program: bpf$ENABLE_STATS(0x20, 0x0, 0x0) r0 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000, 0x0, 0xffffffffffffffff, 0x0, '\x00', 0x0, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, @void, @value, @void, @value}, 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x0, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r0, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b704000002010000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @void, @value}, 0x90) r1 = bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={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, 0x0, @void, @value}, 0x90) bpf$BPF_GET_PROG_INFO(0xa, &(0x7f0000000740)={r1, 0x0, 0x0}, 0x10) [ 75.593741][ T5323] [ 75.594884][ T5323] ============================= [ 75.596939][ T5323] WARNING: suspicious RCU usage [ 75.599001][ T5323] 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 Not tainted [ 75.601989][ T5323] ----------------------------- [ 75.603942][ T5323] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 75.607333][ T5323] [ 75.607333][ T5323] other info that might help us debug this: [ 75.607333][ T5323] [ 75.611369][ T5323] [ 75.611369][ T5323] rcu_scheduler_active = 2, debug_locks = 1 [ 75.614786][ T5323] 1 lock held by syz.0.0/5323: [ 75.616985][ T5323] #0: ffffffff8df3ba40 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 75.621205][ T5323] [ 75.621205][ T5323] stack backtrace: [ 75.623920][ T5323] CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(full) [ 75.623936][ T5323] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 75.623944][ T5323] Call Trace: [ 75.623953][ T5323] [ 75.623959][ T5323] dump_stack_lvl+0x189/0x250 [ 75.623981][ T5323] ? __pfx_dump_stack_lvl+0x10/0x10 [ 75.623997][ T5323] ? __pfx__printk+0x10/0x10 [ 75.624016][ T5323] lockdep_rcu_suspicious+0x140/0x1d0 [ 75.624034][ T5323] get_callchain_entry+0x2b6/0x3c0 [ 75.624051][ T5323] get_perf_callchain+0xa1/0x6b0 [ 75.624069][ T5323] ? __pfx_get_perf_callchain+0x10/0x10 [ 75.624087][ T5323] ? preempt_schedule+0xae/0xc0 [ 75.624105][ T5323] __bpf_get_stack+0x3fc/0xa60 [ 75.624124][ T5323] ? __pfx___bpf_get_stack+0x10/0x10 [ 75.624138][ T5323] ? __lock_acquire+0xaac/0xd20 [ 75.624154][ T5323] bpf_get_stack+0x33/0x50 [ 75.624166][ T5323] ? bpf_prog_b8a90dd1efcc4ad9+0x46/0x4a [ 75.624176][ T5323] bpf_get_stack_raw_tp+0x195/0x220 [ 75.624190][ T5323] bpf_prog_b8a90dd1efcc4ad9+0x46/0x4a [ 75.624200][ T5323] bpf_prog_run_pin_on_cpu+0xbc/0x150 [ 75.624214][ T5323] bpf_prog_test_run_syscall+0x312/0x4b0 [ 75.624226][ T5323] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 75.624235][ T5323] ? __fget_files+0x2a/0x420 [ 75.624300][ T5323] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 75.624312][ T5323] bpf_prog_test_run+0x2a9/0x340 [ 75.624329][ T5323] __sys_bpf+0x4a4/0x860 [ 75.624344][ T5323] ? __pfx___sys_bpf+0x10/0x10 [ 75.624354][ T5323] ? rcu_is_watching+0x15/0xb0 [ 75.624377][ T5323] ? rcu_is_watching+0x15/0xb0 [ 75.624397][ T5323] __x64_sys_bpf+0x7c/0x90 [ 75.624408][ T5323] do_syscall_64+0xf6/0x210 [ 75.624421][ T5323] ? clear_bhb_loop+0x45/0xa0 [ 75.624434][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 75.624446][ T5323] RIP: 0033:0x7fba9a38e969 [ 75.624457][ T5323] 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 [ 75.624466][ T5323] RSP: 002b:00007fba9b17f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 75.624478][ T5323] RAX: ffffffffffffffda RBX: 00007fba9a5b5fa0 RCX: 00007fba9a38e969 [ 75.624486][ T5323] RDX: 0000000000000010 RSI: 0000200000000740 RDI: 000000000000000a [ 75.624494][ T5323] RBP: 00007fba9a410ab1 R08: 0000000000000000 R09: 0000000000000000 [ 75.624500][ T5323] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 75.624506][ T5323] R13: 0000000000000000 R14: 00007fba9a5b5fa0 R15: 00007fff66ceddc8 [ 75.624524][ T5323] [ 75.745488][ T4664] Bluetooth: hci0: command tx timeout