program: r0 = syz_open_dev$tty1(0xc, 0x4, 0x1) ioctl$KDSETLED(r0, 0x4b32, 0x6) r1 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0) connect$bt_l2cap(r1, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x7ff}, 0xe) r2 = syz_init_net_socket$bt_hidp(0x1f, 0x3, 0x6) ioctl$sock_bt_hidp_HIDPCONNADD(r2, 0x400448c8, &(0x7f00000000c0)={r1, r1, 0x206, 0x0, 0x0, 0x2, 0x72, 0x1, 0x3, 0x7, 0x0, 0x8, 'syz1\x00'}) r3 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$HCIINQUIRY(r3, 0x400448ca, 0x0) r4 = socket$nl_generic(0x10, 0x3, 0x10) r5 = syz_genetlink_get_family_id$nl80211(&(0x7f0000000200), 0xffffffffffffffff) ioctl$sock_SIOCGIFINDEX_80211(r4, 0x8933, &(0x7f0000000700)={'wlan1\x00', 0x0}) sendmsg$NL80211_CMD_SET_INTERFACE(r4, &(0x7f0000000340)={0x0, 0x0, &(0x7f0000000300)={&(0x7f0000000000)=ANY=[@ANYBLOB='$\x00\x00\x00', @ANYRES16=r5, @ANYBLOB="050000000000000000000600000008000300", @ANYRES32=r6, @ANYBLOB="0800050002"], 0x24}}, 0x0) r7 = socket$nl_generic(0x10, 0x3, 0x10) r8 = syz_genetlink_get_family_id$nl80211(&(0x7f0000000080), 0xffffffffffffffff) ioctl$sock_SIOCGIFINDEX_80211(r7, 0x8933, &(0x7f00000000c0)={'wlan1\x00', 0x0}) sendmsg$NL80211_CMD_CONNECT(r7, &(0x7f00000001c0)={0x0, 0x0, &(0x7f0000000200)={&(0x7f0000000180)={0x38, r8, 0x5, 0x0, 0x25dfdbfb, {{}, {@val={0x8, 0x3, r9}, @void}}, [@NL80211_ATTR_SSID={0xa, 0x34, @default_ap_ssid}, @chandef_params=[@NL80211_ATTR_WIPHY_FREQ={0x8}], @NL80211_ATTR_USE_MFP={0x8, 0x42, 0x1}]}, 0x38}}, 0x0) syz_80211_inject_frame(&(0x7f00000002c0)=@device_b, &(0x7f0000000300)=@mgmt_frame=@probe_response={{{}, {}, @device_b, @device_a, @from_mac}, 0x0, @default, 0x1, @val={0x0, 0x6, @default_ap_ssid}, @val={0x1, 0x1, [{0x2, 0x1}]}, @void, @void, @void, @void, @void, @void}, 0x2f) nanosleep(&(0x7f0000000340)={0x0, 0x2faf080}, 0x0) syz_80211_inject_frame(&(0x7f00000003c0)=@device_b, &(0x7f0000000540)=ANY=[@ANYBLOB="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"], 0x1e) syz_80211_inject_frame(&(0x7f00000004c0)=@device_b, &(0x7f0000000380)=@mgmt_frame=@assoc_resp={{{}, {}, @device_b, @device_a, @from_mac, {0x0, 0x2}}, 0x1, 0x0, @default, @val, @void}, 0x20) syz_80211_inject_frame(&(0x7f0000000300)=@device_b, &(0x7f0000000400)=ANY=[@ANYBLOB="d0187f00ffffffffffff08021100000050505050505020000b"], 0x2f) r10 = socket$nl_route(0x10, 0x3, 0x0) sendmsg$nl_route(r10, &(0x7f0000000080)={0x0, 0x0, &(0x7f0000000500)={&(0x7f00000002c0)=@newlink={0x38, 0x10, 0x439, 0x0, 0x0, {}, [@IFLA_LINKINFO={0x18, 0x12, 0x0, 0x1, @ipip6={{0xb}, {0x8, 0x2, 0x0, 0x1, [@IFLA_IPTUN_COLLECT_METADATA={0x4}]}}}]}, 0x38}}, 0x0) syz_emit_ethernet(0x76, &(0x7f0000000140)={@multicast, @remote, @void, {@ipv6={0x86dd, @icmpv6={0x0, 0x6, "122d92", 0x40, 0x3a, 0xff, @remote, @mcast2, {[], @time_exceed={0x3, 0x1, 0x0, 0x0, '\x00', {0x9, 0x6, 'EAC', 0x8000, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01', @private2, [@hopopts={0x89}], "98efd03a7e60b623"}}}}}}}, 0x0) [ 85.716024][ T4682] Bluetooth: hci0: command tx timeout [ 85.830784][ T5344] input: Bluetooth HID Boot Protocol Device as /devices/virtual/bluetooth/hci0/hci0:200/input5 [ 85.974612][ T5344] [ 85.975652][ T5344] ====================================================== [ 85.978737][ T5344] WARNING: possible circular locking dependency detected [ 85.981950][ T5344] syzkaller #0 Not tainted [ 85.983812][ T5344] ------------------------------------------------------ [ 85.986606][ T5344] syz.0.0/5344 is trying to acquire lock: [ 85.989037][ T5344] ffff88801185d840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0xd2/0xbc0 [ 85.994007][ T5344] [ 85.994007][ T5344] but task is already holding lock: [ 85.997140][ T5344] ffff88801185db38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 86.000904][ T5344] [ 86.000904][ T5344] which lock already depends on the new lock. [ 86.000904][ T5344] [ 86.005466][ T5344] [ 86.005466][ T5344] the existing dependency chain (in reverse order) is: [ 86.009217][ T5344] [ 86.009217][ T5344] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 86.012418][ T5344] __mutex_lock+0x187/0x1350 [ 86.014656][ T5344] l2cap_info_timeout+0x60/0xa0 [ 86.016888][ T5344] process_scheduled_works+0xad1/0x1770 [ 86.019060][ T5344] worker_thread+0x8a0/0xda0 [ 86.021009][ T5344] kthread+0x711/0x8a0 [ 86.022694][ T5344] ret_from_fork+0x510/0xa50 [ 86.024736][ T5344] ret_from_fork_asm+0x1a/0x30 [ 86.026654][ T5344] [ 86.026654][ T5344] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 86.030603][ T5344] __lock_acquire+0x15a6/0x2cf0 [ 86.032819][ T5344] lock_acquire+0x107/0x340 [ 86.034881][ T5344] __flush_work+0x6b8/0xbc0 [ 86.037093][ T5344] __cancel_work_sync+0xbe/0x110 [ 86.039490][ T5344] l2cap_conn_del+0x402/0x5b0 [ 86.041711][ T5344] hci_conn_hash_flush+0x10d/0x260 [ 86.044536][ T5344] hci_dev_close_sync+0x821/0x1100 [ 86.047123][ T5344] hci_dev_close+0x108/0x270 [ 86.049331][ T5344] sock_do_ioctl+0xdc/0x300 [ 86.051505][ T5344] sock_ioctl+0x576/0x790 [ 86.053563][ T5344] __se_sys_ioctl+0xfc/0x170 [ 86.055792][ T5344] do_syscall_64+0xec/0xf80 [ 86.058099][ T5344] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.060834][ T5344] [ 86.060834][ T5344] other info that might help us debug this: [ 86.060834][ T5344] [ 86.065089][ T5344] Possible unsafe locking scenario: [ 86.065089][ T5344] [ 86.068215][ T5344] CPU0 CPU1 [ 86.070524][ T5344] ---- ---- [ 86.072827][ T5344] lock(&conn->lock#2); [ 86.074684][ T5344] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.078775][ T5344] lock(&conn->lock#2); [ 86.081680][ T5344] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.084844][ T5344] [ 86.084844][ T5344] *** DEADLOCK *** [ 86.084844][ T5344] [ 86.088547][ T5344] 5 locks held by syz.0.0/5344: [ 86.090718][ T5344] #0: ffff88801a12cec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x270 [ 86.094791][ T5344] #1: ffff88801a12c0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x1100 [ 86.099084][ T5344] #2: ffffffff8f485c88 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 [ 86.103373][ T5344] #3: ffff88801185db38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 86.107546][ T5344] #4: ffffffff8df41aa0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xd2/0xbc0 [ 86.111500][ T5344] [ 86.111500][ T5344] stack backtrace: [ 86.114130][ T5344] CPU: 0 UID: 0 PID: 5344 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 86.114147][ T5344] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 86.114154][ T5344] Call Trace: [ 86.114161][ T5344] [ 86.114168][ T5344] dump_stack_lvl+0xe8/0x150 [ 86.114187][ T5344] print_circular_bug+0x2e2/0x300 [ 86.114203][ T5344] check_noncircular+0x12e/0x150 [ 86.114219][ T5344] __lock_acquire+0x15a6/0x2cf0 [ 86.114230][ T5344] ? do_raw_spin_lock+0x121/0x290 [ 86.114244][ T5344] ? __flush_work+0xd2/0xbc0 [ 86.114256][ T5344] lock_acquire+0x107/0x340 [ 86.114266][ T5344] ? __flush_work+0xd2/0xbc0 [ 86.114280][ T5344] ? __flush_work+0xd2/0xbc0 [ 86.114292][ T5344] __flush_work+0x6b8/0xbc0 [ 86.114304][ T5344] ? __flush_work+0xd2/0xbc0 [ 86.114317][ T5344] ? __flush_work+0xd2/0xbc0 [ 86.114330][ T5344] ? __pfx___flush_work+0x10/0x10 [ 86.114343][ T5344] ? __pfx_wq_barrier_func+0x10/0x10 [ 86.114359][ T5344] ? __cancel_work_sync+0x5c/0x110 [ 86.114372][ T5344] __cancel_work_sync+0xbe/0x110 [ 86.114386][ T5344] l2cap_conn_del+0x402/0x5b0 [ 86.114403][ T5344] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 86.114418][ T5344] hci_conn_hash_flush+0x10d/0x260 [ 86.114436][ T5344] hci_dev_close_sync+0x821/0x1100 [ 86.114452][ T5344] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 86.114465][ T5344] ? lockdep_hardirqs_on+0x7b/0x110 [ 86.114475][ T5344] ? enable_work+0x1e9/0x220 [ 86.114491][ T5344] hci_dev_close+0x108/0x270 [ 86.114507][ T5344] sock_do_ioctl+0xdc/0x300 [ 86.114522][ T5344] ? __pfx_sock_do_ioctl+0x10/0x10 [ 86.114533][ T5344] ? do_futex+0x395/0x420 [ 86.114543][ T5344] ? call_rcu+0x644/0x890 [ 86.114558][ T5344] sock_ioctl+0x576/0x790 [ 86.114571][ T5344] ? __pfx_sock_ioctl+0x10/0x10 [ 86.114584][ T5344] ? __fget_files+0x2a/0x420 [ 86.114595][ T5344] ? __fget_files+0x3a0/0x420 [ 86.114606][ T5344] ? __fget_files+0x2a/0x420 [ 86.114618][ T5344] ? bpf_lsm_file_ioctl+0x9/0x20 [ 86.114635][ T5344] ? __pfx_sock_ioctl+0x10/0x10 [ 86.114647][ T5344] __se_sys_ioctl+0xfc/0x170 [ 86.114663][ T5344] do_syscall_64+0xec/0xf80 [ 86.114673][ T5344] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.114685][ T5344] ? trace_irq_disable+0x37/0x100 [ 86.114701][ T5344] ? clear_bhb_loop+0x60/0xb0 [ 86.114714][ T5344] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.114725][ T5344] RIP: 0033:0x7fc4b678f7c9 [ 86.114738][ 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 [ 86.114749][ T5344] RSP: 002b:00007fc4b7576038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 86.114764][ T5344] RAX: ffffffffffffffda RBX: 00007fc4b69e5fa0 RCX: 00007fc4b678f7c9 [ 86.114773][ T5344] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000007 [ 86.114780][ T5344] RBP: 00007fc4b6813f91 R08: 0000000000000000 R09: 0000000000000000 [ 86.114788][ T5344] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 86.114795][ T5344] R13: 00007fc4b69e6038 R14: 00007fc4b69e5fa0 R15: 00007ffd46a8cbe8 [ 86.114808][ T5344] [ 86.284476][ T5345] mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium [ 86.321358][ T5342] wlan1: authenticate with 08:02:11:00:00:00 (local address=08:02:11:00:00:01) [ 86.326322][ T5342] wlan1: send auth to 08:02:11:00:00:00 (try 1/3) [ 86.340965][ T1076] wlan1: authenticated [ 86.343335][ T5345] mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium [ 86.348708][ T1076] wlan1: RX AssocResp from 08:02:11:00:00:00 (capab=0x1 status=0 aid=1) [ 86.352847][ T1076] wlan1: associated [ 86.354887][ T5345] mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium [ 86.359634][ T5345] mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium [ 87.770666][ T4682] Bluetooth: hci0: command tx timeout [ 89.851479][ T4682] Bluetooth: hci0: command tx timeout [ 91.696222][ T1360] cfg80211: failed to load regulatory.db [ 91.930546][ T4682] Bluetooth: hci0: command tx timeout