Bluetooth: hci3 command 0x0401 tx timeout Bluetooth: hci3 command 0x0401 tx timeout Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci3 command 0x0401 tx timeout Bluetooth: hci5 command 0x0406 tx timeout INFO: task syz-executor.1:31901 blocked for more than 140 seconds. Not tainted 4.14.231-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28112 31901 30181 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 hci_req_sync+0x5d/0xa0 net/bluetooth/hci_request.c:284 hci_inquiry+0x5c5/0x800 net/bluetooth/hci_core.c:1272 hci_sock_ioctl+0x16d/0x690 net/bluetooth/hci_sock.c:1043 sock_do_ioctl net/socket.c:974 [inline] sock_ioctl+0x2cc/0x4c0 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4665f9 RSP: 002b:00007f097f6cb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000020000380 RSI: 00000000800448f0 RDI: 0000000000000004 RBP: 00000000004bfbb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe4f64f5df R14: 00007f097f6cb300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1534: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor.2/31886: #0: (&hdev->req_lock){+.+.}, at: [] hci_req_sync+0x5d/0xa0 net/bluetooth/hci_request.c:284 1 lock held by syz-executor.1/31901: #0: (&hdev->req_lock){+.+.}, at: [] hci_req_sync+0x5d/0xa0 net/bluetooth/hci_request.c:284 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1534 Comm: khungtaskd Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9391 Comm: kworker/u4:6 Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker task: ffff8880a5916240 task.stack: ffff88804caa8000 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1cd/0x3f0 kernel/locking/lockdep.c:4001 RSP: 0018:ffff88804caafc00 EFLAGS: 00000806 RAX: 1ffffffff11e1259 RBX: ffff8880a5916240 RCX: 0000000000007a4d RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880a5916ac4 RBP: ffff8880533c68f0 R08: ffffffff8b9ccd28 R09: 00000000000405d7 R10: ffff8880a5916b18 R11: ffff8880a5916240 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c025dc87d0 CR3: 00000000b536e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:176 spin_lock_bh include/linux/spinlock.h:322 [inline] batadv_nc_purge_paths+0xce/0x300 net/batman-adv/network-coding.c:450 batadv_nc_worker+0x628/0xc50 net/batman-adv/network-coding.c:727 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 38 d0 7c 08 84 d2 0f 85 0d 02 00 00 48 c7 c0 c8 92 f0 88 48 ba 00 00 00 00 00 fc ff df c7 83 84 08 00 00 00 00 00 00 48 c1 e8 03 <80> 3c 10 00 0f 85 ee 01 00 00 48 83 3d 49 d2 ae 07 00 0f 84 4a