5318] ? __pfx_dump_stack_lvl+0x10/0x10 [ 78.122291][ T5318] ? __pfx__printk+0x10/0x10 [ 78.122304][ T5318] lockdep_rcu_suspicious+0x140/0x1d0 [ 78.122316][ T5318] get_callchain_entry+0x2b6/0x3c0 [ 78.122325][ T5318] get_perf_callchain+0xb3/0x6f0 [ 78.122337][ T5318] ? __pfx_get_perf_callchain+0x10/0x10 [ 78.122347][ T5318] ? futex_unqueue+0x22/0x240 [ 78.122359][ T5318] ? futex_unqueue+0x22/0x240 [ 78.122367][ T5318] ? futex_unqueue+0x22/0x240 [ 78.122379][ T5318] ? futex_unqueue+0x211/0x240 [ 78.122390][ T5318] __bpf_get_stack+0x3fa/0xa60 [ 78.122406][ T5318] ? __pfx___bpf_get_stack+0x10/0x10 [ 78.122426][ T5318] bpf_get_stack+0x33/0x50 [ 78.122437][ T5318] ? bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 78.122447][ T5318] bpf_get_stack_raw_tp+0x1a9/0x220 [ 78.122463][ T5318] bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 78.122473][ T5318] bpf_prog_run_pin_on_cpu+0x143/0x470 [ 78.122493][ T5318] bpf_prog_test_run_syscall+0x312/0x4b0 [ 78.122508][ T5318] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 78.122519][ T5318] ? __fget_files+0x2a/0x420 [ 78.122581][ T5318] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 78.122601][ T5318] bpf_prog_test_run+0x2c7/0x340 [ 78.122619][ T5318] __sys_bpf+0x562/0x860 [ 78.122633][ T5318] ? __pfx___sys_bpf+0x10/0x10 [ 78.122649][ T5318] ? rcu_is_watching+0x15/0xb0 [ 78.122680][ T5318] ? rcu_is_watching+0x15/0xb0 [ 78.122705][ T5318] __x64_sys_bpf+0x7c/0x90 [ 78.122717][ T5318] do_syscall_64+0xfa/0xfa0 [ 78.122765][ T5318] ? lockdep_hardirqs_on+0x9c/0x150 [ 78.122781][ T5318] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 78.122793][ T5318] ? clear_bhb_loop+0x60/0xb0 [ 78.122807][ T5318] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 78.122819][ T5318] RIP: 0033:0x7f195c18eec9 [ 78.122830][ T5318] 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 [ 78.122839][ T5318] RSP: 002b:00007f195d052038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 78.122847][ T5318] RAX: ffffffffffffffda RBX: 00007f195c3e5fa0 RCX: 00007f195c18eec9 [ 78.122853][ T5318] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a [ 78.122859][ T5318] RBP: 00007f195c211f91 R08: 0000000000000000 R09: 0000000000000000 [ 78.122866][ T5318] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 78.122872][ T5318] R13: 00007f195c3e6038 R14: 00007f195c3e5fa0 R15: 00007fffad94c1e8 [ 78.122889][ T5318]