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r0 = socket$alg(0x26, 0x5, 0x0) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, 0x0, 0x0) r1 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000000)='fdinfo/3\x00') prctl$PR_SET_SECCOMP(0x16, 0x1, 0x0) read$eventfd(r1, &(0x7f0000000340), 0x8) r2 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0) connect$bt_l2cap(r2, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x7ff}, 0xe) r3 = syz_init_net_socket$bt_hidp(0x1f, 0x3, 0x6) ioctl$sock_bt_hidp_HIDPCONNADD(r3, 0x400448c8, &(0x7f00000000c0)={r2, r2, 0x206, 0x0, 0x0, 0x2, 0x72, 0x1, 0x3, 0x7, 0x0, 0x8, 'syz1\x00'}) r4 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$sock_bt_hci(r4, 0x400448ca, 0x0) ioctl$KVM_GET_XCRS(0xffffffffffffffff, 0x8188aea6, &(0x7f0000000300)) chdir(&(0x7f0000000140)='./file0\x00') listen(r1, 0x2) r5 = openat(0xffffffffffffff9c, &(0x7f0000000040)='./file1\x00', 0x42, 0x0) r6 = openat(0xffffffffffffff9c, &(0x7f00000002c0)='./file1\x00', 0x42, 0x0) pwritev2(r6, &(0x7f00000000c0)=[{&(0x7f0000000200)="df", 0x1}], 0x1, 0x800001, 0x0, 0x0) ioctl$EXT4_IOC_MOVE_EXT(r5, 0x40305829, &(0x7f00000000c0)={0x17c04, 0xffffffffffffffff, 0x7, 0xfffffffd, 0x0, 0x7}) [ 76.263750][ T5323] loop0: detected capacity change from 0 to 32768 [ 76.272227][ T5299] Bluetooth: hci0: command tx timeout [ 76.280513][ T1313] ieee802154 phy0 wpan0: encryption failed: -22 [ 76.283471][ T1313] ieee802154 phy1 wpan1: encryption failed: -22 [ 76.342278][ T5323] BTRFS: device fsid 395ef67a-297e-477c-816d-cd80a5b93e5d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5323) [ 76.357068][ T5323] BTRFS info (device loop0): first mount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d [ 76.361202][ T5323] BTRFS info (device loop0): using sha256 (sha256-lib) checksum algorithm [ 76.484861][ T5323] BTRFS info (device loop0): enabling ssd optimizations [ 76.487796][ T5323] BTRFS info (device loop0): enabling free space tree [ 76.560457][ T25] audit: type=1326 audit(1760000152.488:2): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined pid=5322 comm="syz.0.0" exe="/syz-executor" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7fc20918eec9 code=0x0 [ 76.628677][ T5324] input: Bluetooth HID Boot Protocol Device as /devices/virtual/bluetooth/hci0/hci0:200/input5 [ 76.852148][ T5344] [ 76.853287][ T5344] ====================================================== [ 76.856313][ T5344] WARNING: possible circular locking dependency detected [ 76.859289][ T5344] syzkaller #0 Not tainted [ 76.861190][ T5344] ------------------------------------------------------ [ 76.864231][ T5344] syz.0.0/5344 is trying to acquire lock: [ 76.866697][ T5344] ffff8880438c9840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0xd2/0xbc0 [ 76.871033][ T5344] [ 76.871033][ T5344] but task is already holding lock: [ 76.873983][ T5344] ffff8880438c9b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680 [ 76.877531][ T5344] [ 76.877531][ T5344] which lock already depends on the new lock. [ 76.877531][ T5344] [ 76.881718][ T5344] [ 76.881718][ T5344] the existing dependency chain (in reverse order) is: [ 76.885908][ T5344] [ 76.885908][ T5344] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 76.889196][ T5344] lock_acquire+0x120/0x360 [ 76.891464][ T5344] __mutex_lock+0x187/0x1350 [ 76.893815][ T5344] l2cap_info_timeout+0x60/0xa0 [ 76.896193][ T5344] process_scheduled_works+0xae1/0x17b0 [ 76.898849][ T5344] worker_thread+0x8a0/0xda0 [ 76.901125][ T5344] kthread+0x711/0x8a0 [ 76.903146][ T5344] ret_from_fork+0x4bc/0x870 [ 76.905320][ T5344] ret_from_fork_asm+0x1a/0x30 [ 76.907613][ T5344] [ 76.907613][ T5344] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 76.912082][ T5344] validate_chain+0xb9b/0x2140 [ 76.914477][ T5344] __lock_acquire+0xab9/0xd20 [ 76.916725][ T5344] lock_acquire+0x120/0x360 [ 76.918956][ T5344] __flush_work+0x6b8/0xbc0 [ 76.921099][ T5344] __cancel_work_sync+0xbe/0x110 [ 76.923489][ T5344] l2cap_conn_del+0x4f0/0x680 [ 76.925745][ T5344] hci_conn_hash_flush+0x10a/0x230 [ 76.928187][ T5344] hci_dev_close_sync+0xaef/0x1330 [ 76.930689][ T5344] hci_dev_close+0x108/0x200 [ 76.932826][ T5344] sock_do_ioctl+0xdc/0x300 [ 76.935056][ T5344] sock_ioctl+0x576/0x790 [ 76.937132][ T5344] __se_sys_ioctl+0xfc/0x170 [ 76.939382][ T5344] do_syscall_64+0xfa/0xfa0 [ 76.941547][ T5344] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.944374][ T5344] [ 76.944374][ T5344] other info that might help us debug this: [ 76.944374][ T5344] [ 76.948756][ T5344] Possible unsafe locking scenario: [ 76.948756][ T5344] [ 76.951978][ T5344] CPU0 CPU1 [ 76.954408][ T5344] ---- ---- [ 76.956765][ T5344] lock(&conn->lock#2); [ 76.958580][ T5344] lock((work_completion)(&(&conn->info_timer)->work)); [ 76.963129][ T5344] lock(&conn->lock#2); [ 76.966201][ T5344] lock((work_completion)(&(&conn->info_timer)->work)); [ 76.969174][ T5344] [ 76.969174][ T5344] *** DEADLOCK *** [ 76.969174][ T5344] [ 76.972699][ T5344] 5 locks held by syz.0.0/5344: [ 76.974920][ T5344] #0: ffff88803425cdc8 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x200 [ 76.979140][ T5344] #1: ffff88803425c0b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x66a/0x1330 [ 76.983169][ T5344] #2: ffffffff8f64ac28 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x230 [ 76.987140][ T5344] #3: ffff8880438c9b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680 [ 76.990776][ T5344] #4: ffffffff8e13d320 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xd2/0xbc0 [ 76.994652][ T5344] [ 76.994652][ T5344] stack backtrace: [ 76.997218][ T5344] CPU: 0 UID: 0 PID: 5344 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 76.997233][ T5344] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 76.997239][ T5344] Call Trace: [ 76.997246][ T5344] [ 76.997252][ T5344] dump_stack_lvl+0x189/0x250 [ 76.997267][ T5344] ? __pfx_dump_stack_lvl+0x10/0x10 [ 76.997278][ T5344] ? __pfx__printk+0x10/0x10 [ 76.997290][ T5344] ? print_lock_name+0xde/0x100 [ 76.997301][ T5344] print_circular_bug+0x2ee/0x310 [ 76.997315][ T5344] check_noncircular+0x134/0x160 [ 76.997328][ T5344] validate_chain+0xb9b/0x2140 [ 76.997340][ T5344] ? do_raw_spin_lock+0x121/0x290 [ 76.997372][ T5344] ? look_up_lock_class+0x74/0x170 [ 76.997386][ T5344] ? register_lock_class+0x51/0x320 [ 76.997396][ T5344] __lock_acquire+0xab9/0xd20 [ 76.997409][ T5344] ? __flush_work+0xd2/0xbc0 [ 76.997421][ T5344] lock_acquire+0x120/0x360 [ 76.997430][ T5344] ? __flush_work+0xd2/0xbc0 [ 76.997442][ T5344] ? _raw_spin_unlock_irq+0x23/0x50 [ 76.997453][ T5344] ? __flush_work+0xd2/0xbc0 [ 76.997464][ T5344] __flush_work+0x6b8/0xbc0 [ 76.997475][ T5344] ? __flush_work+0xd2/0xbc0 [ 76.997487][ T5344] ? __flush_work+0xd2/0xbc0 [ 76.997496][ T5344] ? __pfx___flush_work+0x10/0x10 [ 76.997503][ T5344] ? __pfx_wq_barrier_func+0x10/0x10 [ 76.997511][ T5344] ? __pfx___cancel_work+0x10/0x10 [ 76.997519][ T5344] ? hci_conn_drop+0x14d/0x280 [ 76.997530][ T5344] __cancel_work_sync+0xbe/0x110 [ 76.997537][ T5344] l2cap_conn_del+0x4f0/0x680 [ 76.997546][ T5344] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 76.997554][ T5344] hci_conn_hash_flush+0x10a/0x230 [ 76.997565][ T5344] hci_dev_close_sync+0xaef/0x1330 [ 76.997577][ T5344] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 76.997589][ T5344] ? do_raw_read_unlock+0x3d/0x80 [ 76.997604][ T5344] hci_dev_close+0x108/0x200 [ 76.997616][ T5344] sock_do_ioctl+0xdc/0x300 [ 76.997629][ T5344] ? __pfx_sock_do_ioctl+0x10/0x10 [ 76.997643][ T5344] sock_ioctl+0x576/0x790 [ 76.997654][ T5344] ? __pfx_sock_ioctl+0x10/0x10 [ 76.997670][ T5344] ? __fget_files+0x3a0/0x420 [ 76.997685][ T5344] ? __fget_files+0x2a/0x420 [ 76.997700][ T5344] ? bpf_lsm_file_ioctl+0x9/0x20 [ 76.997710][ T5344] ? __pfx_sock_ioctl+0x10/0x10 [ 76.997750][ T5344] __se_sys_ioctl+0xfc/0x170 [ 76.997764][ T5344] do_syscall_64+0xfa/0xfa0 [ 76.997777][ T5344] ? lockdep_hardirqs_on+0x9c/0x150 [ 76.997789][ T5344] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.997799][ T5344] ? clear_bhb_loop+0x60/0xb0 [ 76.997806][ T5344] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.997813][ T5344] RIP: 0033:0x7fc20918eec9 [ 76.997821][ T5344] 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 [ 76.997828][ T5344] RSP: 002b:00007fc2055d4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 76.997837][ T5344] RAX: ffffffffffffffda RBX: 00007fc2093e6180 RCX: 00007fc20918eec9 [ 76.997842][ T5344] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000009 [ 76.997846][ T5344] RBP: 00007fc209211f91 R08: 0000000000000000 R09: 0000000000000000 [ 76.997850][ T5344] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 76.997855][ T5344] R13: 00007fc2093e6218 R14: 00007fc2093e6180 R15: 00007ffdc9310eb8 [ 76.997862][ T5344] [ 78.331921][ T4668] Bluetooth: hci0: command tx timeout [ 80.412127][ T4668] Bluetooth: hci0: command tx timeout [ 82.491991][ T4668] Bluetooth: hci0: command tx timeout