program: syz_clone(0x820000, 0x0, 0x0, 0x0, 0x0, 0x0) r0 = gettid() socketpair$unix(0x1, 0x1, 0x0, &(0x7f0000000600)={0xffffffffffffffff, 0xffffffffffffffff}) socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000200)={0xffffffffffffffff, 0xffffffffffffffff}) sendmmsg$unix(r3, &(0x7f00000bd000), 0x318, 0x0) ioctl$int_in(r1, 0x5452, &(0x7f0000000180)=0xffffffffffffffff) fcntl$setsig(r1, 0xa, 0x12) ppoll(&(0x7f0000000100)=[{r2}], 0x1, 0x0, 0x0, 0x0) r4 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0) connect$bt_l2cap(r4, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x7fc}, 0xe) r5 = syz_init_net_socket$bt_hidp(0x1f, 0x3, 0x6) ioctl$sock_bt_hidp_HIDPCONNADD(r5, 0x400448c8, &(0x7f0000000340)={r4, r4, 0xb, 0x0, 0x0, 0x8, 0xb6, 0x7f, 0x7, 0x801, 0x2, 0x10, 'syz0\x00'}) r6 = syz_open_dev$mouse(&(0x7f0000000040), 0x2, 0x1a5001) ioctl$vim2m_VIDIOC_STREAMON(r6, 0x40045612, &(0x7f0000000400)=0x1) read$msr(r6, 0x0, 0x0) ioctl$VHOST_NET_SET_BACKEND(r6, 0x4008af30, &(0x7f0000000480)={0x0, r6}) r7 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$sock_bt_hci(r7, 0x400448ca, 0x0) syz_open_dev$rtc(&(0x7f00000001c0), 0x4, 0x400040) dup2(r1, r2) fcntl$setown(r2, 0x8, r0) tkill(r0, 0x14) syz_mount_image$ext4(&(0x7f00000002c0)='ext3\x00', &(0x7f0000000300)='./bus\x00', 0x10, &(0x7f0000000240)={[{@jqfmt_vfsv1}, {@nodioread_nolock}, {@jqfmt_vfsold}, {@dax_inode}, {@debug_want_extra_isize={'debug_want_extra_isize', 0x3d, 0x9ecc}}]}, 0xfd, 0x244, &(0x7f0000000680)="$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") creat(&(0x7f0000000300)='./bus\x00', 0x0) mount(&(0x7f0000000440)=@loop={'/dev/loop', 0x0}, &(0x7f0000000080)='./bus\x00', 0x0, 0x1000, 0x0) r8 = open(&(0x7f0000000000)='./bus\x00', 0x40, 0x0) ioctl$LOOP_SET_STATUS64(r8, 0x4c04, &(0x7f00000000c0)={0x0, 0x0, 0x0, 0xcc9, 0x400, 0x0, 0x0, 0x1, 0x0, "ef35af413bb901527fe4d0ca5d29c3ee5e5c3676345a41499db7aac63a01000000000000004faa2ae2c084a0ea0000000000000000000c00002000", "036c47c67808200400000000000000335263bdbcef549ba197fce47ddfdd753abd950100002a00ffffffffffffffff00000000e8f20000000200", "b7326736181c208220000000b9000000000000000000f0fffffffff2ff00", [0x4]}) open(&(0x7f0000000000)='./file1\x00', 0x109042, 0x0) write$binfmt_aout(r8, &(0x7f0000000900)=ANY=[@ANYBLOB="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"/889], 0x379) [ 86.280246][ T5338] Bluetooth: hci0: command tx timeout [ 86.500253][ T5367] input: Bluetooth HID Boot Protocol Device as /devices/virtual/bluetooth/hci0/hci0:200/input5 [ 86.586164][ T5367] [ 86.587227][ T5367] ====================================================== [ 86.590164][ T5367] WARNING: possible circular locking dependency detected [ 86.593016][ T5367] syzkaller #0 Not tainted [ 86.594869][ T5367] ------------------------------------------------------ [ 86.597716][ T5367] syz.0.0/5367 is trying to acquire lock: [ 86.600105][ T5367] ffff888034b8d840 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0xd2/0xbc0 [ 86.604839][ T5367] [ 86.604839][ T5367] but task is already holding lock: [ 86.607814][ T5367] ffff888034b8db38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680 [ 86.611566][ T5367] [ 86.611566][ T5367] which lock already depends on the new lock. [ 86.611566][ T5367] [ 86.615676][ T5367] [ 86.615676][ T5367] the existing dependency chain (in reverse order) is: [ 86.619340][ T5367] [ 86.619340][ T5367] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 86.622421][ T5367] lock_acquire+0x120/0x360 [ 86.624506][ T5367] __mutex_lock+0x187/0x1350 [ 86.626817][ T5367] l2cap_info_timeout+0x60/0xa0 [ 86.629141][ T5367] process_scheduled_works+0xade/0x17b0 [ 86.631786][ T5367] worker_thread+0x8a0/0xda0 [ 86.633878][ T5367] kthread+0x711/0x8a0 [ 86.635776][ T5367] ret_from_fork+0x439/0x7d0 [ 86.637914][ T5367] ret_from_fork_asm+0x1a/0x30 [ 86.640046][ T5367] [ 86.640046][ T5367] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 86.644249][ T5367] validate_chain+0xb9b/0x2140 [ 86.646501][ T5367] __lock_acquire+0xab9/0xd20 [ 86.648858][ T5367] lock_acquire+0x120/0x360 [ 86.651009][ T5367] __flush_work+0x6b8/0xbc0 [ 86.653172][ T5367] __cancel_work_sync+0xbe/0x110 [ 86.655442][ T5367] l2cap_conn_del+0x4f0/0x680 [ 86.657646][ T5367] hci_conn_hash_flush+0x10a/0x230 [ 86.660063][ T5367] hci_dev_close_sync+0xaef/0x1330 [ 86.662552][ T5367] hci_dev_close+0x108/0x200 [ 86.664816][ T5367] sock_do_ioctl+0xd9/0x300 [ 86.666964][ T5367] sock_ioctl+0x576/0x790 [ 86.669100][ T5367] __se_sys_ioctl+0xfc/0x170 [ 86.671278][ T5367] do_syscall_64+0xfa/0x3b0 [ 86.673542][ T5367] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.676287][ T5367] [ 86.676287][ T5367] other info that might help us debug this: [ 86.676287][ T5367] [ 86.680555][ T5367] Possible unsafe locking scenario: [ 86.680555][ T5367] [ 86.683718][ T5367] CPU0 CPU1 [ 86.685970][ T5367] ---- ---- [ 86.688158][ T5367] lock(&conn->lock#2); [ 86.690358][ T5367] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.694508][ T5367] lock(&conn->lock#2); [ 86.697512][ T5367] lock((work_completion)(&(&conn->info_timer)->work)); [ 86.700601][ T5367] [ 86.700601][ T5367] *** DEADLOCK *** [ 86.700601][ T5367] [ 86.704072][ T5367] 5 locks held by syz.0.0/5367: [ 86.706226][ T5367] #0: ffff888034250dc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x200 [ 86.710171][ T5367] #1: ffff8880342500b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x66a/0x1330 [ 86.714184][ T5367] #2: ffffffff8f8a10a8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x230 [ 86.718334][ T5367] #3: ffff888034b8db38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680 [ 86.722196][ T5367] #4: ffffffff8e33a120 (rcu_read_lock){....}-{1:3}, at: __flush_work+0xd2/0xbc0 [ 86.725903][ T5367] [ 86.725903][ T5367] stack backtrace: [ 86.728356][ T5367] CPU: 0 UID: 0 PID: 5367 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 86.728371][ T5367] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 86.728378][ T5367] Call Trace: [ 86.728386][ T5367] [ 86.728391][ T5367] dump_stack_lvl+0x189/0x250 [ 86.728410][ T5367] ? __pfx_dump_stack_lvl+0x10/0x10 [ 86.728424][ T5367] ? __pfx__printk+0x10/0x10 [ 86.728443][ T5367] ? print_lock_name+0xde/0x100 [ 86.728458][ T5367] print_circular_bug+0x2ee/0x310 [ 86.728470][ T5367] check_noncircular+0x134/0x160 [ 86.728483][ T5367] validate_chain+0xb9b/0x2140 [ 86.728494][ T5367] ? do_raw_spin_lock+0x121/0x290 [ 86.728506][ T5367] ? look_up_lock_class+0x74/0x170 [ 86.728517][ T5367] ? register_lock_class+0x51/0x320 [ 86.728532][ T5367] __lock_acquire+0xab9/0xd20 [ 86.728548][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.728560][ T5367] lock_acquire+0x120/0x360 [ 86.728574][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.728586][ T5367] ? _raw_spin_unlock_irq+0x23/0x50 [ 86.728602][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.728613][ T5367] __flush_work+0x6b8/0xbc0 [ 86.728623][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.728634][ T5367] ? __flush_work+0xd2/0xbc0 [ 86.728645][ T5367] ? __pfx___flush_work+0x10/0x10 [ 86.728656][ T5367] ? __pfx_wq_barrier_func+0x10/0x10 [ 86.728669][ T5367] ? __pfx___cancel_work+0x10/0x10 [ 86.728681][ T5367] ? hci_conn_drop+0x14d/0x280 [ 86.728694][ T5367] __cancel_work_sync+0xbe/0x110 [ 86.728703][ T5367] l2cap_conn_del+0x4f0/0x680 [ 86.728711][ T5367] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 86.728720][ T5367] hci_conn_hash_flush+0x10a/0x230 [ 86.728733][ T5367] hci_dev_close_sync+0xaef/0x1330 [ 86.728755][ T5367] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 86.728767][ T5367] ? do_raw_read_unlock+0x3d/0x80 [ 86.728780][ T5367] hci_dev_close+0x108/0x200 [ 86.728793][ T5367] sock_do_ioctl+0xd9/0x300 [ 86.728807][ T5367] ? __pfx_sock_do_ioctl+0x10/0x10 [ 86.728819][ T5367] ? __lock_acquire+0xab9/0xd20 [ 86.728838][ T5367] sock_ioctl+0x576/0x790 [ 86.728850][ T5367] ? __pfx_sock_ioctl+0x10/0x10 [ 86.728862][ T5367] ? __fget_files+0x2a/0x420 [ 86.728875][ T5367] ? __fget_files+0x3a0/0x420 [ 86.728887][ T5367] ? __fget_files+0x2a/0x420 [ 86.728901][ T5367] ? bpf_lsm_file_ioctl+0x9/0x20 [ 86.728914][ T5367] ? __pfx_sock_ioctl+0x10/0x10 [ 86.728926][ T5367] __se_sys_ioctl+0xfc/0x170 [ 86.728937][ T5367] do_syscall_64+0xfa/0x3b0 [ 86.728948][ T5367] ? lockdep_hardirqs_on+0x9c/0x150 [ 86.728957][ T5367] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.728966][ T5367] ? clear_bhb_loop+0x60/0xb0 [ 86.728975][ T5367] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.728985][ T5367] RIP: 0033:0x7f269cd8eec9 [ 86.728996][ T5367] 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 [ 86.729005][ T5367] RSP: 002b:00007f269dc61038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 86.729017][ T5367] RAX: ffffffffffffffda RBX: 00007f269cfe6180 RCX: 00007f269cd8eec9 [ 86.729025][ T5367] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 000000000000000a [ 86.729032][ T5367] RBP: 00007f269ce11f91 R08: 0000000000000000 R09: 0000000000000000 [ 86.729039][ T5367] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 86.729046][ T5367] R13: 00007f269cfe6218 R14: 00007f269cfe6180 R15: 00007ffd7248c018 [ 86.729057][ T5367] [ 86.876766][ T10] cfg80211: failed to load regulatory.db [ 86.888552][ T5369] loop0: detected capacity change from 0 to 128 [ 86.930922][ T5369] EXT4-fs: Mount option(s) incompatible with ext3 [ 88.339044][ T4704] Bluetooth: hci0: command tx timeout [ 90.419350][ T4704] Bluetooth: hci0: command tx timeout [ 92.498959][ T4704] Bluetooth: hci0: command tx timeout