program: r0 = socket$nl_generic(0x10, 0x3, 0x10) r1 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r1, &(0x7f00000000c0)={0x0, 0x0, &(0x7f0000000040)={&(0x7f0000000200)=ANY=[@ANYBLOB="140000001000010000000000000000000000000a20000000000a010300000000000000000100fffd0900010073797a300000000040000000030a01020000000000000000010000000900030073797a3200000000140004800800024032658aeb08000140000000010900010073797a300000000044000000060a010400000000000001040100000008000b40000000000900010073797a30000000001c000480180001800d00010073796e70726f7879000000000400028014000000110001"], 0xcc}}, 0x0) syz_emit_ethernet(0x66, &(0x7f0000000000)={@multicast, @dev, @void, {@ipv6={0x86dd, @icmpv6={0x0, 0x6, "010020", 0x30, 0x3a, 0xff, @dev, @mcast2, {[], @ndisc_redir={0x89, 0x0, 0x0, '\x00', @empty, @empty, [{0x2, 0x1, "824780cdace0"}]}}}}}}, 0x0) syz_genetlink_get_family_id$nl80211(&(0x7f0000000280), r0) r2 = socket$nl_generic(0x10, 0x3, 0x10) r3 = syz_genetlink_get_family_id$nl80211(&(0x7f0000000200), 0xffffffffffffffff) 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, &(0x7f0000000180)={r4, r4, 0x8, 0x0, 0x0, 0x82, 0x4a, 0x15c2, 0x5886, 0x6, 0x0, 0x8, 'syz1\x00'}) r6 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$sock_bt_hci(r6, 0x400448ca, 0x0) ioctl$sock_SIOCGIFINDEX_80211(r2, 0x8933, &(0x7f0000000700)={'wlan1\x00', 0x0}) r8 = openat$comedi(0xffffff9c, &(0x7f0000000040)='/dev/comedi1\x00', 0x2180, 0x0) ioctl$COMEDI_DEVCONFIG(r8, 0x40946400, &(0x7f0000000300)={'comedi_parport\x00', [0x2f00, 0x5, 0xd09a, 0xffffffff, 0x3, 0xfffffffe, 0x20000004, 0x3, 0xffe, 0x7fffffff, 0xc, 0x2, 0x4, 0x8, 0xffff, 0x6, 0x5, 0x7ff, 0x830, 0x8, 0x10000, 0x9, 0x800, 0x101, 0x2, 0x8001, 0x7, 0x3, 0x4, 0x5, 0x70f]}) ioctl$COMEDI_INSN(r8, 0x8028640c, &(0x7f0000000000)={0x4000000, 0xf, &(0x7f0000000080)=[0x3, 0xfff, 0x4, 0xb, 0x663, 0x4, 0xe0, 0xfffffff7, 0x9, 0xf6, 0xffffffff, 0x2, 0x200, 0x4, 0x6], 0x3}) sendmsg$NL80211_CMD_SET_INTERFACE(r2, &(0x7f0000000340)={0x0, 0x0, &(0x7f0000000300)={&(0x7f0000000240)={0x24, r3, 0x5, 0x0, 0x0, {{}, {@val={0x8, 0x3, r7}, @void}}, [@NL80211_ATTR_IFTYPE={0x8, 0x5, 0x2}]}, 0x24}}, 0x0) r9 = io_uring_setup(0x3c92, &(0x7f0000000100)={0x0, 0x3, 0x0, 0xffffffff}) r10 = socket$vsock_stream(0x28, 0x1, 0x0) bind$vsock_stream(r10, &(0x7f0000000040)={0x28, 0x0, 0x2710, @local}, 0x10) listen(r10, 0x0) r11 = socket$vsock_stream(0x28, 0x1, 0x0) connect$vsock_stream(r11, &(0x7f0000000640)={0x28, 0x0, 0x2710}, 0x10) r12 = accept(r10, 0x0, 0x0) r13 = bpf$MAP_CREATE(0x0, &(0x7f0000000580)=ANY=[@ANYBLOB="120000000400000004000000a400000000000000", @ANYRES32, @ANYBLOB="0000000000000000000000000000000000000100", @ANYRES32=0x0, @ANYRES32, @ANYBLOB='\x00'/28], 0x48) bpf$MAP_UPDATE_ELEM(0x2, &(0x7f0000000140)={r13, &(0x7f0000000080), &(0x7f00000002c0)=@tcp=r12, 0x1}, 0x20) ioctl$int_in(r12, 0x5452, &(0x7f0000000000)=0x6) recvmsg$can_bcm(r12, &(0x7f00000003c0)={0x0, 0x0, 0x0}, 0x0) close_range(r9, 0xffffffffffffffff, 0x0) [ 86.621850][ T5319] Bluetooth: hci0: command tx timeout [ 86.804051][ T5340] input: Bluetooth HID Boot Protocol Device as /devices/virtual/bluetooth/hci0/hci0:200/input5 [ 86.991057][ T5341] [ 86.992291][ T5341] ====================================================== [ 86.995031][ T5341] WARNING: possible circular locking dependency detected [ 86.997671][ T5341] syzkaller #0 Not tainted [ 86.999461][ T5341] ------------------------------------------------------ [ 87.002298][ T5341] syz.0.0/5341 is trying to acquire lock: [ 87.004902][ T5341] ffff8880407be840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0xd2/0xbc0 [ 87.009989][ T5341] [ 87.009989][ T5341] but task is already holding lock: [ 87.013162][ T5341] ffff8880407beb38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 87.016956][ T5341] [ 87.016956][ T5341] which lock already depends on the new lock. [ 87.016956][ T5341] [ 87.021680][ T5341] [ 87.021680][ T5341] the existing dependency chain (in reverse order) is: [ 87.025212][ T5341] [ 87.025212][ T5341] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 87.028427][ T5341] __mutex_lock+0x187/0x1350 [ 87.030793][ T5341] l2cap_info_timeout+0x60/0xa0 [ 87.033119][ T5341] process_scheduled_works+0xad1/0x1770 [ 87.035570][ T5341] worker_thread+0x8a0/0xda0 [ 87.037699][ T5341] kthread+0x711/0x8a0 [ 87.039713][ T5341] ret_from_fork+0x599/0xb30 [ 87.042180][ T5341] ret_from_fork_asm+0x1a/0x30 [ 87.044595][ T5341] [ 87.044595][ T5341] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 87.049040][ T5341] __lock_acquire+0x15a6/0x2cf0 [ 87.051405][ T5341] lock_acquire+0x117/0x340 [ 87.053516][ T5341] __flush_work+0x6b8/0xbc0 [ 87.055720][ T5341] __cancel_work_sync+0xbe/0x110 [ 87.058100][ T5341] l2cap_conn_del+0x402/0x5b0 [ 87.060330][ T5341] hci_conn_hash_flush+0x10d/0x260 [ 87.062913][ T5341] hci_dev_close_sync+0x821/0x1100 [ 87.065590][ T5341] hci_dev_close+0x108/0x270 [ 87.067949][ T5341] sock_do_ioctl+0xdc/0x300 [ 87.070232][ T5341] sock_ioctl+0x576/0x790 [ 87.072468][ T5341] __se_sys_ioctl+0xfc/0x170 [ 87.074878][ T5341] do_syscall_64+0xfa/0xf80 [ 87.077058][ T5341] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.079786][ T5341] [ 87.079786][ T5341] other info that might help us debug this: [ 87.079786][ T5341] [ 87.083677][ T5341] Possible unsafe locking scenario: [ 87.083677][ T5341] [ 87.087092][ T5341] CPU0 CPU1 [ 87.089611][ T5341] ---- ---- [ 87.092079][ T5341] lock(&conn->lock#2); [ 87.093984][ T5341] lock((work_completion)(&(&conn->info_timer)->work)); [ 87.097692][ T5341] lock(&conn->lock#2); [ 87.100501][ T5341] lock((work_completion)(&(&conn->info_timer)->work)); [ 87.103413][ T5341] [ 87.103413][ T5341] *** DEADLOCK *** [ 87.103413][ T5341] [ 87.106940][ T5341] 5 locks held by syz.0.0/5341: [ 87.109105][ T5341] #0: ffff88803f860ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x270 [ 87.112965][ T5341] #1: ffff88803f8600c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x1100 [ 87.117083][ T5341] #2: ffffffff8f683488 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 [ 87.121072][ T5341] #3: ffff8880407beb38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 87.124637][ T5341] #4: ffffffff8e1419e0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xd2/0xbc0 [ 87.128478][ T5341] [ 87.128478][ T5341] stack backtrace: [ 87.131084][ T5341] CPU: 0 UID: 0 PID: 5341 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 87.131099][ T5341] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 87.131107][ T5341] Call Trace: [ 87.131115][ T5341] [ 87.131121][ T5341] dump_stack_lvl+0x189/0x250 [ 87.131139][ T5341] ? __pfx_dump_stack_lvl+0x10/0x10 [ 87.131152][ T5341] ? __pfx__printk+0x10/0x10 [ 87.131167][ T5341] ? print_lock_name+0xde/0x100 [ 87.131182][ T5341] print_circular_bug+0x2e2/0x300 [ 87.131196][ T5341] check_noncircular+0x12e/0x150 [ 87.131211][ T5341] __lock_acquire+0x15a6/0x2cf0 [ 87.131223][ T5341] ? do_raw_spin_unlock+0x4d/0x240 [ 87.131237][ T5341] ? _raw_spin_unlock_irqrestore+0xad/0x110 [ 87.131251][ T5341] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 87.131264][ T5341] ? __flush_work+0xd2/0xbc0 [ 87.131279][ T5341] lock_acquire+0x117/0x340 [ 87.131289][ T5341] ? __flush_work+0xd2/0xbc0 [ 87.131302][ T5341] ? _raw_spin_unlock_irq+0x23/0x50 [ 87.131315][ T5341] ? __flush_work+0xd2/0xbc0 [ 87.131326][ T5341] __flush_work+0x6b8/0xbc0 [ 87.131338][ T5341] ? __flush_work+0xd2/0xbc0 [ 87.131350][ T5341] ? __flush_work+0xd2/0xbc0 [ 87.131362][ T5341] ? __pfx___flush_work+0x10/0x10 [ 87.131374][ T5341] ? __pfx_wq_barrier_func+0x10/0x10 [ 87.131388][ T5341] ? __pfx___cancel_work+0x10/0x10 [ 87.131400][ T5341] ? hci_conn_drop+0x153/0x2b0 [ 87.131415][ T5341] ? __cancel_work_sync+0x5c/0x110 [ 87.131427][ T5341] __cancel_work_sync+0xbe/0x110 [ 87.131440][ T5341] l2cap_conn_del+0x402/0x5b0 [ 87.131454][ T5341] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 87.131465][ T5341] hci_conn_hash_flush+0x10d/0x260 [ 87.131480][ T5341] hci_dev_close_sync+0x821/0x1100 [ 87.131493][ T5341] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 87.131504][ T5341] ? __cancel_work_sync+0x5c/0x110 [ 87.131518][ T5341] hci_dev_close+0x108/0x270 [ 87.131530][ T5341] sock_do_ioctl+0xdc/0x300 [ 87.131543][ T5341] ? __pfx_sock_do_ioctl+0x10/0x10 [ 87.131553][ T5341] ? do_futex+0x333/0x420 [ 87.131568][ T5341] sock_ioctl+0x576/0x790 [ 87.131580][ T5341] ? __pfx_sock_ioctl+0x10/0x10 [ 87.131591][ T5341] ? __fget_files+0x3a0/0x420 [ 87.131602][ T5341] ? __fget_files+0x2a/0x420 [ 87.131614][ T5341] ? bpf_lsm_file_ioctl+0x9/0x20 [ 87.131626][ T5341] ? __pfx_sock_ioctl+0x10/0x10 [ 87.131636][ T5341] __se_sys_ioctl+0xfc/0x170 [ 87.131651][ T5341] do_syscall_64+0xfa/0xf80 [ 87.131665][ T5341] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.131676][ T5341] ? clear_bhb_loop+0x60/0xb0 [ 87.131687][ T5341] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.131698][ T5341] RIP: 0033:0x7f25dcf8f7c9 [ 87.131709][ T5341] 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 [ 87.131717][ T5341] RSP: 002b:00007f25dde5e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 87.131729][ T5341] RAX: ffffffffffffffda RBX: 00007f25dd1e6090 RCX: 00007f25dcf8f7c9 [ 87.131737][ T5341] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000009 [ 87.131744][ T5341] RBP: 00007f25dd013f91 R08: 0000000000000000 R09: 0000000000000000 [ 87.131750][ T5341] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 87.131756][ T5341] R13: 00007f25dd1e6128 R14: 00007f25dd1e6090 R15: 00007ffcda062f88 [ 87.131767][ T5341] [ 88.656171][ T5319] Bluetooth: hci0: command tx timeout [ 90.736740][ T5319] Bluetooth: hci0: command tx timeout [ 91.859376][ T10] cfg80211: failed to load regulatory.db [ 92.816274][ T5319] Bluetooth: hci0: command tx timeout