program: r0 = socket$nl_netfilter(0x10, 0x3, 0xc) sendmsg$NFT_BATCH(r0, &(0x7f00000000c0)={0x0, 0x0, &(0x7f0000000040)={&(0x7f0000000200)={{0x14}, [@NFT_MSG_NEWTABLE={0x20, 0x0, 0xa, 0x301, 0x0, 0x0, {0x1, 0x0, 0xfffd}, [@NFTA_TABLE_NAME={0x9, 0x1, 'syz0\x00'}]}, @NFT_MSG_NEWCHAIN={0x2c, 0x3, 0xa, 0x201, 0x0, 0x0, {0x1}, [@NFTA_CHAIN_NAME={0x9, 0x3, 'syz2\x00'}, @NFTA_CHAIN_TABLE={0x9, 0x1, 'syz0\x00'}]}, @NFT_MSG_NEWRULE={0x44, 0x6, 0xa, 0x401, 0x0, 0x0, {0x1}, [@NFTA_RULE_CHAIN_ID={0x8}, @NFTA_RULE_TABLE={0x9, 0x1, 'syz0\x00'}, @NFTA_RULE_EXPRESSIONS={0x1c, 0x4, 0x0, 0x1, [{0x18, 0x1, 0x0, 0x1, @synproxy={{0xd}, @val={0x4}}}]}]}], {0x14}}, 0xb8}}, 0x0) r1 = socket$inet6_tcp(0xa, 0x1, 0x0) bind$inet6(r1, &(0x7f0000000100)={0xa, 0x4e22}, 0x1c) listen(r1, 0x0) syz_emit_ethernet(0x4a, &(0x7f0000000000)={@broadcast, @dev, @void, {@ipv6={0x86dd, @tcp={0x0, 0x6, '\x00', 0x14, 0x6, 0x0, @remote, @local, {[], {{0x0, 0x4e22, 0x41424344, 0x41424344, 0x0, 0x0, 0x5, 0x2}}}}}}}, 0x0) syz_emit_ethernet(0x4a, &(0x7f0000000240)={@local, @link_local, @void, {@ipv6={0x86dd, @tcp={0x0, 0x6, "8a37f2", 0x14, 0x6, 0x0, @remote, @local, {[], {{0x0, 0x4e22, 0x41424344, 0x41424344, 0x0, 0x0, 0x5, 0x4}}}}}}}, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\x00', 0x0) mount(0x0, &(0x7f0000000240)='./file0\x00', &(0x7f0000000280)='hugetlbfs\x00', 0x0, 0x0) mount$tmpfs(0x0, &(0x7f0000000000)='./file0\x00', 0x0, 0x1230023, &(0x7f0000000080)=ANY=[@ANYBLOB="73697aff7f2d2c00"]) r2 = openat$fb0(0xffffffffffffff9c, &(0x7f0000000340), 0x0, 0x0) r3 = syz_init_net_socket$bt_l2cap(0x1f, 0x2, 0x0) connect$bt_l2cap(r3, &(0x7f0000000080)={0x1f, 0x0, @fixed={'\xaa\xaa\xaa\xaa\xaa', 0x10}, 0x7ff}, 0xe) r4 = syz_init_net_socket$bt_hidp(0x1f, 0x3, 0x6) r5 = socket(0x10, 0x3, 0x0) mknodat(0xffffffffffffff9c, &(0x7f0000000040)='./file0\x00', 0x1000, 0x0) r6 = openat$fuse(0xffffffffffffff9c, &(0x7f0000002080), 0x2, 0x0) mount$fuse(0x0, &(0x7f00000020c0)='./file0\x00', &(0x7f0000002100), 0x0, &(0x7f0000002140)={{'fd', 0x3d, r6}, 0x2c, {'rootmode', 0x3d, 0x8000}}) read$FUSE(r6, &(0x7f00000062c0)={0x2020, 0x0, 0x0}, 0x2020) write$FUSE_INIT(r6, &(0x7f0000004200)={0x50, 0x0, r7, {0x7, 0x29, 0x0, 0x80000}}, 0x50) syz_fuse_handle_req(r6, &(0x7f00000042c0)="00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000feff0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000097070000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000016000000000000000000000000000000000000000000000000000000000000000000000000000000000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0x2000, &(0x7f0000000180)={0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, &(0x7f0000000100)={0x20, 0x0, 0x400000000000, {0x0, 0x15}}, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}) r8 = openat(0xffffffffffffff9c, &(0x7f0000000240)='./file0\x00', 0x42, 0x0) umount2(&(0x7f00000002c0)='./file0\x00', 0xb) mmap$IORING_OFF_CQ_RING(&(0x7f0000ff9000/0x4000)=nil, 0x4000, 0x2, 0x12, r8, 0x8000000) setsockopt$netlink_NETLINK_TX_RING(r5, 0x10e, 0xc, &(0x7f0000000040)={0x802}, 0x10) sendmsg$nl_route(r5, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000100)={&(0x7f00000000c0)=ANY=[@ANYBLOB="1c0000001a1c01000000000000000000800000000000ff0800000000"], 0x1c}}, 0x0) ioctl$sock_bt_hidp_HIDPCONNADD(r4, 0x400448c8, &(0x7f0000000340)={r3, r3, 0x8, 0x0, 0x0, 0xb, 0x1, 0xb57, 0xfff9, 0x3, 0x0, 0x8, 'syz0\x00'}) r9 = syz_init_net_socket$bt_hci(0x1f, 0x3, 0x1) ioctl$sock_bt_hci(r9, 0x400448ca, 0x0) ioctl$FBIOPUT_VSCREENINFO(r2, 0x4601, &(0x7f0000000940)={0x60, 0x124, 0x0, 0x0, 0x0, 0x20, 0x0, 0x0, {}, {}, {0x0, 0x5}}) [ 108.183383][ T5304] Bluetooth: hci0: command tx timeout [ 108.260740][ T5323] hugetlbfs: Unknown parameter 'siz˙-' [ 108.327043][ T5323] input: Bluetooth HID Boot Protocol Device as /devices/virtual/bluetooth/hci0/hci0:200/input5 [ 108.404878][ T5323] [ 108.406186][ T5323] ====================================================== [ 108.409448][ T5323] WARNING: possible circular locking dependency detected [ 108.412561][ T5323] syzkaller #0 Not tainted [ 108.414717][ T5323] ------------------------------------------------------ [ 108.418309][ T5323] syz.0.0/5323 is trying to acquire lock: [ 108.421113][ T5323] ffff8880413c2040 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}, at: __flush_work+0x100/0xc50 [ 108.426418][ T5323] [ 108.426418][ T5323] but task is already holding lock: [ 108.430348][ T5323] ffff8880413c22f8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5c0 [ 108.434655][ T5323] [ 108.434655][ T5323] which lock already depends on the new lock. [ 108.434655][ T5323] [ 108.438993][ T5323] [ 108.438993][ T5323] the existing dependency chain (in reverse order) is: [ 108.443793][ T5323] [ 108.443793][ T5323] -> #1 (&conn->lock#2){+.+.}-{4:4}: [ 108.447353][ T5323] __mutex_lock+0x19f/0x1300 [ 108.449468][ T5323] l2cap_info_timeout+0x60/0xa0 [ 108.451892][ T5323] process_scheduled_works+0xb6e/0x18c0 [ 108.454716][ T5323] worker_thread+0xa53/0xfc0 [ 108.457062][ T5323] kthread+0x388/0x470 [ 108.459190][ T5323] ret_from_fork+0x51e/0xb90 [ 108.461396][ T5323] ret_from_fork_asm+0x1a/0x30 [ 108.463660][ T5323] [ 108.463660][ T5323] -> #0 ((work_completion)(&(&conn->info_timer)->work)){+.+.}-{0:0}: [ 108.468083][ T5323] __lock_acquire+0x15a5/0x2cf0 [ 108.470467][ T5323] lock_acquire+0xf0/0x2e0 [ 108.473036][ T5323] __flush_work+0x700/0xc50 [ 108.475958][ T5323] __cancel_work_sync+0xbe/0x110 [ 108.478717][ T5323] l2cap_conn_del+0x40f/0x5c0 [ 108.481105][ T5323] hci_conn_hash_flush+0x10d/0x260 [ 108.483615][ T5323] hci_dev_close_sync+0x821/0x10e0 [ 108.486006][ T5323] hci_dev_close+0x108/0x260 [ 108.488305][ T5323] sock_do_ioctl+0x101/0x320 [ 108.490732][ T5323] sock_ioctl+0x5c6/0x7f0 [ 108.493640][ T5323] __se_sys_ioctl+0xfc/0x170 [ 108.496729][ T5323] do_syscall_64+0x14d/0xf80 [ 108.499173][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 108.501909][ T5323] [ 108.501909][ T5323] other info that might help us debug this: [ 108.501909][ T5323] [ 108.506493][ T5323] Possible unsafe locking scenario: [ 108.506493][ T5323] [ 108.509830][ T5323] CPU0 CPU1 [ 108.512230][ T5323] ---- ---- [ 108.514586][ T5323] lock(&conn->lock#2); [ 108.516458][ T5323] lock((work_completion)(&(&conn->info_timer)->work)); [ 108.520483][ T5323] lock(&conn->lock#2); [ 108.523407][ T5323] lock((work_completion)(&(&conn->info_timer)->work)); [ 108.526955][ T5323] [ 108.526955][ T5323] *** DEADLOCK *** [ 108.526955][ T5323] [ 108.530572][ T5323] 5 locks held by syz.0.0/5323: [ 108.532646][ T5323] #0: ffff888012554ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_close+0x100/0x260 [ 108.537170][ T5323] #1: ffff8880125540c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x10e0 [ 108.542139][ T5323] #2: ffffffff8fd5c768 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x260 [ 108.546890][ T5323] #3: ffff8880413c22f8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5c0 [ 108.551152][ T5323] #4: ffffffff8e75e460 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x100/0xc50 [ 108.555267][ T5323] [ 108.555267][ T5323] stack backtrace: [ 108.557998][ T5323] CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 108.558018][ T5323] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 108.558027][ T5323] Call Trace: [ 108.558036][ T5323] [ 108.558045][ T5323] dump_stack_lvl+0xe8/0x150 [ 108.558070][ T5323] print_circular_bug+0x2e1/0x300 [ 108.558096][ T5323] check_noncircular+0x12e/0x150 [ 108.558118][ T5323] __lock_acquire+0x15a5/0x2cf0 [ 108.558134][ T5323] ? do_raw_spin_lock+0x12b/0x2f0 [ 108.558150][ T5323] ? do_raw_spin_unlock+0x4d/0x210 [ 108.558163][ T5323] lock_acquire+0xf0/0x2e0 [ 108.558178][ T5323] ? __flush_work+0x100/0xc50 [ 108.558195][ T5323] ? __flush_work+0x100/0xc50 [ 108.558211][ T5323] __flush_work+0x700/0xc50 [ 108.558225][ T5323] ? __flush_work+0x100/0xc50 [ 108.558242][ T5323] ? __flush_work+0x100/0xc50 [ 108.558260][ T5323] ? __pfx___flush_work+0x10/0x10 [ 108.558278][ T5323] ? __pfx_wq_barrier_func+0x10/0x10 [ 108.558303][ T5323] ? __cancel_work_sync+0x5c/0x110 [ 108.558320][ T5323] __cancel_work_sync+0xbe/0x110 [ 108.558336][ T5323] l2cap_conn_del+0x40f/0x5c0 [ 108.558356][ T5323] ? __pfx_l2cap_disconn_cfm+0x10/0x10 [ 108.558399][ T5323] hci_conn_hash_flush+0x10d/0x260 [ 108.558421][ T5323] hci_dev_close_sync+0x821/0x10e0 [ 108.558443][ T5323] ? __pfx_hci_dev_close_sync+0x10/0x10 [ 108.558459][ T5323] ? lockdep_hardirqs_on+0x7a/0x110 [ 108.558472][ T5323] ? enable_work+0x1fd/0x230 [ 108.558493][ T5323] hci_dev_close+0x108/0x260 [ 108.558508][ T5323] sock_do_ioctl+0x101/0x320 [ 108.558522][ T5323] ? __pfx_sock_do_ioctl+0x10/0x10 [ 108.558534][ T5323] ? do_futex+0x395/0x420 [ 108.558550][ T5323] sock_ioctl+0x5c6/0x7f0 [ 108.558564][ T5323] ? __pfx_sock_ioctl+0x10/0x10 [ 108.558578][ T5323] ? __fget_files+0x2a/0x420 [ 108.558598][ T5323] ? __fget_files+0x3a0/0x420 [ 108.558614][ T5323] ? __fget_files+0x2a/0x420 [ 108.558629][ T5323] ? bpf_lsm_file_ioctl+0x9/0x20 [ 108.558643][ T5323] ? __pfx_sock_ioctl+0x10/0x10 [ 108.558654][ T5323] __se_sys_ioctl+0xfc/0x170 [ 108.558667][ T5323] do_syscall_64+0x14d/0xf80 [ 108.558678][ T5323] ? trace_irq_disable+0x3b/0x150 [ 108.558696][ T5323] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 108.558711][ T5323] ? clear_bhb_loop+0x40/0x90 [ 108.558729][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 108.558744][ T5323] RIP: 0033:0x7f3053d9c799 [ 108.558787][ T5323] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 [ 108.558800][ T5323] RSP: 002b:00007f3054ba1fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 108.558815][ T5323] RAX: ffffffffffffffda RBX: 00007f3054015fa0 RCX: 00007f3053d9c799 [ 108.558824][ T5323] RDX: 0000000000000000 RSI: 00000000400448ca RDI: 000000000000000b [ 108.558832][ T5323] RBP: 00007f3053e32c99 R08: 0000000000000000 R09: 0000000000000000 [ 108.558840][ T5323] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 108.558847][ T5323] R13: 00007f3054016038 R14: 00007f3054015fa0 R15: 00007ffe5c31d578 [ 108.558863][ T5323] [ 110.242592][ T4667] Bluetooth: hci0: command tx timeout [ 112.323410][ T4667] Bluetooth: hci0: command tx timeout [ 114.402972][ T4667] Bluetooth: hci0: command tx timeout