watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u5:6:8050] Modules linked in: irq event stamp: 38494 hardirqs last enabled at (38493): [] kvm_wait arch/x86/kernel/kvm.c:600 [inline] hardirqs last enabled at (38493): [] kvm_wait+0x14b/0x240 arch/x86/kernel/kvm.c:580 hardirqs last disabled at (38494): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (27898): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (27859): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (27859): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 8050 Comm: kworker/u5:6 Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci4 connectable_update_work task: ffff888054a046c0 task.stack: ffff888054a08000 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 RSP: 0018:ffff888054a0fab0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e125c RBX: ffffffff89dd442c RCX: 1ffff1100a940a01 RDX: dffffc0000000000 RSI: ffff888054a04fe8 RDI: ffff888054a04f44 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: dffffc0000000000 R14: ffffffff89dd442d R15: ffffed10174855d8 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff4aa6a9b0 CR3: 000000004fa44000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] kvm_wait arch/x86/kernel/kvm.c:600 [inline] kvm_wait+0x179/0x240 arch/x86/kernel/kvm.c:580 pv_wait arch/x86/include/asm/paravirt.h:679 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:447 [inline] __pv_queued_spin_lock_slowpath+0x722/0x910 kernel/locking/qspinlock.c:465 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:669 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:52 [inline] queued_spin_lock include/asm-generic/qspinlock.h:90 [inline] queued_read_lock_slowpath+0x150/0x190 kernel/locking/qrwlock.c:90 hci_send_to_channel+0x3c/0x200 net/bluetooth/hci_sock.c:261 hci_send_monitor_ctrl_event+0x3dd/0x500 net/bluetooth/hci_sock.c:391 mgmt_send_event+0x2b3/0x330 net/bluetooth/mgmt_util.c:86 mgmt_limited_event net/bluetooth/mgmt.c:260 [inline] new_settings net/bluetooth/mgmt.c:1089 [inline] mgmt_set_connectable_complete+0x299/0x310 net/bluetooth/mgmt.c:1352 connectable_update_work+0xbf/0xf0 net/bluetooth/hci_request.c:1597 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: 2a 5c fa e9 4f ff ff ff 48 89 ef e8 8d 2a 5c fa eb 93 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 94 e4 64 00 fb f4 90 e9 07 00 00 00 0f 00 2d 84 e4 64 00 f4 c3 90 90 41 55 41 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 17994 Comm: syz-executor.0 Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a5238440 task.stack: ffff888054fe8000 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline] RIP: 0010:queued_write_lock_slowpath+0xcb/0x1d0 kernel/locking/qrwlock.c:139 RSP: 0018:ffff888054fefd10 EFLAGS: 00000206 RAX: 0000000000000101 RBX: ffffffff89dd4428 RCX: 000000000000516c RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dd4428 RBP: ffffffff89dd442c R08: ffffffff8b9b8620 R09: 00000000000405a0 R10: ffff8880a5238d18 R11: ffff8880a5238440 R12: 0000000000000003 R13: fffffbfff13ba885 R14: 00000000000000ff R15: ffff8880ab0b0090 FS: 0000000002f61400(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f41b8dc791e CR3: 00000000a4c30000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: queued_write_lock include/asm-generic/qrwlock.h:134 [inline] do_raw_write_lock+0xc2/0x1d0 kernel/locking/spinlock_debug.c:203 bt_sock_unlink+0x1d/0x170 net/bluetooth/af_bluetooth.c:151 hci_sock_release+0xc1/0x4c0 net/bluetooth/hci_sock.c:850 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x41926b RSP: 002b:00007fff285dfd30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 000000000041926b RDX: ffffffffffffffbc RSI: 0000000000000080 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000570b30 R10: 00007fff285dfe20 R11: 0000000000000293 R12: 00000000000f06d9 R13: 00000000000003e8 R14: 000000000056bf60 R15: 00000000000f06c5 Code: 75 dc 49 89 dd 49 89 dc 41 be ff 00 00 00 49 c1 ed 03 41 83 e4 07 48 b8 00 00 00 00 00 fc ff df 49 01 c5 41 83 c4 03 eb 02 f3 90 <41> 0f b6 45 00 41 38 c4 7c 08 84 c0 0f 85 9e 00 00 00 8b 03 83