program: r0 = socket$nl_xfrm(0x10, 0x3, 0x6) mknod$loop(&(0x7f0000000480)='./file0\x00', 0x0, 0x1) lstat(&(0x7f0000000400)='./file0\x00', &(0x7f0000000440)={0x0, 0x0, 0x0, 0x0, 0x0, 0x0}) lchown(&(0x7f00000014c0)='./file0\x00', r1, 0x0) setxattr$system_posix_acl(&(0x7f0000000200)='./file0\x00', &(0x7f0000000240)='system.posix_acl_access\x00', &(0x7f0000000040)={{}, {}, [], {}, [{0x8, 0x4, r2}], {0x10, 0x7}}, 0x2c, 0x0) setsockopt$netlink_NETLINK_TX_RING(0xffffffffffffffff, 0x10e, 0xc, 0x0, 0x0) r3 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) r4 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0) connect$bt_l2cap(r4, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x7ff}, 0xe) r5 = syz_init_net_socket$bt_hidp(0x1f, 0x3, 0x6) ioctl$sock_bt_hidp_HIDPCONNADD(r5, 0x400448c8, &(0x7f0000000280)={r4, r4, 0xc, 0x1, &(0x7f0000000340)='\x00', 0x9, 0x1, 0x457, 0x9, 0x9, 0x1, 0x1, 'syz1\x00'}) ioctl$sock_bt_hci(r3, 0x400448ca, 0x0) openat$dir(0xffffffffffffff9c, &(0x7f0000000000)='./file0\x00', 0x0, 0x0) sendmsg$nl_xfrm(r0, &(0x7f0000000380)={0x0, 0x0, &(0x7f0000000300)={&(0x7f0000000000)=@delsa={0x28, 0x11, 0x1, 0x70bd27, 0x25dfdbfd, {@in=@multicast1, 0x4d6, 0x0, 0x33}}, 0x28}, 0x1, 0x0, 0x0, 0x4008010}, 0x40080) syz_clone(0x100, &(0x7f00000000c0)="e888ce4e643ea43390fc7307ead3bd06dbdc9bafc6038e4ef33f3e13522735e2c0922b9d0dbc5bb4234666dafdc951f7464e9fc9dff41d00ff01339fd2565f40e7c3a293e33472aab7985ed1e26b544e5a1a3ddb5f1bf05952d0d6383cdae414254fc137192ed455fcb2f4279ecf14effeb45e1fca30c386ae75ab414ff96678e85ae35ce8a0e098a33a9a144dd60704bee260da1b2b829ab15764a158c2ae7c385b59c95cbd21eaf000b9e6e596c413", 0xb0, &(0x7f0000000180), &(0x7f00000001c0), &(0x7f00000004c0)="73a1ca5c96314b7048144071ecf3e453e1df22071f066629abef71ee72770b5f67d350a4ae8a4d8f94af8fc41a754cf56d7b4d615864f2b7b8b5272ad4e72c2b76236b22f569f509bbd68129ca5e4f09d71bff4ebb375d84aeecdeef7986e87f2636d52e33ee055f3fc97dae94cf3ae4b42daf80def78e87dba885f8afb5574cbd330e99e170ab9c83ab826627cbca0072413c23b429810791874dd0c262225820aa01d364634a5af3e4b72cd4ed75a9f115efd218ed0c5e8140b009faf8a598db6e6290eb65") [ 86.133868][ T5312] Bluetooth: hci0: command tx timeout [ 86.244670][ T5311] hid-multitouch 0005:0457:0009.0002: unknown main item tag 0x0 [ 86.272247][ T5311] hid-multitouch 0005:0457:0009.0002: hidraw1: BLUETOOTH HID v0.09 Device [syz1] on aa:aa:aa:aa:aa:aa [ 86.386022][ T5337] [ 86.387113][ T5337] ====================================================== [ 86.389677][ T5337] WARNING: possible circular locking dependency detected [ 86.392799][ T5337] 6.16.0-rc1-syzkaller-00236-g8c6bc74c7f89 #0 Not tainted [ 86.395767][ T5337] ------------------------------------------------------ [ 86.398495][ T5337] syz.0.0/5337 is trying to acquire lock: [ 86.400792][ T5337] ffff888035802040 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0xd2/0xbc0 [ 86.406002][ T5337] [ 86.406002][ T5337] but task is already holding lock: [ 86.409075][ T5337] ffff888035802338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680 [ 86.412524][ T5337] [ 86.412524][ T5337] which lock already depends on the new lock. [ 86.412524][ T5337] [ 86.416892][ T5337] [ 86.416892][ T5337] the existing dependency chain (in reverse order) is: [ 86.420693][ T5337] [ 86.420693][ T5337] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 86.424940][ T5337] lock_acquire+0x120/0x360 [ 86.427452][ T5337] __mutex_lock+0x182/0xe80 [ 86.429573][ T5337] l2cap_info_timeout+0x60/0xa0 [ 86.431734][ T5337] process_scheduled_works+0xae1/0x17b0 [ 86.434359][ T5337] worker_thread+0x8a0/0xda0 [ 86.436509][ T5337] kthread+0x70e/0x8a0 [ 86.438460][ T5337] ret_from_fork+0x3fc/0x770 [ 86.440801][ T5337] ret_from_fork_asm+0x1a/0x30 [ 86.443542][ T5337] [ 86.443542][ T5337] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 86.448689][ T5337] validate_chain+0xb9b/0x2140 [ 86.450853][ T5337] __lock_acquire+0xab9/0xd20 [ 86.452985][ T5337] lock_acquire+0x120/0x360 [ 86.455118][ T5337] __flush_work+0x6b8/0xbc0 [ 86.457217][ T5337] __cancel_work_sync+0xbe/0x110 [ 86.459425][ T5337] l2cap_conn_del+0x4f0/0x680 [ 86.461827][ T5337] hci_conn_hash_flush+0x10d/0x230 [ 86.464751][ T5337] hci_dev_close_sync+0xaef/0x1330 [ 86.467626][ T5337] hci_dev_close+0x106/0x200 [ 86.470227][ T5337] sock_do_ioctl+0xdc/0x300 [ 86.472578][ T5337] sock_ioctl+0x576/0x790 [ 86.474613][ T5337] __se_sys_ioctl+0xf9/0x170 [ 86.476568][ T5337] do_syscall_64+0xfa/0x3b0 [ 86.478930][ T5337] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.482232][ T5337] [ 86.482232][ T5337] other info that might help us debug this: [ 86.482232][ T5337] [ 86.486845][ T5337] Possible unsafe locking scenario: [ 86.486845][ T5337] [ 86.489915][ T5337] CPU0 CPU1 [ 86.492248][ T5337] ---- ---- [ 86.494991][ T5337] lock(&conn->lock#2); [ 86.497122][ T5337] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.500933][ T5337] lock(&conn->lock#2); [ 86.503848][ T5337] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.506833][ T5337] [ 86.506833][ T5337] *** DEADLOCK *** [ 86.506833][ T5337] [ 86.510735][ T5337] 5 locks held by syz.0.0/5337: [ 86.512862][ T5337] #0: ffff8880357bcd80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0xfe/0x200 [ 86.517235][ T5337] #1: ffff8880357bc078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x66a/0x1330 [ 86.522354][ T5337] #2: ffffffff8f678228 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x230 [ 86.526760][ T5337] #3: ffff888035802338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680 [ 86.531004][ T5337] #4: ffffffff8e13ed60 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xd2/0xbc0 [ 86.535620][ T5337] [ 86.535620][ T5337] stack backtrace: [ 86.538078][ T5337] CPU: 0 UID: 0 PID: 5337 Comm: syz.0.0 Not tainted 6.16.0-rc1-syzkaller-00236-g8c6bc74c7f89 #0 PREEMPT(full) [ 86.538095][ T5337] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 86.538104][ T5337] Call Trace: [ 86.538112][ T5337] [ 86.538117][ T5337] dump_stack_lvl+0x189/0x250 [ 86.538136][ T5337] ? __pfx_dump_stack_lvl+0x10/0x10 [ 86.538153][ T5337] ? __pfx__printk+0x10/0x10 [ 86.538189][ T5337] ? print_lock_name+0xde/0x100 [ 86.538202][ T5337] print_circular_bug+0x2ee/0x310 [ 86.538219][ T5337] check_noncircular+0x134/0x160 [ 86.538232][ T5337] validate_chain+0xb9b/0x2140 [ 86.538245][ T5337] ? do_raw_spin_lock+0x121/0x290 [ 86.538260][ T5337] ? look_up_lock_class+0x74/0x170 [ 86.538274][ T5337] ? register_lock_class+0x51/0x320 [ 86.538287][ T5337] __lock_acquire+0xab9/0xd20 [ 86.538299][ T5337] ? __flush_work+0xd2/0xbc0 [ 86.538305][ T5337] lock_acquire+0x120/0x360 [ 86.538317][ T5337] ? __flush_work+0xd2/0xbc0 [ 86.538327][ T5337] ? _raw_spin_unlock_irq+0x23/0x50 [ 86.538346][ T5337] ? __flush_work+0xd2/0xbc0 [ 86.538357][ T5337] __flush_work+0x6b8/0xbc0 [ 86.538368][ T5337] ? __flush_work+0xd2/0xbc0 [ 86.538382][ T5337] ? __flush_work+0xd2/0xbc0 [ 86.538407][ T5337] ? __pfx___flush_work+0x10/0x10 [ 86.538419][ T5337] ? __pfx_wq_barrier_func+0x10/0x10 [ 86.538436][ T5337] ? __pfx___cancel_work+0x10/0x10 [ 86.538444][ T5337] ? hci_conn_drop+0x14d/0x280 [ 86.538458][ T5337] __cancel_work_sync+0xbe/0x110 [ 86.538467][ T5337] l2cap_conn_del+0x4f0/0x680 [ 86.538479][ T5337] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 86.538490][ T5337] hci_conn_hash_flush+0x10d/0x230 [ 86.538505][ T5337] hci_dev_close_sync+0xaef/0x1330 [ 86.538517][ T5337] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 86.538533][ T5337] hci_dev_close+0x106/0x200 [ 86.538549][ T5337] sock_do_ioctl+0xdc/0x300 [ 86.538566][ T5337] ? __pfx_sock_do_ioctl+0x10/0x10 [ 86.538585][ T5337] ? __lock_acquire+0xab9/0xd20 [ 86.538607][ T5337] sock_ioctl+0x576/0x790 [ 86.538625][ T5337] ? __pfx_sock_ioctl+0x10/0x10 [ 86.538639][ T5337] ? __fget_files+0x2a/0x420 [ 86.538675][ T5337] ? __fget_files+0x3a0/0x420 [ 86.538687][ T5337] ? __fget_files+0x2a/0x420 [ 86.538700][ T5337] ? bpf_lsm_file_ioctl+0x9/0x20 [ 86.538748][ T5337] ? __pfx_sock_ioctl+0x10/0x10 [ 86.538760][ T5337] __se_sys_ioctl+0xf9/0x170 [ 86.538774][ T5337] do_syscall_64+0xfa/0x3b0 [ 86.538784][ T5337] ? lockdep_hardirqs_on+0x9c/0x150 [ 86.538800][ T5337] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.538812][ T5337] ? clear_bhb_loop+0x60/0xb0 [ 86.538823][ T5337] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.538834][ T5337] RIP: 0033:0x7f254818e929 [ 86.538847][ T5337] 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 [ 86.538857][ T5337] RSP: 002b:00007f2548fa8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 86.538870][ T5337] RAX: ffffffffffffffda RBX: 00007f25483b5fa0 RCX: 00007f254818e929 [ 86.538878][ T5337] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000005 [ 86.538884][ T5337] RBP: 00007f2548210b39 R08: 0000000000000000 R09: 0000000000000000 [ 86.538888][ T5337] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 86.538892][ T5337] R13: 0000000000000000 R14: 00007f25483b5fa0 R15: 00007ffd0246a6e8 [ 86.538899][ T5337] [ 86.694704][ T5341] fido_id[5341]: Failed to open report descriptor at '/sys/devices/virtual/bluetooth/hci0/hci0:200/report_descriptor': No such file or directory [ 88.142987][ T5312] Bluetooth: hci0: command tx timeout [ 90.224131][ T5312] Bluetooth: hci0: command tx timeout [ 91.746857][ T10] cfg80211: failed to load regulatory.db [ 92.303036][ T5312] Bluetooth: hci0: command tx timeout