kvm [18898]: vcpu0, guest rIP: 0xfff0 unimplemented MMIO_CONF_BASE wrmsr: 0x1776be00 INFO: task kworker/0:1:25 blocked for more than 120 seconds. Not tainted 4.16.0+ #288 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:1 D21232 25 2 0x80000000 Workqueue: events cgwb_release_workfn Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x8fb/0x1ef0 kernel/sched/core.c:3490 schedule+0xf5/0x430 kernel/sched/core.c:3549 bit_wait+0x18/0x90 kernel/sched/wait_bit.c:197 __wait_on_bit+0x88/0x130 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0x204/0x3a0 kernel/sched/wait_bit.c:63 wait_on_bit include/linux/wait_bit.h:76 [inline] wb_shutdown+0x335/0x430 mm/backing-dev.c:377 cgwb_release_workfn+0x8b/0x622 mm/backing-dev.c:520 process_one_work+0xc97/0x1c40 kernel/workqueue.c:2113 worker_thread+0x1c3/0x1380 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411 Showing all locks held in the system: 2 locks held by kworker/0:1/25: #0: 00000000f240d1b3 ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline] #0: 00000000f240d1b3 ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000f240d1b3 ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000f240d1b3 ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:57 [inline] #0: 00000000f240d1b3 ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline] #0: 00000000f240d1b3 ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: 00000000f240d1b3 ((wq_completion)"events"){+.+.}, at: process_one_work+0xb83/0x1c40 kernel/workqueue.c:2084 #1: 0000000076c2e85d ((work_completion)(&wb->release_work)){+.+.}, at: process_one_work+0xbd9/0x1c40 kernel/workqueue.c:2088 2 locks held by khungtaskd/877: #0: 0000000040ab13bd (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: 0000000040ab13bd (rcu_read_lock){....}, at: watchdog+0x1d6/0xd70 kernel/hung_task.c:249 #1: 000000000d52ab60 (tasklist_lock){.+.+}, at: debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470 2 locks held by getty/4445: #0: 00000000afb0eb2f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000046d2da1c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4446: #0: 00000000b993cd96 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000afa0df76 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4447: #0: 0000000062d49ebf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000002a9f8cd9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4448: #0: 000000002f025a1f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000a8bbb035 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4449: #0: 000000009bc17740 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000fee44f80 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4450: #0: 00000000b15434c5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000011693b73 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by getty/4451: #0: 000000000421062e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000008989ed00 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131 2 locks held by syz-executor3/18930: #0: 00000000997ef239 (&sig->cred_guard_mutex){+.+.}, at: SYSC_perf_event_open+0xe19/0x2a20 kernel/events/core.c:10457 #1: 00000000c56cc22a (perf_sched_mutex){+.+.}, at: account_event kernel/events/core.c:9862 [inline] #1: 00000000c56cc22a (perf_sched_mutex){+.+.}, at: perf_event_alloc+0x24a7/0x2cd0 kernel/events/core.c:10054 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 877 Comm: khungtaskd Not tainted 4.16.0+ #288 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+0x1a7/0x27d lib/dump_stack.c:53 nmi_cpu_backtrace+0x1e0/0x220 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x969/0xd70 kernel/hung_task.c:249 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 18934 Comm: syz-executor0 Not tainted 4.16.0+ #288 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_is_held+0x62/0x140 kernel/locking/lockdep.c:3737 RSP: 0018:ffff8801b4e0f0c8 EFLAGS: 00000002 RAX: 0000000000000001 RBX: 0000000000000082 RCX: ffffffff830f4ff3 RDX: 1ffff1003610b50e RSI: 00000000ffffffff RDI: ffff8801db12c518 RBP: ffff8801b4e0f108 R08: ffffed003b6258a1 R09: ffffed003b6258a1 R10: 0000000000000001 R11: ffffed003b6258a0 R12: ffff8801b085a000 R13: ffff8801b085a870 R14: ffff8801b4e08000 R15: ffff8801b085a000 FS: 0000000000000000(0000) GS:ffff8801db100000(0063) knlGS:00000000f5ff0b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001c7fa4000 CR4: 00000000001426e0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_is_held_type+0x118/0x210 kernel/locking/lockdep.c:3958 lock_is_held include/linux/lockdep.h:344 [inline] update_rq_clock+0x134/0x180 kernel/sched/core.c:192 __schedule+0x2d2/0x1ef0 kernel/sched/core.c:3433 preempt_schedule_common+0x22/0x60 kernel/sched/core.c:3629 _cond_resched+0x1d/0x30 kernel/sched/core.c:4978 slab_pre_alloc_hook mm/slab.h:420 [inline] slab_alloc mm/slab.c:3366 [inline] kmem_cache_alloc_trace+0x29e/0x740 mm/slab.c:3606 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] kvm_arch_vcpu_init+0x362/0x860 arch/x86/kvm/x86.c:8367 kvm_vcpu_init+0x2f9/0x400 arch/x86/kvm/../../../virt/kvm/kvm_main.c:292 vmx_create_vcpu+0x133/0x2f60 arch/x86/kvm/vmx.c:9729 kvm_arch_vcpu_create+0xb0/0x1d0 arch/x86/kvm/x86.c:8053 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:2451 [inline] kvm_vm_ioctl+0x49c/0x1bf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2949 kvm_vm_compat_ioctl+0x2ed/0x3f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3141 C_SYSC_ioctl fs/compat_ioctl.c:1461 [inline] compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1407 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7ff4c99 RSP: 002b:00000000f5ff00ac EFLAGS: 00000282 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 000000000000ae41 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Code: 48 89 7d d0 0f b6 04 02 89 75 c4 84 c0 74 08 3c 03 0f 8e c8 00 00 00 41 8b 84 24 70 08 00 00 85 c0 0f 8e a7 00 00 00 4c 8b 6d c8 <48> b8 00 00 00 00 00 fc ff df 4d 8d bc 24 78 08 00 00 45 31 f6