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VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVUVduBYAAAAAECYv3UYPRsAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAlwIAAP//WKHPZA==") 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 = openat$cuse(0xffffffffffffff9c, &(0x7f0000000200), 0x2, 0x0) ioctl$FUSE_DEV_IOC_BACKING_CLOSE(r1, 0x4004e502, &(0x7f0000000240)=0xffffffff) r2 = syz_init_net_socket$bt_hidp(0x1f, 0x3, 0x6) ioctl$sock_bt_hidp_HIDPCONNADD(0xffffffffffffffff, 0x400448c8, &(0x7f0000000480)={r2, r2, 0x80, 0xe1, &(0x7f00000002c0)="789c758d083716b9c22b892c68a7a5dc8efa643e17774d9374388e97ea1f9ff320ff4b4c25f1f6ffca902f9167247c11a61118e9fed819f9f4202e05ac903f40e9102e42be8b4b30cb1ef523cc282a12aba63cc122b7de43b7799311b9313f8b1ec55d3056ef591cdba1d4130cc786905d86583211115bf7fc64630db57338c31da30109463171dcfb2ede22efba5b72c015a372db8ef920bfefc09d44e91f66cc12db78c5eeb2135c5ad0f8cea263060eb4245c1ba2165857973eb9e587d35d87313977b1d8327a9b1ba9eaa661a7afac35621bd66b9567d83a27fa3a92e13106", 0x6c, 0x80, 0x9d9, 0x8001, 0x3954, 0x3, 0x0, 'syz1\x00'}) ioctl$sock_bt_hidp_HIDPCONNADD(r2, 0x400448c8, &(0x7f00000000c0)={r0, r0, 0x206, 0x0, 0x0, 0x2, 0x72, 0x1, 0x3, 0x7, 0x0, 0x8, 'syz1\x00'}) r3 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$sock_bt_hci(r3, 0x400448ca, 0x0) r4 = openat(0xffffffffffffff9c, &(0x7f0000000040)='./file1\x00', 0x42, 0x0) pwrite64(r4, &(0x7f0000000000)='!', 0x1, 0x9000) [ 85.690432][ T5341] Bluetooth: hci0: command tx timeout [ 86.053047][ T5366] loop0: detected capacity change from 0 to 32768 [ 86.067988][ T5366] BTRFS: device fsid ed167579-eb65-4e76-9a50-61ac97e9b59d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5366) [ 86.097830][ T5366] BTRFS info (device loop0): first mount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d [ 86.108637][ T5366] BTRFS info (device loop0): using sha256 (sha256-lib) checksum algorithm [ 86.171052][ T5366] BTRFS info (device loop0): enabling ssd optimizations [ 86.174268][ T5366] BTRFS info (device loop0): using spread ssd allocation scheme [ 86.177538][ T5366] BTRFS info (device loop0): disabling tree log [ 86.191406][ T5366] BTRFS info (device loop0): enabling free space tree [ 86.194250][ T5366] BTRFS info (device loop0): enabling auto defrag [ 86.196847][ T5366] BTRFS info (device loop0): max_inline set to 4096 [ 86.233628][ T5366] input: Bluetooth HID Boot Protocol Device as /devices/virtual/bluetooth/hci0/hci0:200/input5 [ 86.452404][ T5367] [ 86.453576][ T5367] ====================================================== [ 86.456569][ T5367] WARNING: possible circular locking dependency detected [ 86.459596][ T5367] syzkaller #0 Not tainted [ 86.461516][ T5367] ------------------------------------------------------ [ 86.464534][ T5367] syz.0.0/5367 is trying to acquire lock: [ 86.467064][ T5367] ffff8880455b6840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0xd2/0xbc0 [ 86.472303][ T5367] [ 86.472303][ T5367] but task is already holding lock: [ 86.475462][ T5367] ffff8880455b6b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680 [ 86.479416][ T5367] [ 86.479416][ T5367] which lock already depends on the new lock. [ 86.479416][ T5367] [ 86.483775][ T5367] [ 86.483775][ T5367] the existing dependency chain (in reverse order) is: [ 86.487745][ T5367] [ 86.487745][ T5367] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 86.490980][ T5367] lock_acquire+0x120/0x360 [ 86.493184][ T5367] __mutex_lock+0x187/0x1350 [ 86.495537][ T5367] l2cap_info_timeout+0x60/0xa0 [ 86.497979][ T5367] process_scheduled_works+0xae1/0x17b0 [ 86.500668][ T5367] worker_thread+0x8a0/0xda0 [ 86.502972][ T5367] kthread+0x70e/0x8a0 [ 86.504981][ T5367] ret_from_fork+0x439/0x7d0 [ 86.507244][ T5367] ret_from_fork_asm+0x1a/0x30 [ 86.509489][ T5367] [ 86.509489][ T5367] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 86.513900][ T5367] validate_chain+0xb9b/0x2140 [ 86.516279][ T5367] __lock_acquire+0xab9/0xd20 [ 86.518564][ T5367] lock_acquire+0x120/0x360 [ 86.520782][ T5367] __flush_work+0x6b8/0xbc0 [ 86.522985][ T5367] __cancel_work_sync+0xbe/0x110 [ 86.525295][ T5367] l2cap_conn_del+0x4f0/0x680 [ 86.527544][ T5367] hci_conn_hash_flush+0x10a/0x230 [ 86.530323][ T5367] hci_dev_close_sync+0xaef/0x1330 [ 86.533211][ T5367] hci_dev_close+0x108/0x200 [ 86.535388][ T5367] sock_do_ioctl+0xdc/0x300 [ 86.537602][ T5367] sock_ioctl+0x576/0x790 [ 86.539891][ T5367] __se_sys_ioctl+0xfc/0x170 [ 86.542165][ T5367] do_syscall_64+0xfa/0x3b0 [ 86.544402][ T5367] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.547242][ T5367] [ 86.547242][ T5367] other info that might help us debug this: [ 86.547242][ T5367] [ 86.551545][ T5367] Possible unsafe locking scenario: [ 86.551545][ T5367] [ 86.554650][ T5367] CPU0 CPU1 [ 86.556993][ T5367] ---- ---- [ 86.559388][ T5367] lock(&conn->lock#2); [ 86.561287][ T5367] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.565428][ T5367] lock(&conn->lock#2); [ 86.568345][ T5367] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.571338][ T5367] [ 86.571338][ T5367] *** DEADLOCK *** [ 86.571338][ T5367] [ 86.574873][ T5367] 5 locks held by syz.0.0/5367: [ 86.577030][ T5367] #0: ffff888032cfcdc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x200 [ 86.581148][ T5367] #1: ffff888032cfc0b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x66a/0x1330 [ 86.585298][ T5367] #2: ffffffff8f8a1128 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x230 [ 86.589589][ T5367] #3: ffff8880455b6b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680 [ 86.593540][ T5367] #4: ffffffff8e33a0e0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xd2/0xbc0 [ 86.597379][ T5367] [ 86.597379][ T5367] stack backtrace: [ 86.600020][ T5367] CPU: 0 UID: 0 PID: 5367 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 86.600037][ T5367] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 86.600045][ T5367] Call Trace: [ 86.600053][ T5367] [ 86.600060][ T5367] dump_stack_lvl+0x189/0x250 [ 86.600080][ T5367] ? __pfx_dump_stack_lvl+0x10/0x10 [ 86.600092][ T5367] ? __pfx__printk+0x10/0x10 [ 86.600109][ T5367] ? print_lock_name+0xde/0x100 [ 86.600124][ T5367] print_circular_bug+0x2ee/0x310 [ 86.600137][ T5367] check_noncircular+0x134/0x160 [ 86.600150][ T5367] validate_chain+0xb9b/0x2140 [ 86.600163][ T5367] ? do_raw_spin_lock+0x121/0x290 [ 86.600177][ T5367] ? look_up_lock_class+0x74/0x170 [ 86.600189][ T5367] ? register_lock_class+0x51/0x320 [ 86.600207][ T5367] __lock_acquire+0xab9/0xd20 [ 86.600223][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.600236][ T5367] lock_acquire+0x120/0x360 [ 86.600250][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.600263][ T5367] ? _raw_spin_unlock_irq+0x23/0x50 [ 86.600280][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.600291][ T5367] __flush_work+0x6b8/0xbc0 [ 86.600303][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.600315][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.600329][ T5367] ? __pfx___flush_work+0x10/0x10 [ 86.600340][ T5367] ? __pfx_wq_barrier_func+0x10/0x10 [ 86.600354][ T5367] ? __pfx___cancel_work+0x10/0x10 [ 86.600369][ T5367] ? hci_conn_drop+0x14d/0x280 [ 86.600384][ T5367] __cancel_work_sync+0xbe/0x110 [ 86.600396][ T5367] l2cap_conn_del+0x4f0/0x680 [ 86.600410][ T5367] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 86.600422][ T5367] hci_conn_hash_flush+0x10a/0x230 [ 86.600436][ T5367] hci_dev_close_sync+0xaef/0x1330 [ 86.600449][ T5367] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 86.600460][ T5367] ? do_raw_read_unlock+0x3d/0x80 [ 86.600475][ T5367] hci_dev_close+0x108/0x200 [ 86.600487][ T5367] sock_do_ioctl+0xdc/0x300 [ 86.600502][ T5367] ? __pfx_sock_do_ioctl+0x10/0x10 [ 86.600516][ T5367] ? __lock_acquire+0xab9/0xd20 [ 86.600535][ T5367] sock_ioctl+0x576/0x790 [ 86.600549][ T5367] ? __pfx_sock_ioctl+0x10/0x10 [ 86.600561][ T5367] ? __fget_files+0x2a/0x420 [ 86.600574][ T5367] ? __fget_files+0x3a0/0x420 [ 86.600587][ T5367] ? __fget_files+0x2a/0x420 [ 86.600603][ T5367] ? bpf_lsm_file_ioctl+0x9/0x20 [ 86.600616][ T5367] ? __pfx_sock_ioctl+0x10/0x10 [ 86.600630][ T5367] __se_sys_ioctl+0xfc/0x170 [ 86.600643][ T5367] do_syscall_64+0xfa/0x3b0 [ 86.600654][ T5367] ? lockdep_hardirqs_on+0x9c/0x150 [ 86.600665][ T5367] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.600677][ T5367] ? clear_bhb_loop+0x60/0xb0 [ 86.600689][ T5367] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.600700][ T5367] RIP: 0033:0x7fd673f8eec9 [ 86.600711][ T5367] 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 [ 86.600721][ T5367] RSP: 002b:00007fd674ed6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 86.600734][ T5367] RAX: ffffffffffffffda RBX: 00007fd6741e6090 RCX: 00007fd673f8eec9 [ 86.600742][ T5367] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000008 [ 86.600749][ T5367] RBP: 00007fd674011f91 R08: 0000000000000000 R09: 0000000000000000 [ 86.600756][ T5367] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 86.600763][ T5367] R13: 00007fd6741e6128 R14: 00007fd6741e6090 R15: 00007ffc46cd2488 [ 86.600775][ T5367] [ 86.767146][ T54] cfg80211: failed to load regulatory.db [ 87.710479][ T5341] Bluetooth: hci0: command tx timeout [ 89.792019][ T5341] Bluetooth: hci0: command tx timeout [ 91.870412][ T5341] Bluetooth: hci0: command tx timeout