program: bpf$ENABLE_STATS(0x20, 0x0, 0x0) r0 = bpf$MAP_CREATE(0x0, &(0x7f00000009c0)=ANY=[@ANYBLOB="1b00000000000000000000000080"], 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b704000002010000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback=0xe, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r1 = bpf$PROG_LOAD(0x5, &(0x7f0000000180)={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}, 0x94) bpf$BPF_GET_PROG_INFO(0xa, &(0x7f0000000740)={r1, 0x0, 0x0}, 0x10) [ 68.136325][ T4668] Bluetooth: hci0: command tx timeout [ 68.172247][ T5320] [ 68.174340][ T5320] ============================= [ 68.181872][ T5320] WARNING: suspicious RCU usage [ 68.185313][ T5320] syzkaller #0 Not tainted [ 68.187940][ T5320] ----------------------------- [ 68.190248][ T5320] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 68.194048][ T5320] [ 68.194048][ T5320] other info that might help us debug this: [ 68.194048][ T5320] [ 68.198471][ T5320] [ 68.198471][ T5320] rcu_scheduler_active = 2, debug_locks = 1 [ 68.203368][ T5320] 1 lock held by syz.0.0/5320: [ 68.206605][ T5320] #0: ffffffff8df3d4c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 68.211989][ T5320] [ 68.211989][ T5320] stack backtrace: [ 68.214625][ T5320] CPU: 0 UID: 0 PID: 5320 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 68.214643][ T5320] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 68.214650][ T5320] Call Trace: [ 68.214659][ T5320] [ 68.214666][ T5320] dump_stack_lvl+0x189/0x250 [ 68.214689][ T5320] ? __pfx_dump_stack_lvl+0x10/0x10 [ 68.214703][ T5320] ? __pfx__printk+0x10/0x10 [ 68.214721][ T5320] lockdep_rcu_suspicious+0x140/0x1d0 [ 68.214737][ T5320] get_callchain_entry+0x2b6/0x3c0 [ 68.214753][ T5320] get_perf_callchain+0xb3/0x6f0 [ 68.214765][ T5320] ? __pfx___schedule+0x10/0x10 [ 68.214780][ T5320] ? __pfx_get_perf_callchain+0x10/0x10 [ 68.214802][ T5320] __bpf_get_stack+0x3fa/0xa60 [ 68.214818][ T5320] ? __pfx___bpf_get_stack+0x10/0x10 [ 68.214834][ T5320] bpf_get_stack+0x33/0x50 [ 68.214848][ T5320] ? bpf_prog_e8e6327ccf46c9a7+0x46/0x4e [ 68.214859][ T5320] bpf_get_stack_raw_tp+0x1a9/0x220 [ 68.214878][ T5320] bpf_prog_e8e6327ccf46c9a7+0x46/0x4e [ 68.214888][ T5320] bpf_prog_run_pin_on_cpu+0x3b9/0x470 [ 68.214909][ T5320] bpf_prog_test_run_syscall+0x312/0x4b0 [ 68.214928][ T5320] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 68.214943][ T5320] ? __fget_files+0x2a/0x420 [ 68.214960][ T5320] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 68.214975][ T5320] bpf_prog_test_run+0x2c7/0x340 [ 68.214989][ T5320] __sys_bpf+0x562/0x860 [ 68.215000][ T5320] ? __pfx___sys_bpf+0x10/0x10 [ 68.215009][ T5320] ? rcu_is_watching+0x15/0xb0 [ 68.215031][ T5320] ? rcu_is_watching+0x15/0xb0 [ 68.215048][ T5320] __x64_sys_bpf+0x7c/0x90 [ 68.215063][ T5320] do_syscall_64+0xfa/0xfa0 [ 68.215077][ T5320] ? lockdep_hardirqs_on+0x9c/0x150 [ 68.215089][ T5320] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 68.215099][ T5320] ? clear_bhb_loop+0x60/0xb0 [ 68.215112][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 68.215123][ T5320] RIP: 0033:0x7fda4f38efc9 [ 68.215135][ T5320] 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 [ 68.215143][ T5320] RSP: 002b:00007fda502f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 68.215156][ T5320] RAX: ffffffffffffffda RBX: 00007fda4f5e5fa0 RCX: 00007fda4f38efc9 [ 68.215164][ T5320] RDX: 0000000000000010 RSI: 0000200000000740 RDI: 000000000000000a [ 68.215171][ T5320] RBP: 00007fda4f411f91 R08: 0000000000000000 R09: 0000000000000000 [ 68.215178][ T5320] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 68.215185][ T5320] R13: 00007fda4f5e6038 R14: 00007fda4f5e5fa0 R15: 00007ffdf8c3d288 [ 68.215202][ T5320]