REISERFS warning (device loop1): sh-2021 reiserfs_fill_super: can not find reiserfs on loop1 REISERFS warning (device loop7): sh-2021 reiserfs_fill_super: can not find reiserfs on loop7 REISERFS warning (device loop2): sh-2021 reiserfs_fill_super: can not find reiserfs on loop2 REISERFS warning (device loop6): sh-2021 reiserfs_fill_super: can not find reiserfs on loop6 INFO: task syzkaller983646:4594 blocked for more than 120 seconds. Not tainted 4.17.0-rc1+ #10 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syzkaller983646 D24552 4594 4535 0x00000004 Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3490 schedule+0xef/0x430 kernel/sched/core.c:3549 blk_mq_freeze_queue_wait+0x1ce/0x460 block/blk-mq.c:136 blk_freeze_queue+0x4a/0x80 block/blk-mq.c:165 blk_mq_freeze_queue+0x15/0x20 block/blk-mq.c:174 loop_change_fd drivers/block/loop.c:667 [inline] lo_ioctl+0xa9a/0x2130 drivers/block/loop.c:1378 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x9b6/0x2020 block/ioctl.c:601 block_ioctl+0xee/0x130 fs/block_dev.c:1877 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1cf/0x16a0 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x445569 RSP: 002b:00007ffc4cebd4a8 EFLAGS: 00000286 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000010 RCX: 0000000000445569 RDX: 0000000000000004 RSI: 0000000000004c06 RDI: 0000000000000004 RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000000a R11: 0000000000000286 R12: 0000000000000006 R13: 0000000001324850 R14: 00000000006d2440 R15: 0000000000000000 Showing all locks held in the system: 2 locks held by khungtaskd/892: #0: 00000000b3968321 (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: 00000000b3968321 (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: 0000000061dd421c (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 1 lock held by rsyslogd/4416: #0: 00000000cad1b4ce (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766 2 locks held by getty/4506: #0: 00000000a14f3a69 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000060a7641e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4507: #0: 0000000060f33604 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000c963aea9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4508: #0: 0000000094d6fe50 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000f42ea688 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4509: #0: 00000000e0e6a988 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000004d79e496 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4510: #0: 00000000a49be3a9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000005628954d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4511: #0: 0000000079c55c9a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000008ebc4b21 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4512: #0: 0000000086afb65b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000a29b1c5a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 1 lock held by syzkaller983646/4594: #0: 000000002b4439e4 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x2130 drivers/block/loop.c:1369 1 lock held by syzkaller983646/7695: #0: 000000002b4439e4 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x2130 drivers/block/loop.c:1369 1 lock held by syzkaller983646/7701: #0: 000000002b4439e4 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x2130 drivers/block/loop.c:1369 1 lock held by syzkaller983646/7703: #0: 000000002b4439e4 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x2130 drivers/block/loop.c:1369 1 lock held by syzkaller983646/7712: #0: 000000002b4439e4 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x2130 drivers/block/loop.c:1369 1 lock held by syzkaller983646/7719: #0: 000000002b4439e4 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x2130 drivers/block/loop.c:1369 1 lock held by syzkaller983646/7724: #0: 000000002b4439e4 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x2130 drivers/block/loop.c:1369 1 lock held by syzkaller983646/7731: #0: 000000002b4439e4 (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x2130 drivers/block/loop.c:1369 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 892 Comm: khungtaskd Not tainted 4.17.0-rc1+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 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+0xc10/0xf60 kernel/hung_task.c:249 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.17.0-rc1+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rdtsc arch/x86/include/asm/msr.h:205 [inline] RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:232 [inline] RIP: 0010:pvclock_clocksource_read+0x124/0x670 arch/x86/kernel/pvclock.c:87 RSP: 0018:ffff8801daf07a78 EFLAGS: 00000006 RAX: 00000000f8926323 RBX: ffff88021fff8040 RCX: 0000000000000001 RDX: 0000000000000295 RSI: ffffffff81686de9 RDI: ffff88021fff805c RBP: ffff8801daf07b68 R08: ffff88021fff8058 R09: ffff88021fff805b R10: ffffed0043fff009 R11: ffff88021fff8057 R12: dffffc0000000000 R13: ffff88021fff8043 R14: ffff88021fff805d R15: ffff88021fff8050 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8d7be1b000 CR3: 00000001ac981000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kvm_clock_read+0x25/0x30 arch/x86/kernel/kvmclock.c:89 kvm_clock_get_cycles+0x9/0x10 arch/x86/kernel/kvmclock.c:96 tk_clock_read kernel/time/timekeeping.c:166 [inline] timekeeping_get_delta kernel/time/timekeeping.c:260 [inline] timekeeping_get_ns kernel/time/timekeeping.c:367 [inline] ktime_get+0x240/0x430 kernel/time/timekeeping.c:740 tick_nohz_irq_enter kernel/time/tick-sched.c:1237 [inline] tick_irq_enter+0x83/0x390 kernel/time/tick-sched.c:1258 irq_enter+0xb6/0xd0 kernel/softirq.c:346 scheduler_ipi+0x39b/0xa30 kernel/sched/core.c:1768 smp_reschedule_interrupt+0xed/0x660 arch/x86/kernel/smp.c:277 reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:887 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 RSP: 0018:ffff8801d9ae7c38 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffff1003b35cf8a RCX: 0000000000000000 RDX: 1ffffffff11a3130 RSI: 0000000000000001 RDI: ffffffff88d18980 RBP: ffff8801d9ae7c38 R08: ffffed003b5e46c3 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8801d9ae7cf0 R14: ffffffff897be8e0 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xc2/0x440 arch/x86/kernel/process.c:354 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:345 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x395/0x560 kernel/sched/idle.c:262 cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:368 start_secondary+0x426/0x5b0 arch/x86/kernel/smpboot.c:267 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242 Code: e2 48 c1 e8 03 48 89 bd 68 ff ff ff 4c 01 e0 4c 89 8d 48 ff ff ff 48 89 85 58 ff ff ff 83 e2 fe 89 95 70 ff ff ff 0f ae e8 0f 31 <48> c1 e2 20 48 8b bd 50 ff ff ff 48 8b b5 60 ff ff ff 48 09 d0