program: r0 = openat$userio(0xffffffffffffff9c, &(0x7f0000000080), 0x2a242, 0x0) write$USERIO_CMD_SET_PORT_TYPE(r0, &(0x7f00000002c0)={0x1, 0x5}, 0x2) write$USERIO_CMD_REGISTER(r0, &(0x7f00000000c0), 0x2) read(r0, &(0x7f00000001c0)=""/93, 0x5d) write$USERIO_CMD_SEND_INTERRUPT(r0, &(0x7f0000000440)={0x2, 0xfa}, 0x2) write$USERIO_CMD_SEND_INTERRUPT(r0, &(0x7f0000000100)={0x2, 0xda}, 0x2) sendmsg$NL80211_CMD_NEW_KEY(0xffffffffffffffff, &(0x7f00000006c0)={0x0, 0x0, &(0x7f0000000680)={&(0x7f0000000000)=ANY=[@ANYBLOB='X\x00\x00\x00', @ANYRES16, @ANYBLOB="010800000000000000000b00000008000300", @ANYRES32, @ANYBLOB="0a000600080211000800000000000000110001004abee33908f8eef16f16246df400000008000700000002"], 0x58}, 0x1, 0x0, 0x0, 0x40840}, 0x0) r1 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) r2 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0) close_range(r2, r0, 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$sock_bt_hidp_HIDPCONNADD(r3, 0x400448c8, &(0x7f0000000340)={r2, r2, 0x8, 0x1, &(0x7f0000000180)="e2", 0xb, 0x1, 0x16c0, 0x5df, 0x3, 0x0, 0x8, 'syz0\x00'}) ioctl$sock_bt_hci(r1, 0x400448cb, 0x0) openat$snapshot(0xffffffffffffff9c, &(0x7f00000002c0), 0x40040, 0x0) syz_emit_vhci(&(0x7f0000000040)=ANY=[@ANYBLOB="040e0402030c"], 0x7) [ 85.847740][ T4688] Bluetooth: hci0: command tx timeout [ 86.025299][ T4871] hid-generic 0005:16C0:05DF.0002: item fetching failed at offset 0/1 [ 86.045138][ T4871] hid-generic 0005:16C0:05DF.0002: probe with driver hid-generic failed with error -22 [ 86.096529][ T5343] [ 86.097767][ T5343] ====================================================== [ 86.101033][ T5343] WARNING: possible circular locking dependency detected [ 86.104281][ T5343] syzkaller #0 Not tainted [ 86.106389][ T5343] ------------------------------------------------------ [ 86.109653][ T5343] syz.0.0/5343 is trying to acquire lock: [ 86.112551][ T5343] ffff88803f013840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0xd2/0xbc0 [ 86.118466][ T5343] [ 86.118466][ T5343] but task is already holding lock: [ 86.121825][ T5343] ffff88803f013b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 86.125820][ T5343] [ 86.125820][ T5343] which lock already depends on the new lock. [ 86.125820][ T5343] [ 86.130884][ T5343] [ 86.130884][ T5343] the existing dependency chain (in reverse order) is: [ 86.135017][ T5343] [ 86.135017][ T5343] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 86.138478][ T5343] __mutex_lock+0x187/0x1350 [ 86.140783][ T5343] l2cap_info_timeout+0x60/0xa0 [ 86.143199][ T5343] process_scheduled_works+0xad1/0x1770 [ 86.145839][ T5343] worker_thread+0x8a0/0xda0 [ 86.148215][ T5343] kthread+0x711/0x8a0 [ 86.150278][ T5343] ret_from_fork+0x599/0xb30 [ 86.152501][ T5343] ret_from_fork_asm+0x1a/0x30 [ 86.154874][ T5343] [ 86.154874][ T5343] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 86.159361][ T5343] __lock_acquire+0x15a6/0x2cf0 [ 86.161782][ T5343] lock_acquire+0x117/0x340 [ 86.164071][ T5343] __flush_work+0x6b8/0xbc0 [ 86.166319][ T5343] __cancel_work_sync+0xbe/0x110 [ 86.168795][ T5343] l2cap_conn_del+0x402/0x5b0 [ 86.171206][ T5343] hci_conn_hash_flush+0x10d/0x260 [ 86.173757][ T5343] hci_dev_reset+0x41c/0x6e0 [ 86.176082][ T5343] sock_do_ioctl+0xdc/0x300 [ 86.178416][ T5343] sock_ioctl+0x576/0x790 [ 86.180724][ T5343] __se_sys_ioctl+0xfc/0x170 [ 86.183231][ T5343] do_syscall_64+0xfa/0xf80 [ 86.185576][ T5343] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.188404][ T5343] [ 86.188404][ T5343] other info that might help us debug this: [ 86.188404][ T5343] [ 86.192736][ T5343] Possible unsafe locking scenario: [ 86.192736][ T5343] [ 86.196098][ T5343] CPU0 CPU1 [ 86.198435][ T5343] ---- ---- [ 86.200841][ T5343] lock(&conn->lock#2); [ 86.202769][ T5343] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.207105][ T5343] lock(&conn->lock#2); [ 86.210205][ T5343] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.213430][ T5343] [ 86.213430][ T5343] *** DEADLOCK *** [ 86.213430][ T5343] [ 86.217147][ T5343] 6 locks held by syz.0.0/5343: [ 86.219436][ T5343] #0: ffff888040ee4028 (&hdev->srcu){.+.+}-{0:0}, at: __hci_dev_get+0x103/0x280 [ 86.223602][ T5343] #1: ffff888040ee4ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_reset+0x153/0x6e0 [ 86.227787][ T5343] #2: ffff888040ee40c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_reset+0x1e9/0x6e0 [ 86.231786][ T5343] #3: ffffffff8f683488 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 [ 86.236360][ T5343] #4: ffff88803f013b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 86.240473][ T5343] #5: ffffffff8e1419e0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xd2/0xbc0 [ 86.244591][ T5343] [ 86.244591][ T5343] stack backtrace: [ 86.247325][ T5343] CPU: 0 UID: 0 PID: 5343 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 86.247342][ T5343] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 86.247351][ T5343] Call Trace: [ 86.247358][ T5343] [ 86.247364][ T5343] dump_stack_lvl+0x189/0x250 [ 86.247383][ T5343] ? __pfx_dump_stack_lvl+0x10/0x10 [ 86.247395][ T5343] ? __pfx__printk+0x10/0x10 [ 86.247411][ T5343] ? print_lock_name+0xde/0x100 [ 86.247428][ T5343] print_circular_bug+0x2e2/0x300 [ 86.247442][ T5343] check_noncircular+0x12e/0x150 [ 86.247456][ T5343] __lock_acquire+0x15a6/0x2cf0 [ 86.247469][ T5343] ? do_raw_spin_unlock+0x4d/0x240 [ 86.247483][ T5343] ? _raw_spin_unlock_irqrestore+0xad/0x110 [ 86.247499][ T5343] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 86.247515][ T5343] ? __flush_work+0xd2/0xbc0 [ 86.247528][ T5343] lock_acquire+0x117/0x340 [ 86.247539][ T5343] ? __flush_work+0xd2/0xbc0 [ 86.247553][ T5343] ? _raw_spin_unlock_irq+0x23/0x50 [ 86.247567][ T5343] ? __flush_work+0xd2/0xbc0 [ 86.247580][ T5343] __flush_work+0x6b8/0xbc0 [ 86.247596][ T5343] ? __flush_work+0xd2/0xbc0 [ 86.247609][ T5343] ? __flush_work+0xd2/0xbc0 [ 86.247623][ T5343] ? __pfx___flush_work+0x10/0x10 [ 86.247636][ T5343] ? __pfx_wq_barrier_func+0x10/0x10 [ 86.247651][ T5343] ? __pfx___cancel_work+0x10/0x10 [ 86.247666][ T5343] ? hci_conn_drop+0x153/0x2b0 [ 86.247681][ T5343] ? __cancel_work_sync+0x5c/0x110 [ 86.247695][ T5343] __cancel_work_sync+0xbe/0x110 [ 86.247709][ T5343] l2cap_conn_del+0x402/0x5b0 [ 86.247722][ T5343] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 86.247737][ T5343] hci_conn_hash_flush+0x10d/0x260 [ 86.247754][ T5343] hci_dev_reset+0x41c/0x6e0 [ 86.247791][ T5343] ? hci_sock_ioctl+0x5b7/0x940 [ 86.247808][ T5343] sock_do_ioctl+0xdc/0x300 [ 86.247823][ T5343] ? __pfx_sock_do_ioctl+0x10/0x10 [ 86.247835][ T5343] ? do_futex+0x395/0x420 [ 86.247851][ T5343] sock_ioctl+0x576/0x790 [ 86.247864][ T5343] ? __pfx_sock_ioctl+0x10/0x10 [ 86.247876][ T5343] ? __fget_files+0x3a0/0x420 [ 86.247889][ T5343] ? __fget_files+0x2a/0x420 [ 86.247902][ T5343] ? bpf_lsm_file_ioctl+0x9/0x20 [ 86.247914][ T5343] ? __pfx_sock_ioctl+0x10/0x10 [ 86.247927][ T5343] __se_sys_ioctl+0xfc/0x170 [ 86.247944][ T5343] do_syscall_64+0xfa/0xf80 [ 86.247963][ T5343] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.247974][ T5343] ? clear_bhb_loop+0x60/0xb0 [ 86.247988][ T5343] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.248000][ T5343] RIP: 0033:0x7fc8c1d8f7c9 [ 86.248013][ T5343] 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 [ 86.248023][ T5343] RSP: 002b:00007fc8c2c92038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 86.248036][ T5343] RAX: ffffffffffffffda RBX: 00007fc8c1fe5fa0 RCX: 00007fc8c1d8f7c9 [ 86.248044][ T5343] RDX: 0000000000000000 RSI: 00000000400448cb RDI: 0000000000000005 [ 86.248051][ T5343] RBP: 00007fc8c1e13f91 R08: 0000000000000000 R09: 0000000000000000 [ 86.248058][ T5343] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 86.248064][ T5343] R13: 00007fc8c1fe6038 R14: 00007fc8c1fe5fa0 R15: 00007fff0ce36838 [ 86.248075][ T5343] [ 91.907164][ T785] cfg80211: failed to load regulatory.db