program: bpf$PROG_LOAD_XDP(0x5, &(0x7f00000001c0)={0xd, 0x3, &(0x7f0000001300)=@framed={{0x18, 0x0, 0x0, 0x0, 0x1}}, &(0x7f0000000040)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, 0x9}, 0x94) r0 = syz_open_dev$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$HCIINQUIRY(r3, 0x400448ca, 0x0) r4 = fsopen(&(0x7f00000003c0)='cgroup2\x00', 0x0) fsconfig$FSCONFIG_CMD_CREATE(r4, 0x6, 0x0, 0x0, 0x0) r5 = fsmount(r4, 0x0, 0x0) r6 = socket$nl_xfrm(0x10, 0x3, 0x6) sendmsg$nl_xfrm(r6, &(0x7f0000000480)={0x0, 0x0, &(0x7f0000001f40)={&(0x7f00000004c0)=ANY=[@ANYBLOB="fc00000019000100000000000000000020010000000000020000000000000000ac1414aa00000000000000000000000000000000000000000a00000000000000", @ANYRES32=0x0, @ANYRES8=r1, @ANYBLOB="0000000000000000a9000000000000000000000000000000000000000000000000000000000000ffffffffffffffff000000000000000000000000000000000000000000000000000a000000000000000000000080400000000000000000000000000000000000000000000000000044000500ac1414aa000000000000000000000000000000006c00000000000000ffffffff00000000000000000000000000000000000300"/180], 0xfc}}, 0x20020014) socket$nl_xfrm(0x10, 0x3, 0x6) sendmsg$nl_xfrm(0xffffffffffffffff, &(0x7f0000000380)={0x0, 0x0, &(0x7f0000000000)={&(0x7f00000005c0)=@migrate={0xcc, 0x21, 0x200, 0x0, 0x0, {{@in6=@private2, @in6=@loopback, 0x0, 0x0, 0x0, 0x0, 0xa}, 0x6e6bb2}, [@migrate={0x50, 0x11, [{@in=@private=0xa010101, @in=@local, @in=@private=0xa010100, @in=@broadcast, 0x3c, 0x0, 0x0, 0x3504, 0xa, 0xa}]}, @user_kmaddress={0x2c, 0x13, {@in6=@mcast2, @in=@multicast1, 0x0, 0x2}}]}, 0xcc}, 0x1, 0x0, 0x0, 0x8c7}, 0x0) keyctl$set_reqkey_keyring(0xe, 0x4) request_key(&(0x7f0000000000)='asymmetric\x00', &(0x7f00000001c0)={'syz', 0x2}, &(0x7f0000000380)='\x00\xb2\xd1)\xda\xff|\xd1\x85b\xad77\x00\fJ\xfc\xb4\x1e\xae\xe8:`\xe9\x9ew\xf5l\xee\x8dg\xc2\'\x88\xe9\xf3\x05\xe02\xe6\v_\xe9\x89\x86s\x8dh#%\xe4\xb1\xd0\x93\xceh\xfcsP)\xd9\xce5+?\xc6\xf7\xc0[G\x15\xde-x\xa9\xe5,\xec\xf6\xfb\xc9~2\xa1\xeb\xb3Pp\x93\x90\x17\xb2\x95\xe7\r\xae^\x92n\xbd\xf3\xb1\xac\xe3sf\xc9X\x05j:\xb6~\xa6#\xbf\x06t\xf2\xb5gd\xd7\xcc\"A_\xecu\xe8\x84\xe3\x92J\xaa!\xae\xa2\xd7\xf3\xc6J\xb9i\x9d\xb4{\xee\xf0|\xd9\x05\xaa\xbb\xfe\x12\xa0\xbb\xecY\x0f \xa3\xba?#\x90\x8c,nNQ\xa1\xed', 0x0) r7 = socket$inet6_tcp(0xa, 0x1, 0x0) bind$inet6(r7, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c) listen(r7, 0x0) syz_emit_ethernet(0x103, &(0x7f0000000740)={@local, @multicast, @void, {@ipv6={0x86dd, @dccp_packet={0xf, 0x6, "d9db92", 0xcd, 0x21, 0x1, @remote, @remote, {[@fragment={0x2c, 0x0, 0x6, 0x1, 0x0, 0x9, 0x68}, @routing={0x89, 0x2, 0x0, 0x2, 0x0, [@initdev={0xfe, 0x88, '\x00', 0x1, 0x0}]}, @fragment={0x3c, 0x0, 0x3, 0x1, 0x0, 0xe, 0x65}, @routing={0x3a, 0x4, 0x0, 0x8, 0x0, [@private1, @loopback]}, @fragment={0x87, 0x0, 0x6, 0x0, 0x0, 0xb, 0x65}, @srh={0x2, 0x4, 0x4, 0x2, 0x7, 0x70, 0x0, [@mcast2, @remote]}], {{0x4e24, 0x4e20, 0x4, 0x1, 0x4, 0x0, 0x0, 0x0, 0x7, "0400b3", 0x5, "2e3d18"}, "5e0dbeca5ae3851c3c4e48846cb470fac42ae7fa6ccca5f44bb5d29afd626ff3702c48fd2740f998c77537976ca746095191f01de3d3edff7ac0d4b9a6"}}}}}}, 0x0) syz_emit_ethernet(0x4a, &(0x7f0000000b80)={@local, @remote, @void, {@ipv6={0x86dd, @tcp={0x0, 0x6, "560400", 0x14, 0x6, 0x0, @local, @ipv4={'\x00', '\xff\xff', @empty}, {[], {{0x0, 0x4e22, 0x41424344, 0x41424344, 0x0, 0x0, 0x5, 0xc2, 0x0, 0x0, 0x4}}}}}}}, 0x0) socket$inet_smc(0x2b, 0x1, 0x0) r8 = syz_genetlink_get_family_id$mptcp(&(0x7f00000000c0), r5) r9 = socket$inet6_icmp_raw(0xa, 0x3, 0x3a) ioctl$sock_SIOCBRDELBR(r9, 0x89a1, &(0x7f0000000100)='veth0_to_bridge\x00') socket$inet6_sctp(0xa, 0x1, 0x84) keyctl$set_reqkey_keyring(0xe, 0xffffffffffffffff) sendmsg$MPTCP_PM_CMD_DEL_ADDR(r5, &(0x7f0000000280)={&(0x7f0000000080)={0x10, 0x0, 0x0, 0x8000000}, 0xc, &(0x7f0000000180)={&(0x7f0000000140)={0x30, r8, 0x400, 0x70bd27, 0x25dfdbfc, {}, [@MPTCP_PM_ATTR_SUBFLOWS={0x8, 0x3, 0x8}, @MPTCP_PM_ATTR_ADDR={0x14, 0x1, 0x0, 0x1, [@MPTCP_PM_ADDR_ATTR_FAMILY={0x6, 0x1, 0xa}, @MPTCP_PM_ADDR_ATTR_FLAGS={0x8, 0x6, 0x5}]}]}, 0x30}, 0x1, 0x0, 0x0, 0x4}, 0x8000) [ 85.987954][ T5344] input: Bluetooth HID Boot Protocol Device as /devices/virtual/bluetooth/hci0/hci0:200/input5 [ 86.095324][ T5344] netlink: 68 bytes leftover after parsing attributes in process `syz.0.0'. [ 86.144752][ T5345] [ 86.145926][ T5345] ====================================================== [ 86.148929][ T5345] WARNING: possible circular locking dependency detected [ 86.151997][ T5345] syzkaller #0 Not tainted [ 86.153998][ T5345] ------------------------------------------------------ [ 86.157105][ T5345] syz.0.0/5345 is trying to acquire lock: [ 86.159683][ T5345] ffff888040d81840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0xd2/0xbc0 [ 86.164944][ T5345] [ 86.164944][ T5345] but task is already holding lock: [ 86.168097][ T5345] ffff888040d81b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 86.171984][ T5345] [ 86.171984][ T5345] which lock already depends on the new lock. [ 86.171984][ T5345] [ 86.176294][ T5345] [ 86.176294][ T5345] the existing dependency chain (in reverse order) is: [ 86.180104][ T5345] [ 86.180104][ T5345] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 86.183341][ T5345] __mutex_lock+0x187/0x1350 [ 86.185671][ T5345] l2cap_info_timeout+0x60/0xa0 [ 86.188057][ T5345] process_scheduled_works+0xad1/0x1770 [ 86.190723][ T5345] worker_thread+0x8a0/0xda0 [ 86.192995][ T5345] kthread+0x711/0x8a0 [ 86.195093][ T5345] ret_from_fork+0x510/0xa50 [ 86.197363][ T5345] ret_from_fork_asm+0x1a/0x30 [ 86.199739][ T5345] [ 86.199739][ T5345] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 86.204303][ T5345] __lock_acquire+0x15a6/0x2cf0 [ 86.206713][ T5345] lock_acquire+0x107/0x340 [ 86.208986][ T5345] __flush_work+0x6b8/0xbc0 [ 86.211248][ T5345] __cancel_work_sync+0xbe/0x110 [ 86.213711][ T5345] l2cap_conn_del+0x402/0x5b0 [ 86.216058][ T5345] hci_conn_hash_flush+0x10d/0x260 [ 86.218607][ T5345] hci_dev_close_sync+0x821/0x1100 [ 86.221158][ T5345] hci_dev_close+0x108/0x270 [ 86.223485][ T5345] sock_do_ioctl+0xdc/0x300 [ 86.225749][ T5345] sock_ioctl+0x576/0x790 [ 86.227982][ T5345] __se_sys_ioctl+0xfc/0x170 [ 86.230216][ T5345] do_syscall_64+0xec/0xf80 [ 86.232365][ T5345] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.235077][ T5345] [ 86.235077][ T5345] other info that might help us debug this: [ 86.235077][ T5345] [ 86.239415][ T5345] Possible unsafe locking scenario: [ 86.239415][ T5345] [ 86.242510][ T5345] CPU0 CPU1 [ 86.244738][ T5345] ---- ---- [ 86.247430][ T5345] lock(&conn->lock#2); [ 86.249857][ T5345] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.254919][ T5345] lock(&conn->lock#2); [ 86.258266][ T5345] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.261205][ T5345] [ 86.261205][ T5345] *** DEADLOCK *** [ 86.261205][ T5345] [ 86.264771][ T5345] 5 locks held by syz.0.0/5345: [ 86.267130][ T5345] #0: ffff888011178ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x270 [ 86.271286][ T5345] #1: ffff8880111780c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x1100 [ 86.275567][ T5345] #2: ffffffff8f485c88 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 [ 86.280986][ T5345] #3: ffff888040d81b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0 [ 86.285433][ T5345] #4: ffffffff8df41aa0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xd2/0xbc0 [ 86.289334][ T5345] [ 86.289334][ T5345] stack backtrace: [ 86.291890][ T5345] CPU: 0 UID: 0 PID: 5345 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 86.291907][ T5345] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 86.291915][ T5345] Call Trace: [ 86.291923][ T5345] [ 86.291930][ T5345] dump_stack_lvl+0xe8/0x150 [ 86.291950][ T5345] print_circular_bug+0x2e2/0x300 [ 86.291967][ T5345] check_noncircular+0x12e/0x150 [ 86.291982][ T5345] __lock_acquire+0x15a6/0x2cf0 [ 86.291995][ T5345] ? do_raw_spin_lock+0x121/0x290 [ 86.292011][ T5345] ? __flush_work+0xd2/0xbc0 [ 86.292022][ T5345] lock_acquire+0x107/0x340 [ 86.292032][ T5345] ? __flush_work+0xd2/0xbc0 [ 86.292045][ T5345] ? __flush_work+0xd2/0xbc0 [ 86.292055][ T5345] __flush_work+0x6b8/0xbc0 [ 86.292067][ T5345] ? __flush_work+0xd2/0xbc0 [ 86.292078][ T5345] ? __flush_work+0xd2/0xbc0 [ 86.292089][ T5345] ? __pfx___flush_work+0x10/0x10 [ 86.292100][ T5345] ? __pfx_wq_barrier_func+0x10/0x10 [ 86.292114][ T5345] ? __cancel_work_sync+0x5c/0x110 [ 86.292126][ T5345] __cancel_work_sync+0xbe/0x110 [ 86.292137][ T5345] l2cap_conn_del+0x402/0x5b0 [ 86.292152][ T5345] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 86.292166][ T5345] hci_conn_hash_flush+0x10d/0x260 [ 86.292182][ T5345] hci_dev_close_sync+0x821/0x1100 [ 86.292196][ T5345] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 86.292207][ T5345] ? lockdep_hardirqs_on+0x7b/0x110 [ 86.292217][ T5345] ? enable_work+0x1e9/0x220 [ 86.292229][ T5345] hci_dev_close+0x108/0x270 [ 86.292242][ T5345] sock_do_ioctl+0xdc/0x300 [ 86.292255][ T5345] ? __pfx_sock_do_ioctl+0x10/0x10 [ 86.292266][ T5345] ? do_futex+0x333/0x420 [ 86.292275][ T5345] ? call_rcu+0x644/0x890 [ 86.292290][ T5345] sock_ioctl+0x576/0x790 [ 86.292301][ T5345] ? __pfx_sock_ioctl+0x10/0x10 [ 86.292312][ T5345] ? __fget_files+0x2a/0x420 [ 86.292323][ T5345] ? __fget_files+0x3a0/0x420 [ 86.292332][ T5345] ? __fget_files+0x2a/0x420 [ 86.292342][ T5345] ? bpf_lsm_file_ioctl+0x9/0x20 [ 86.292358][ T5345] ? __pfx_sock_ioctl+0x10/0x10 [ 86.292370][ T5345] __se_sys_ioctl+0xfc/0x170 [ 86.292385][ T5345] do_syscall_64+0xec/0xf80 [ 86.292394][ T5345] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.292404][ T5345] ? trace_irq_disable+0x37/0x100 [ 86.292416][ T5345] ? clear_bhb_loop+0x60/0xb0 [ 86.292427][ T5345] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.292438][ T5345] RIP: 0033:0x7fcadc38f7c9 [ 86.292449][ T5345] 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 [ 86.292457][ T5345] RSP: 002b:00007fcadd143038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 86.292469][ T5345] RAX: ffffffffffffffda RBX: 00007fcadc5e6090 RCX: 00007fcadc38f7c9 [ 86.292478][ T5345] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000008 [ 86.292484][ T5345] RBP: 00007fcadc413f91 R08: 0000000000000000 R09: 0000000000000000 [ 86.292489][ T5345] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 86.292494][ T5345] R13: 00007fcadc5e6128 R14: 00007fcadc5e6090 R15: 00007ffe2e3db2b8 [ 86.292504][ T5345] [ 86.423352][ T5317] Bluetooth: hci0: command tx timeout [ 88.491515][ T5317] Bluetooth: hci0: command tx timeout [ 90.571427][ T5317] Bluetooth: hci0: command tx timeout [ 91.853699][ T9] cfg80211: failed to load regulatory.db