kvm [12200]: vcpu1, guest rIP: 0xfff0 ignored wrmsr: 0x11e data 0x4 INFO: task syz-executor2:12147 blocked for more than 120 seconds. Not tainted 4.14.0-rc4-mm1+ #15 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D23216 12147 6090 0x00000004 Call Trace: context_switch kernel/sched/core.c:2795 [inline] __schedule+0x8eb/0x2080 kernel/sched/core.c:3374 schedule+0xf5/0x430 kernel/sched/core.c:3433 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3491 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0xadb/0x19d0 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 iterate_bdevs+0xc8/0x260 fs/block_dev.c:2155 sys_sync+0x114/0x1c0 fs/sync.c:115 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4520a9 RSP: 002b:00007f3e540b8c08 EFLAGS: 00000216 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004520a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000000 R13: 0000000000a6f7ef R14: 00007f3e540b99c0 R15: 0000000000000000 Showing all locks held in the system: 3 locks held by kworker/u4:4/236: #0: ("writeback"){+.+.}, at: [] __write_once_size include/linux/compiler.h:305 [inline] #0: ("writeback"){+.+.}, at: [] atomic64_set arch/x86/include/asm/atomic64_64.h:33 [inline] #0: ("writeback"){+.+.}, at: [] atomic_long_set include/asm-generic/atomic-long.h:56 [inline] #0: ("writeback"){+.+.}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("writeback"){+.+.}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("writeback"){+.+.}, at: [] process_one_work+0xad4/0x1bd0 kernel/workqueue.c:2090 #1: ((&(&wb->dwork)->work)){+.+.}, at: [] process_one_work+0xb2c/0x1bd0 kernel/workqueue.c:2094 #2: (&type->s_umount_key#30){++++}, at: [] trylock_super+0x20/0x100 fs/super.c:391 2 locks held by khungtaskd/645: #0: (rcu_read_lock){....}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4552 1 lock held by rsyslogd/2878: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x131/0x1a0 fs/file.c:767 2 locks held by getty/2961: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2133 2 locks held by getty/2962: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2133 2 locks held by getty/2963: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2133 2 locks held by getty/2964: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2133 2 locks held by getty/2965: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2133 2 locks held by getty/2966: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2133 2 locks held by getty/2967: #0: (&tty->ldisc_sem){++++}, at: [] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2133 1 lock held by syz-executor2/12147: #0: (&bdev->bd_mutex){+.+.}, at: [] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2155 1 lock held by syz-executor2/12149: #0: (&bdev->bd_mutex){+.+.}, at: [] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2155 1 lock held by syz-executor6/12163: #0: (&bdev->bd_mutex){+.+.}, at: [] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2155 1 lock held by syz-executor6/12181: #0: (&bdev->bd_mutex){+.+.}, at: [] iterate_bdevs+0xc8/0x260 fs/block_dev.c:2155 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 645 Comm: khungtaskd Not tainted 4.14.0-rc4-mm1+ #15 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 nmi_cpu_backtrace+0x20e/0x240 lib/nmi_backtrace.c:102 nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:61 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 trigger_all_cpu_backtrace include/linux/nmi.h:135 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x90c/0xd60 kernel/hung_task.c:249 kthread+0x3c9/0x4b0 kernel/kthread.c:242 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.0-rc4-mm1+ #15 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffffffff85a2f3c0 task.stack: ffffffff85a00000 RIP: 0010:trace_hardirqs_off_caller+0xd6/0x2c0 kernel/locking/lockdep.c:2962 RSP: 0018:ffff8801db207cf8 EFLAGS: 00000097 RAX: 0000000000000003 RBX: ffffffff85a2f3c0 RCX: 0000000000000000 RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffffff87069c20 RBP: ffff8801db207d10 R08: 0000000000000000 R09: 1ffff1003b640f7e R10: ffffffff85a2f3c0 R11: 0000000000000000 R12: ffffffff85a2f3c0 R13: ffffffff81603d5e R14: 0000000000000097 R15: ffffffff85acb860 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c43d2ab010 CR3: 00000001ce814000 CR4: 00000000001406f0 Call Trace: trace_hardirqs_off+0xd/0x10 kernel/locking/lockdep.c:2980 seqcount_lockdep_reader_access include/linux/seqlock.h:82 [inline] read_seqcount_begin include/linux/seqlock.h:163 [inline] ktime_get+0x2fe/0x3a0 kernel/time/timekeeping.c:800 tick_nohz_irq_enter kernel/time/tick-sched.c:1144 [inline] tick_irq_enter+0x9e/0x390 kernel/time/tick-sched.c:1165 irq_enter+0xbd/0xe0 kernel/softirq.c:345 scheduler_ipi+0x8c/0x460 kernel/sched/core.c:1783 smp_reschedule_interrupt+0xe6/0x670 arch/x86/kernel/smp.c:277 reschedule_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:794 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53 RSP: 0018:ffffffff85a07d08 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffffffff0b40fa4 RCX: 0000000000000000 RDX: 1ffffffff0b59710 RSI: 0000000000000001 RDI: ffffffff85acb880 RBP: ffffffff85a07d08 R08: ffffffff857b5a60 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85acb870 R13: ffffffff85a07dc0 R14: 0000000000000000 R15: ffffffff85acb860 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline] default_idle+0xbf/0x460 arch/x86/kernel/process.c:341 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:332 default_idle_call+0x36/0x90 kernel/sched/idle.c:98 cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x24e/0x3b0 kernel/sched/idle.c:246 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351 rest_init+0xed/0xf0 init/main.c:435 start_kernel+0x735/0x75b init/main.c:712 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:377 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:358 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:238 Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a1 01 00 00 8b 0d 5a ed b1 05 <85> c9 0f 84 e1 00 00 00 48 8d bb 70 08 00 00 48 b8 00 00 00 00