program: bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b7040000f6000000850000004300000095"], 0x0, 0x0, 0x53, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x14, 0x0, 0x0, 0x0}, 0x94) r0 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=ANY=[@ANYBLOB="1b000000000000000000"], 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000010c0)={0x1a, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0], 0x0, 0x0, 0x0, 0x0, 0x0, 0x61c1fb49a98f4c93, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r1 = bpf$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) [ 85.335781][ T5322] Bluetooth: hci0: command tx timeout [ 85.451861][ T5347] [ 85.453047][ T5347] ============================= [ 85.454942][ T5347] WARNING: suspicious RCU usage [ 85.457046][ T5347] syzkaller #0 Not tainted [ 85.458845][ T5347] ----------------------------- [ 85.460765][ T5347] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 85.464251][ T5347] [ 85.464251][ T5347] other info that might help us debug this: [ 85.464251][ T5347] [ 85.469519][ T5347] [ 85.469519][ T5347] rcu_scheduler_active = 2, debug_locks = 1 [ 85.473258][ T5347] 1 lock held by syz.0.0/5347: [ 85.475615][ T5347] #0: ffffffff8df41c80 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 85.480250][ T5347] [ 85.480250][ T5347] stack backtrace: [ 85.482719][ T5347] CPU: 0 UID: 0 PID: 5347 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 85.482737][ T5347] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 85.482745][ T5347] Call Trace: [ 85.482752][ T5347] [ 85.482759][ T5347] dump_stack_lvl+0xe8/0x150 [ 85.482780][ T5347] lockdep_rcu_suspicious+0x140/0x1d0 [ 85.482797][ T5347] get_callchain_entry+0x2b6/0x3c0 [ 85.482856][ T5347] get_perf_callchain+0xb3/0x820 [ 85.482872][ T5347] ? __pfx_get_perf_callchain+0x10/0x10 [ 85.482885][ T5347] ? futex_unqueue+0x22/0x240 [ 85.482895][ T5347] ? futex_unqueue+0x22/0x240 [ 85.482903][ T5347] ? futex_unqueue+0x22/0x240 [ 85.482917][ T5347] __bpf_get_stack+0x45b/0xaa0 [ 85.482940][ T5347] ? __pfx___bpf_get_stack+0x10/0x10 [ 85.482959][ T5347] ? __lock_acquire+0x6b6/0x2cf0 [ 85.482969][ T5347] bpf_get_stack+0x33/0x50 [ 85.482979][ T5347] ? bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 85.482989][ T5347] bpf_get_stack_raw_tp+0x1a9/0x220 [ 85.483005][ T5347] bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 85.483015][ T5347] bpf_prog_run_pin_on_cpu+0x143/0x480 [ 85.483034][ T5347] bpf_prog_test_run_syscall+0x312/0x4b0 [ 85.483050][ T5347] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 85.483062][ T5347] ? __fget_files+0x2a/0x420 [ 85.483075][ T5347] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 85.483087][ T5347] bpf_prog_test_run+0x2c7/0x340 [ 85.483105][ T5347] __sys_bpf+0x562/0x860 [ 85.483120][ T5347] ? __pfx___sys_bpf+0x10/0x10 [ 85.483144][ T5347] ? rcu_is_watching+0x15/0xb0 [ 85.483154][ T5347] __x64_sys_bpf+0x7c/0x90 [ 85.483163][ T5347] do_syscall_64+0xec/0xf80 [ 85.483201][ T5347] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.483208][ T5347] ? trace_irq_disable+0x37/0x100 [ 85.483219][ T5347] ? clear_bhb_loop+0x60/0xb0 [ 85.483228][ T5347] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.483235][ T5347] RIP: 0033:0x7f298dd8f7c9 [ 85.483243][ T5347] 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 [ 85.483251][ T5347] RSP: 002b:00007f298ebd8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 85.483260][ T5347] RAX: ffffffffffffffda RBX: 00007f298dfe5fa0 RCX: 00007f298dd8f7c9 [ 85.483266][ T5347] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a [ 85.483271][ T5347] RBP: 00007f298de13f91 R08: 0000000000000000 R09: 0000000000000000 [ 85.483275][ T5347] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 85.483280][ T5347] R13: 00007f298dfe6038 R14: 00007f298dfe5fa0 R15: 00007ffc71676578 [ 85.483297][ T5347]