watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.0:12363] Modules linked in: irq event stamp: 8240 hardirqs last enabled at (8239): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (8240): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (3082): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (2989): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (2989): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 12363 Comm: syz-executor.0 Not tainted 4.14.228-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880ab23a180 task.stack: ffff888049720000 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:ffff888049727d10 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000101 RBX: ffffffff89dd42a8 RCX: 00000000000039d1 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff89dd42a8 RBP: ffffffff89dd42ac R08: ffffffff8b9aa948 R09: 00000000000405a5 R10: ffff8880ab23aa58 R11: ffff8880ab23a180 R12: 0000000000000003 R13: fffffbfff13ba855 R14: 00000000000000ff R15: ffff88809f2062d0 FS: 000000000255f400(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e723000 CR3: 00000000aa2ca000 CR4: 00000000001406f0 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:00007ffd38b77680 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 000000000041926b RDX: ffffffffffffffbc RSI: 00000000089075c3 RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2e722b44 R10: 00007ffd38b77770 R11: 0000000000000293 R12: 0000000000073d01 R13: 00000000000003e8 R14: 000000000056bf60 R15: 0000000000073cdb 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 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8034 Comm: kworker/u5:6 Not tainted 4.14.228-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: hci0 connectable_update_work task: ffff8880a1b766c0 task.stack: ffff88804ea60000 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:check_cpu_stall kernel/rcu/tree.c:1598 [inline] RIP: 0010:__rcu_pending kernel/rcu/tree.c:3390 [inline] RIP: 0010:rcu_pending kernel/rcu/tree.c:3452 [inline] RIP: 0010:rcu_check_callbacks+0x352/0x1370 kernel/rcu/tree.c:2792 RSP: 0000:ffff8880ba507d30 EFLAGS: 00000046 RAX: 1ffffffff11ef435 RBX: ffff8880ba52af00 RCX: 0000000100006d21 RDX: 0000000000000000 RSI: ffffffff87ccea00 RDI: 0000000000000000 RBP: ffff8880ba52af20 R08: 0000000000000000 R09: ffffffff88f7a1a8 R10: ffffffff88f79ec8 R11: 0000000000000d30 R12: 0000000100004e3f R13: dffffc0000000000 R14: ffffffff88f79b00 R15: ffffffff88f79b00 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff64f376718 CR3: 000000009d232000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: update_process_times+0x29/0x60 kernel/time/timer.c:1591 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x92/0x200 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x30b/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61 RSP: 0000:ffff88804ea67ab0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e125c RBX: ffffffff89dd42ac RCX: 1ffff1101436ee01 RDX: dffffc0000000000 RSI: ffff8880a1b76fe8 RDI: ffff8880a1b76f44 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: dffffc0000000000 R14: ffffffff89dd42ad R15: ffffed10174a55d8 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: 0c 0c 00 00 4d 8b 9e c8 03 00 00 4d 8d 8e a8 06 00 00 4c 89 c8 48 c1 e8 03 42 80 3c 28 00 0f 85 c1 0b 00 00 49 8b 8e a8 06 00 00 <4d> 8d 86 98 06 00 00 4c 89 c0 48 c1 e8 03 42 80 3c 28 00 0f 85