program: r0 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0) connect$bt_l2cap(r0, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x7ff}, 0xe) r1 = syz_init_net_socket$bt_hidp(0x1f, 0x3, 0x6) r2 = socket(0x10, 0x3, 0x0) recvmmsg$unix(r2, &(0x7f0000005480)=[{{0x0, 0x0, &(0x7f0000002a00)=[{&(0x7f00000000c0)=""/52, 0x34}, {&(0x7f0000000480)=""/187, 0xbb}, {&(0x7f0000000640)=""/249, 0xf9}, {&(0x7f0000001940)=""/4096, 0x1000}], 0x4}}], 0x1, 0x0, 0x0) write(r2, &(0x7f0000000100)="1400000052004f7fb3e4bf80a000080000000000", 0x14) prctl$PR_SET_MM_MAP(0x23, 0xe, &(0x7f0000000080)={&(0x7f0000ff0000/0x1000)=nil, &(0x7f0000ff0000/0x10000)=nil, &(0x7f0000ffc000/0x4000)=nil, &(0x7f0000fff000/0x1000)=nil, &(0x7f0000ff8000/0x4000)=nil, &(0x7f0000ff8000/0x3000)=nil, &(0x7f0000ffb000/0x3000)=nil, &(0x7f0000ff6000/0x2000)=nil, &(0x7f0000ffc000/0x3000)=nil, &(0x7f0000ffa000/0x1000)=nil, &(0x7f0000ffa000/0x2000)=nil, 0x0}, 0x68) sendmsg$NFT_BATCH(0xffffffffffffffff, &(0x7f0000000080)={0x0, 0x0, 0x0}, 0x24004045) r3 = io_uring_setup(0x1b7b, &(0x7f0000000040)={0x0, 0x970, 0x1f480, 0x0, 0x399}) bpf$BPF_PROG_TEST_RUN(0xa, &(0x7f0000000000)={0xffffffffffffffff, 0x18000000000002a0, 0x0, 0x0, 0x0, 0x0, 0x500, 0x60000000, 0x0, 0x0, 0x0, 0x0, 0x2}, 0x50) io_uring_enter(r3, 0x8ae, 0x6933, 0x17, 0x0, 0xeffd) ioctl$sock_bt_hidp_HIDPCONNADD(r1, 0x400448c8, &(0x7f0000000280)={r0, r0, 0x2c, 0x1, &(0x7f0000000340)='\x00', 0x9, 0x1, 0x457, 0x3, 0x9, 0x3, 0x1, 'syz1\x00'}) r4 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$sock_bt_hci(r4, 0x400448ca, 0x0) [ 84.611542][ T45] Bluetooth: hci0: command tx timeout [ 84.868183][ T5316] hid-multitouch 0005:0457:0003.0002: unknown main item tag 0x0 [ 84.879936][ T5316] hid-multitouch 0005:0457:0003.0002: hidraw1: BLUETOOTH HID v0.09 Device [syz1] on aa:aa:aa:aa:aa:aa [ 84.899541][ T5318] [ 84.900500][ T5318] ====================================================== [ 84.902858][ T5318] WARNING: possible circular locking dependency detected [ 84.905620][ T5318] syzkaller #0 Not tainted [ 84.907486][ T5318] ------------------------------------------------------ [ 84.910373][ T5318] syz.0.0/5318 is trying to acquire lock: [ 84.912666][ T5318] ffff888041b9e840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0x100/0xc50 [ 84.917538][ T5318] [ 84.917538][ T5318] but task is already holding lock: [ 84.920631][ T5318] ffff888041b9eaf8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5c0 [ 84.924100][ T5318] [ 84.924100][ T5318] which lock already depends on the new lock. [ 84.924100][ T5318] [ 84.928086][ T5318] [ 84.928086][ T5318] the existing dependency chain (in reverse order) is: [ 84.932104][ T5318] [ 84.932104][ T5318] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 84.936281][ T5318] __mutex_lock+0x19f/0x1300 [ 84.939114][ T5318] l2cap_info_timeout+0x60/0xa0 [ 84.942181][ T5318] process_scheduled_works+0xb02/0x1830 [ 84.945646][ T5318] worker_thread+0xa50/0xfc0 [ 84.948625][ T5318] kthread+0x388/0x470 [ 84.950851][ T5318] ret_from_fork+0x51e/0xb90 [ 84.953087][ T5318] ret_from_fork_asm+0x1a/0x30 [ 84.955463][ T5318] [ 84.955463][ T5318] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 84.960045][ T5318] __lock_acquire+0x15a5/0x2cf0 [ 84.962471][ T5318] lock_acquire+0xf0/0x2e0 [ 84.964654][ T5318] __flush_work+0x700/0xc50 [ 84.966915][ T5318] __cancel_work_sync+0xbe/0x110 [ 84.969315][ T5318] l2cap_conn_del+0x40f/0x5c0 [ 84.971538][ T5318] hci_conn_hash_flush+0x10d/0x260 [ 84.973995][ T5318] hci_dev_close_sync+0x821/0x10e0 [ 84.976449][ T5318] hci_dev_close+0x108/0x260 [ 84.978763][ T5318] sock_do_ioctl+0x101/0x320 [ 84.981102][ T5318] sock_ioctl+0x5c6/0x7f0 [ 84.983339][ T5318] __se_sys_ioctl+0xfc/0x170 [ 84.985615][ T5318] do_syscall_64+0x14d/0xf80 [ 84.987932][ T5318] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.990786][ T5318] [ 84.990786][ T5318] other info that might help us debug this: [ 84.990786][ T5318] [ 84.995177][ T5318] Possible unsafe locking scenario: [ 84.995177][ T5318] [ 84.998574][ T5318] CPU0 CPU1 [ 85.000962][ T5318] ---- ---- [ 85.003317][ T5318] lock(&conn->lock#2); [ 85.005192][ T5318] lock((work_completion)(&(&conn->info_timer)->work)); [ 85.009225][ T5318] lock(&conn->lock#2); [ 85.012144][ T5318] lock((work_completion)(&(&conn->info_timer)->work)); [ 85.015147][ T5318] [ 85.015147][ T5318] *** DEADLOCK *** [ 85.015147][ T5318] [ 85.018771][ T5318] 5 locks held by syz.0.0/5318: [ 85.021481][ T5318] #0: ffff88801bf08ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x260 [ 85.026233][ T5318] #1: ffff88801bf080c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x10e0 [ 85.030904][ T5318] #2: ffffffff8fd56728 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 [ 85.035016][ T5318] #3: ffff888041b9eaf8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5c0 [ 85.039201][ T5318] #4: ffffffff8e7603e0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x100/0xc50 [ 85.043114][ T5318] [ 85.043114][ T5318] stack backtrace: [ 85.045692][ T5318] CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 85.045707][ T5318] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 85.045769][ T5318] Call Trace: [ 85.045776][ T5318] [ 85.045780][ T5318] dump_stack_lvl+0xe8/0x150 [ 85.045793][ T5318] print_circular_bug+0x2e1/0x300 [ 85.045805][ T5318] check_noncircular+0x12e/0x150 [ 85.045816][ T5318] __lock_acquire+0x15a5/0x2cf0 [ 85.045825][ T5318] ? do_raw_spin_lock+0x12b/0x2f0 [ 85.045833][ T5318] ? do_raw_spin_unlock+0x4d/0x210 [ 85.045839][ T5318] lock_acquire+0xf0/0x2e0 [ 85.045850][ T5318] ? __flush_work+0x100/0xc50 [ 85.045863][ T5318] ? __flush_work+0x100/0xc50 [ 85.045876][ T5318] __flush_work+0x700/0xc50 [ 85.045888][ T5318] ? __flush_work+0x100/0xc50 [ 85.045900][ T5318] ? __flush_work+0x100/0xc50 [ 85.045914][ T5318] ? __pfx___flush_work+0x10/0x10 [ 85.045926][ T5318] ? __pfx_wq_barrier_func+0x10/0x10 [ 85.045942][ T5318] ? __cancel_work_sync+0x5c/0x110 [ 85.045957][ T5318] __cancel_work_sync+0xbe/0x110 [ 85.045970][ T5318] l2cap_conn_del+0x40f/0x5c0 [ 85.045985][ T5318] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 85.045996][ T5318] hci_conn_hash_flush+0x10d/0x260 [ 85.046008][ T5318] hci_dev_close_sync+0x821/0x10e0 [ 85.046020][ T5318] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 85.046030][ T5318] ? lockdep_hardirqs_on+0x7a/0x110 [ 85.046046][ T5318] ? enable_work+0x1fd/0x230 [ 85.046063][ T5318] hci_dev_close+0x108/0x260 [ 85.046076][ T5318] sock_do_ioctl+0x101/0x320 [ 85.046089][ T5318] ? __pfx_sock_do_ioctl+0x10/0x10 [ 85.046098][ T5318] ? do_futex+0x395/0x420 [ 85.046188][ T5318] sock_ioctl+0x5c6/0x7f0 [ 85.046204][ T5318] ? __pfx_sock_ioctl+0x10/0x10 [ 85.046219][ T5318] ? __fget_files+0x2a/0x420 [ 85.046232][ T5318] ? __fget_files+0x3a0/0x420 [ 85.046243][ T5318] ? __fget_files+0x2a/0x420 [ 85.046253][ T5318] ? bpf_lsm_file_ioctl+0x9/0x20 [ 85.046289][ T5318] ? __pfx_sock_ioctl+0x10/0x10 [ 85.046304][ T5318] __se_sys_ioctl+0xfc/0x170 [ 85.046321][ T5318] do_syscall_64+0x14d/0xf80 [ 85.046336][ T5318] ? trace_irq_disable+0x3b/0x150 [ 85.046369][ T5318] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.046380][ T5318] ? clear_bhb_loop+0x40/0x90 [ 85.046389][ T5318] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.046400][ T5318] RIP: 0033:0x7f4dae59bf79 [ 85.046411][ 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 [ 85.046420][ T5318] RSP: 002b:00007f4daf40c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 85.046451][ T5318] RAX: ffffffffffffffda RBX: 00007f4dae815fa0 RCX: 00007f4dae59bf79 [ 85.046456][ T5318] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000007 [ 85.046460][ T5318] RBP: 00007f4dae6327e0 R08: 0000000000000000 R09: 0000000000000000 [ 85.046465][ T5318] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 85.046469][ T5318] R13: 00007f4dae816038 R14: 00007f4dae815fa0 R15: 00007ffd5a38a308 [ 85.046476][ T5318] [ 85.195932][ T5325] fido_id[5325]: Failed to open report descriptor at '/sys/devices/virtual/bluetooth/hci0/hci0:200/report_descriptor': No such file or directory [ 86.629605][ T4662] Bluetooth: hci0: command tx timeout [ 88.709854][ T4662] Bluetooth: hci0: command tx timeout [ 90.789606][ T4662] Bluetooth: hci0: command tx timeout