program: bpf$PROG_LOAD(0x5, 0x0, 0x0) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x1b, 0xc, &(0x7f0000000440)=ANY=[], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback=0x9, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xe8c}, 0x94) ioctl$TUNSETIFF(0xffffffffffffffff, 0x400454ca, 0x0) r0 = bpf$MAP_CREATE(0x0, &(0x7f00000008c0)=ANY=[@ANYBLOB="1b00000000000000000000000080"], 0x48) bpf$PROG_LOAD(0x5, &(0x7f0000000540)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b704000002010000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback=0x17, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r1 = bpf$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) [ 74.884149][ T46] Bluetooth: hci0: command tx timeout [ 74.967185][ T5318] [ 74.968650][ T5318] ============================= [ 74.971138][ T5318] WARNING: suspicious RCU usage [ 74.973331][ T5318] syzkaller #0 Not tainted [ 74.975381][ T5318] ----------------------------- [ 74.977989][ T5318] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 74.982829][ T5318] [ 74.982829][ T5318] other info that might help us debug this: [ 74.982829][ T5318] [ 74.988403][ T5318] [ 74.988403][ T5318] rcu_scheduler_active = 2, debug_locks = 1 [ 74.991823][ T5318] 1 lock held by syz.0.0/5318: [ 74.994065][ T5318] #0: ffffffff8e35a540 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x37/0x80 [ 74.998885][ T5318] [ 74.998885][ T5318] stack backtrace: [ 75.001472][ T5318] CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 75.001490][ T5318] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 75.001498][ T5318] Call Trace: [ 75.001504][ T5318] [ 75.001508][ T5318] dump_stack_lvl+0xe8/0x150 [ 75.001528][ T5318] lockdep_rcu_suspicious+0x13f/0x1d0 [ 75.001545][ T5318] get_callchain_entry+0x2b6/0x3c0 [ 75.001563][ T5318] get_perf_callchain+0xcb/0x830 [ 75.001580][ T5318] ? __pfx_get_perf_callchain+0x10/0x10 [ 75.001596][ T5318] ? __resched_curr+0x202/0x3f0 [ 75.001612][ T5318] __bpf_get_stack+0x445/0xab0 [ 75.001634][ T5318] ? __pfx___bpf_get_stack+0x10/0x10 [ 75.001652][ T5318] ? __lock_acquire+0x6b5/0x2cf0 [ 75.001665][ T5318] bpf_get_stack+0x33/0x50 [ 75.001680][ T5318] ? bpf_prog_e8e6327ccf46c9a7+0x46/0x4e [ 75.001691][ T5318] bpf_get_stack_raw_tp+0x1a9/0x220 [ 75.001708][ T5318] bpf_prog_e8e6327ccf46c9a7+0x46/0x4e [ 75.001719][ T5318] bpf_prog_run_pin_on_cpu+0x142/0x470 [ 75.001736][ T5318] bpf_prog_test_run_syscall+0x318/0x4c0 [ 75.001749][ T5318] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 75.001759][ T5318] ? __fget_files+0x2a/0x420 [ 75.001775][ T5318] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 75.001788][ T5318] bpf_prog_test_run+0x2c7/0x340 [ 75.001809][ T5318] __sys_bpf+0x5cb/0x920 [ 75.001827][ T5318] ? __pfx___sys_bpf+0x10/0x10 [ 75.001837][ T5318] ? __fget_files+0x2a/0x420 [ 75.001859][ T5318] ? rcu_is_watching+0x15/0xb0 [ 75.001878][ T5318] __x64_sys_bpf+0x7c/0x90 [ 75.001893][ T5318] do_syscall_64+0xe2/0xf80 [ 75.001910][ T5318] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 75.001921][ T5318] ? trace_irq_disable+0x37/0x100 [ 75.001932][ T5318] ? clear_bhb_loop+0x60/0xb0 [ 75.001943][ T5318] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 75.001950][ T5318] RIP: 0033:0x7fd8e659acb9 [ 75.001959][ T5318] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 [ 75.001967][ T5318] RSP: 002b:00007fd8e7416028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 75.001980][ T5318] RAX: ffffffffffffffda RBX: 00007fd8e6815fa0 RCX: 00007fd8e659acb9 [ 75.001998][ T5318] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a [ 75.002007][ T5318] RBP: 00007fd8e6608bf7 R08: 0000000000000000 R09: 0000000000000000 [ 75.002014][ T5318] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 75.002039][ T5318] R13: 00007fd8e6816038 R14: 00007fd8e6815fa0 R15: 00007ffc97796d78 [ 75.002057][ T5318]