program: r0 = bpf$BPF_PROG_RAW_TRACEPOINT_LOAD(0x5, &(0x7f0000002c80)={0x3, 0xc, 0x0, 0x0}, 0x94) r1 = bpf$MAP_CREATE_CONST_STR(0x0, &(0x7f0000000340)=ANY=[], 0x50) bpf$BPF_MAP_CONST_STR_FREEZE(0x16, &(0x7f0000000640)={r1}, 0x4) r2 = bpf$MAP_CREATE(0x0, &(0x7f0000001440)=ANY=[@ANYBLOB="1b00000000000000000000000080"], 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r2, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b7040000f6000000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x40f00, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r3 = bpf$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$PROG_BIND_MAP(0xa, &(0x7f00000004c0)={r3, 0xffffffffffffffff, 0x2000000}, 0xc) bpf$BPF_PROG_TEST_RUN(0xa, &(0x7f00000002c0)={r0, 0x2f00, 0x0, 0x0, 0x0, 0x0, 0x2000, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x50) [ 103.606413][ T4650] Bluetooth: hci0: command tx timeout [ 103.684154][ T5330] [ 103.686061][ T5330] ============================= [ 103.688734][ T5330] WARNING: suspicious RCU usage [ 103.691129][ T5330] syzkaller #0 Not tainted [ 103.693157][ T5330] ----------------------------- [ 103.695488][ T5330] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 103.699838][ T5330] [ 103.699838][ T5330] other info that might help us debug this: [ 103.699838][ T5330] [ 103.705224][ T5330] [ 103.705224][ T5330] rcu_scheduler_active = 2, debug_locks = 1 [ 103.709877][ T5330] 1 lock held by syz.0.0/5330: [ 103.712918][ T5330] #0: ffffffff8e95cf58 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_read_lock_trace+0x25/0x110 [ 103.720159][ T5330] [ 103.720159][ T5330] stack backtrace: [ 103.723025][ T5330] CPU: 0 UID: 0 PID: 5330 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 103.723047][ T5330] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 103.723055][ T5330] Call Trace: [ 103.723064][ T5330] [ 103.723072][ T5330] dump_stack_lvl+0xe8/0x150 [ 103.723094][ T5330] lockdep_rcu_suspicious+0x13f/0x1d0 [ 103.723113][ T5330] get_callchain_entry+0x2b6/0x3c0 [ 103.723128][ T5330] get_perf_callchain+0xd5/0x880 [ 103.723144][ T5330] ? __pfx_get_perf_callchain+0x10/0x10 [ 103.723162][ T5330] __bpf_get_stack+0x445/0xab0 [ 103.723185][ T5330] ? __pfx___bpf_get_stack+0x10/0x10 [ 103.723200][ T5330] ? __lock_acquire+0x6b5/0x2cf0 [ 103.723214][ T5330] bpf_get_stack+0x33/0x50 [ 103.723227][ T5330] ? bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 103.723238][ T5330] bpf_get_stack_raw_tp+0x1a9/0x220 [ 103.723256][ T5330] bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 103.723268][ T5330] bpf_prog_run_pin_on_cpu+0x142/0x470 [ 103.723286][ T5330] bpf_prog_test_run_syscall+0x318/0x4c0 [ 103.723301][ T5330] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 103.723316][ T5330] ? __fget_files+0x2a/0x420 [ 103.723331][ T5330] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 103.723344][ T5330] bpf_prog_test_run+0x2c7/0x340 [ 103.723358][ T5330] __sys_bpf+0x643/0x950 [ 103.723375][ T5330] ? __pfx___sys_bpf+0x10/0x10 [ 103.723401][ T5330] ? rcu_is_watching+0x15/0xb0 [ 103.723417][ T5330] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 103.723438][ T5330] __x64_sys_bpf+0x7c/0x90 [ 103.723457][ T5330] do_syscall_64+0x15f/0xf80 [ 103.723470][ T5330] ? trace_irq_disable+0x3b/0x140 [ 103.723487][ T5330] ? clear_bhb_loop+0x40/0x90 [ 103.723500][ T5330] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 103.723513][ T5330] RIP: 0033:0x7fd85eb9cdd9 [ 103.723526][ T5330] 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 [ 103.723536][ T5330] RSP: 002b:00007fd85fa97fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 103.723549][ T5330] RAX: ffffffffffffffda RBX: 00007fd85ee15fa0 RCX: 00007fd85eb9cdd9 [ 103.723556][ T5330] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a [ 103.723563][ T5330] RBP: 00007fd85ec32d69 R08: 0000000000000000 R09: 0000000000000000 [ 103.723569][ T5330] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 103.723576][ T5330] R13: 00007fd85ee16038 R14: 00007fd85ee15fa0 R15: 00007fffd64ce088 [ 103.723594][ T5330]