program: recvmsg$unix(0xffffffffffffffff, 0x0, 0x0) write$cgroup_subtree(0xffffffffffffffff, 0x0, 0xfdef) bpf$PROG_LOAD(0x5, &(0x7f0000000500)={0x6, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="180000000000000000000000fdffffde18000000", @ANYRES32, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b704000000000000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x41000, 0x0, '\x00', 0x0, @fallback=0x2d, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r0 = bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x1f, 0xc, &(0x7f0000000440)=ANY=[], &(0x7f0000000180)='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)={r0}, 0xc) [ 78.430049][ T5319] [ 78.431552][ T5319] ============================= [ 78.433607][ T5319] WARNING: suspicious RCU usage [ 78.435651][ T5319] syzkaller #0 Not tainted [ 78.437660][ T5319] ----------------------------- [ 78.439790][ T5319] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 78.443409][ T5319] [ 78.443409][ T5319] other info that might help us debug this: [ 78.443409][ T5319] [ 78.449266][ T5319] [ 78.449266][ T5319] rcu_scheduler_active = 2, debug_locks = 1 [ 78.453017][ T5319] locks held by syz.0.0/5319: 1, last CPU#0: [ 78.455505][ T5319] #0: ffffffff8ed5cb18 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_read_lock_trace+0x25/0x110 [ 78.460253][ T5319] [ 78.460253][ T5319] stack backtrace: [ 78.462830][ T5319] CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 78.466825][ T5319] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 78.471037][ T5319] Call Trace: [ 78.474967][ T5319] [ 78.476615][ T5319] dump_stack_lvl+0xe8/0x150 [ 78.478975][ T5319] lockdep_rcu_suspicious+0x140/0x1d0 [ 78.481481][ T5319] get_callchain_entry+0x2b7/0x3c0 [ 78.483560][ T5319] get_perf_callchain+0xd5/0x880 [ 78.485617][ T5319] ? __pfx_get_perf_callchain+0x10/0x10 [ 78.487866][ T5319] ? __lock_acquire+0x747/0x2de0 [ 78.489907][ T5319] __bpf_get_stack+0x375/0xae0 [ 78.491996][ T5319] ? __pfx___bpf_get_stack+0x10/0x10 [ 78.494257][ T5319] ? __lock_acquire+0x747/0x2de0 [ 78.496365][ T5319] ? lock_acquire+0x115/0x350 [ 78.498527][ T5319] ? bpf_prog_42db8cfdf50901c9+0x46/0x4e [ 78.501034][ T5319] bpf_get_stack_raw_tp+0x1a4/0x210 [ 78.503312][ T5319] bpf_prog_42db8cfdf50901c9+0x46/0x4e [ 78.505701][ T5319] bpf_prog_run_pin_on_cpu+0x14f/0x4c0 [ 78.508126][ T5319] bpf_prog_test_run_syscall+0x324/0x4c0 [ 78.510617][ T5319] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 78.513463][ T5319] ? __fget_files+0x2a/0x420 [ 78.515360][ T5319] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 78.517852][ T5319] bpf_prog_test_run+0x2c5/0x340 [ 78.519852][ T5319] __sys_bpf+0xa22/0xda0 [ 78.521579][ T5319] ? __pfx___sys_bpf+0x10/0x10 [ 78.523462][ T5319] ? do_futex+0x458/0x4e0 [ 78.525214][ T5319] ? rcu_is_watching+0x16/0xb0 [ 78.527104][ T5319] __x64_sys_bpf+0xba/0xd0 [ 78.528971][ T5319] do_syscall_64+0x166/0x520 [ 78.531026][ T5319] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 78.533706][ T5319] ? clear_bhb_loop+0x70/0xc0 [ 78.535743][ T5319] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 78.538347][ T5319] RIP: 0033:0x7fd79cb9e159 [ 78.540366][ T5319] 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 [ 78.548776][ T5319] RSP: 002b:00007fd79d97ffe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 78.552414][ T5319] RAX: ffffffffffffffda RBX: 00007fd79ce25fa0 RCX: 00007fd79cb9e159 [ 78.555901][ T5319] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a [ 78.559285][ T5319] RBP: 00007fd79cc3506b R08: 0000000000000000 R09: 0000000000000000 [ 78.562835][ T5319] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 78.566324][ T5319] R13: 00007fd79ce26038 R14: 00007fd79ce25fa0 R15: 00007ffd928d46f8 [ 78.569656][ T5319] [ 78.586261][ T5278] Bluetooth: hci0: command tx timeout