[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   56.824238][   T26] audit: type=1800 audit(1572167709.456:25): pid=8672 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[   56.844471][   T26] audit: type=1800 audit(1572167709.456:26): pid=8672 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[   56.888987][   T26] audit: type=1800 audit(1572167709.466:27): pid=8672 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.0.140' (ECDSA) to the list of known hosts.
syzkaller login: [  236.940650][  T951] INFO: task kworker/u4:2:77 blocked for more than 143 seconds.
[  236.949173][  T951]       Not tainted 5.4.0-rc4-next-20191025 #0
[  236.956123][  T951] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  236.964974][  T951] kworker/u4:2    D24344    77      2 0x80004000
[  236.971386][  T951] Workqueue: writeback wb_workfn (flush-8:0)
[  236.977363][  T951] Call Trace:
[  236.980758][  T951]  __schedule+0x94a/0x1e70
[  236.985251][  T951]  ? __sched_text_start+0x8/0x8
[  236.990124][  T951]  ? blk_insert_cloned_request+0x530/0x530
[  236.995987][  T951]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[  237.002273][  T951]  ? kthread_data+0x58/0xc0
[  237.006782][  T951]  schedule+0xdc/0x2b0
[  237.010984][  T951]  io_schedule+0x1c/0x70
[  237.015248][  T951]  __lock_page+0x422/0xab0
[  237.019674][  T951]  ? wait_on_page_bit+0xa60/0xa60
[  237.024755][  T951]  ? page_cache_next_miss+0x340/0x340
[  237.030140][  T951]  ? ___might_sleep+0x163/0x2c0
[  237.035058][  T951]  ? __might_sleep+0x95/0x190
[  237.039752][  T951]  mpage_prepare_extent_to_map+0xb3f/0xf90
[  237.045616][  T951]  ? mpage_process_page_bufs+0x780/0x780
[  237.051288][  T951]  ? rcu_read_lock_sched_held+0x9c/0xd0
[  237.056832][  T951]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[  237.062859][  T951]  ? kmem_cache_alloc_node_trace+0x4ef/0x750
[  237.068866][  T951]  ext4_writepages+0x954/0x2e70
[  237.073820][  T951]  ? ___might_sleep+0x163/0x2c0
[  237.078693][  T951]  ? __might_sleep+0x80/0x190
[  237.084137][  T951]  ? print_usage_bug+0xb1/0xd0
[  237.089028][  T951]  ? ext4_mark_inode_dirty+0x9b0/0x9b0
[  237.094547][  T951]  ? __kasan_check_read+0x11/0x20
[  237.099586][  T951]  ? __lock_acquire+0x16f2/0x4a00
[  237.104664][  T951]  ? __kasan_check_read+0x11/0x20
[  237.109692][  T951]  ? mark_lock+0xc2/0x1220
[  237.114292][  T951]  ? mark_held_locks+0xf0/0xf0
[  237.119063][  T951]  ? __kasan_check_read+0x11/0x20
[  237.124138][  T951]  ? ext4_mark_inode_dirty+0x9b0/0x9b0
[  237.129602][  T951]  do_writepages+0xfa/0x2a0
[  237.134261][  T951]  ? do_writepages+0xfa/0x2a0
[  237.138949][  T951]  ? page_writeback_cpu_online+0x20/0x20
[  237.144627][  T951]  ? rcu_lockdep_current_cpu_online+0xe3/0x130
[  237.150856][  T951]  ? rcu_read_lock_sched_held+0x9c/0xd0
[  237.156424][  T951]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[  237.162464][  T951]  __writeback_single_inode+0x136/0x1400
[  237.168174][  T951]  ? _raw_spin_unlock+0x28/0x40
[  237.173250][  T951]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[  237.179522][  T951]  ? wbc_attach_and_unlock_inode+0x5bf/0x920
[  237.185658][  T951]  writeback_sb_inodes+0x596/0xf20
[  237.190869][  T951]  ? __writeback_single_inode+0x1400/0x1400
[  237.196788][  T951]  ? trylock_super+0x22/0x110
[  237.201539][  T951]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[  237.207808][  T951]  __writeback_inodes_wb+0xc3/0x260
[  237.213902][  T951]  wb_writeback+0x910/0xd90
[  237.218466][  T951]  ? mark_lock+0xc2/0x1220
[  237.222949][  T951]  ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0
[  237.229304][  T951]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
[  237.235099][  T951]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
[  237.240926][  T951]  ? get_nr_dirty_inodes+0xe2/0x140
[  237.246129][  T951]  wb_workfn+0xba5/0x1220
[  237.250462][  T951]  ? inode_wait_for_writeback+0x40/0x40
[  237.256070][  T951]  ? rcu_lockdep_current_cpu_online+0xe3/0x130
[  237.262303][  T951]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[  237.268396][  T951]  ? trace_hardirqs_on+0x67/0x240
[  237.273476][  T951]  process_one_work+0x9af/0x1740
[  237.278457][  T951]  ? pwq_dec_nr_in_flight+0x320/0x320
[  237.283887][  T951]  ? lock_acquire+0x190/0x410
[  237.288590][  T951]  worker_thread+0x98/0xe40
[  237.293161][  T951]  ? trace_hardirqs_on+0x67/0x240
[  237.298196][  T951]  kthread+0x361/0x430
[  237.302312][  T951]  ? process_one_work+0x1740/0x1740
[  237.307513][  T951]  ? kthread_mod_delayed_work+0x1f0/0x1f0
[  237.313304][  T951]  ret_from_fork+0x24/0x30
[  237.317731][  T951] INFO: task khugepaged:1083 blocked for more than 143 seconds.
[  237.325470][  T951]       Not tainted 5.4.0-rc4-next-20191025 #0
[  237.331682][  T951] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  237.340363][  T951] khugepaged      D27840  1083      2 0x80004000
[  237.347476][  T951] Call Trace:
[  237.351015][  T951]  __schedule+0x94a/0x1e70
[  237.355451][  T951]  ? __sched_text_start+0x8/0x8
[  237.360365][  T951]  ? blk_insert_cloned_request+0x530/0x530
[  237.367002][  T951]  ? _raw_spin_unlock_irq+0x23/0x80
[  237.372251][  T951]  ? __lock_page+0x3d9/0xab0
[  237.377014][  T951]  ? _raw_spin_unlock_irq+0x23/0x80
[  237.382243][  T951]  schedule+0xdc/0x2b0
[  237.386474][  T951]  io_schedule+0x1c/0x70
[  237.390796][  T951]  __lock_page+0x422/0xab0
[  237.395632][  T951]  ? wait_on_page_bit+0xa60/0xa60
[  237.400841][  T951]  ? page_cache_next_miss+0x340/0x340
[  237.406335][  T951]  ? ___might_sleep+0x163/0x2c0
[  237.411253][  T951]  ? __might_sleep+0x95/0x190
[  237.416097][  T951]  mpage_prepare_extent_to_map+0xb3f/0xf90
[  237.422334][  T951]  ? mpage_process_page_bufs+0x780/0x780
[  237.427994][  T951]  ? rcu_read_lock_any_held.part.0+0x50/0x50
[  237.434068][  T951]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[  237.440433][  T951]  ext4_writepages+0xb6a/0x2e70
[  237.445366][  T951]  ? scheduler_ipi+0x10c/0x610
[  237.450275][  T951]  ? ext4_mark_inode_dirty+0x9b0/0x9b0
[  237.455884][  T951]  ? 0xffffffff81000000
[  237.460063][  T951]  ? mark_lock+0xc2/0x1220
[  237.464614][  T951]  ? prep_new_page+0x19f/0x200
[  237.469511][  T951]  ? wbc_attach_and_unlock_inode+0x515/0x920
[  237.476278][  T951]  ? find_held_lock+0x35/0x130
[  237.481207][  T951]  ? wbc_attach_and_unlock_inode+0x515/0x920
[  237.487296][  T951]  ? ext4_mark_inode_dirty+0x9b0/0x9b0
[  237.492811][  T951]  do_writepages+0xfa/0x2a0
[  237.497324][  T951]  ? do_writepages+0xfa/0x2a0
[  237.502070][  T951]  ? lock_downgrade+0x920/0x920
[  237.507069][  T951]  ? page_writeback_cpu_online+0x20/0x20
[  237.512776][  T951]  ? __kasan_check_read+0x11/0x20
[  237.517825][  T951]  ? do_raw_spin_unlock+0x57/0x270
[  237.523097][  T951]  ? _raw_spin_unlock+0x28/0x40
[  237.527967][  T951]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[  237.534761][  T951]  ? wbc_attach_and_unlock_inode+0x5bf/0x920
[  237.540988][  T951]  __filemap_fdatawrite_range+0x2bc/0x3b0
[  237.546703][  T951]  ? delete_from_page_cache_batch+0xfe0/0xfe0
[  237.552954][  T951]  ? lockdep_hardirqs_on+0x421/0x5e0
[  237.558259][  T951]  filemap_flush+0x24/0x30
[  237.562737][  T951]  collapse_file+0x36b1/0x41a0
[  237.567511][  T951]  ? rcu_lockdep_current_cpu_online+0xe3/0x130
[  237.574044][  T951]  ? khugepaged+0x21d0/0x4360
[  237.578739][  T951]  ? trace_event_raw_event_mm_collapse_huge_page_isolate+0x370/0x370
[  237.587046][  T951]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
[  237.592836][  T951]  ? khugepaged_find_target_node+0x142/0x180
[  237.598817][  T951]  khugepaged+0x2da9/0x4360
[  237.604107][  T951]  ? __kasan_check_read+0x11/0x20
[  237.609141][  T951]  ? __lock_acquire+0x16f2/0x4a00
[  237.614798][  T951]  ? collapse_pte_mapped_thp+0xbe0/0xbe0
[  237.620452][  T951]  ? lock_downgrade+0x920/0x920
[  237.625367][  T951]  ? finish_wait+0x260/0x260
[  237.629963][  T951]  ? lockdep_hardirqs_on+0x421/0x5e0
[  237.635323][  T951]  ? trace_hardirqs_on+0x67/0x240
[  237.640455][  T951]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[  237.646773][  T951]  ? __kthread_parkme+0x108/0x1c0
[  237.651867][  T951]  ? __kasan_check_read+0x11/0x20
[  237.656900][  T951]  kthread+0x361/0x430
[  237.661024][  T951]  ? collapse_pte_mapped_thp+0xbe0/0xbe0
[  237.666692][  T951]  ? kthread_mod_delayed_work+0x1f0/0x1f0
[  237.672460][  T951]  ret_from_fork+0x24/0x30
[  237.676955][  T951] 
[  237.676955][  T951] Showing all locks held in the system:
[  237.684776][  T951] 4 locks held by kworker/u4:2/77:
[  237.689905][  T951]  #0: ffff8880a8326128 ((wq_completion)writeback){+.+.}, at: process_one_work+0x88b/0x1740
[  237.700050][  T951]  #1: ffff8880a94afdc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x8c1/0x1740
[  237.711419][  T951]  #2: ffff88809b60a0d8 (&type->s_umount_key#32){++++}, at: trylock_super+0x22/0x110
[  237.720936][  T951]  #3: ffff88809b60c990 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0xfa/0x2a0
[  237.731614][  T951] 1 lock held by khungtaskd/951:
[  237.736658][  T951]  #0: ffffffff88faba80 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279
[  237.746014][  T951] 1 lock held by khugepaged/1083:
[  237.751096][  T951]  #0: ffff88809b60c990 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0xfa/0x2a0
[  237.761002][  T951] 1 lock held by rsyslogd/8711:
[  237.765845][  T951]  #0: ffff8880a0611660 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
[  237.774530][  T951] 2 locks held by getty/8800:
[  237.779285][  T951]  #0: ffff8880a75a8090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  237.788289][  T951]  #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  237.798006][  T951] 2 locks held by getty/8801:
[  237.802717][  T951]  #0: ffff8880a39b5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  237.811731][  T951]  #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  237.821339][  T951] 2 locks held by getty/8802:
[  237.826006][  T951]  #0: ffff88809a4e0090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  237.835027][  T951]  #1: ffffc90005f0d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  237.844685][  T951] 2 locks held by getty/8803:
[  237.849360][  T951]  #0: ffff8880951db090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  237.858522][  T951]  #1: ffffc90005f092e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  237.868794][  T951] 2 locks held by getty/8804:
[  237.873516][  T951]  #0: ffff888097a1f090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  237.882529][  T951]  #1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  237.892149][  T951] 2 locks held by getty/8805:
[  237.896814][  T951]  #0: ffff888092898090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  237.905811][  T951]  #1: ffffc90005f152e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  237.915432][  T951] 2 locks held by getty/8806:
[  237.920096][  T951]  #0: ffff8880a17a3090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[  237.929084][  T951]  #1: ffffc90005ef12e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0
[  237.938824][  T951] 1 lock held by syz-execprog/8823:
[  237.944164][  T951]  #0: ffff8880976703e8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2
[  237.954127][  T951] 
[  237.956446][  T951] =============================================
[  237.956446][  T951] 
[  237.964897][  T951] NMI backtrace for cpu 1
[  237.969246][  T951] CPU: 1 PID: 951 Comm: khungtaskd Not tainted 5.4.0-rc4-next-20191025 #0
[  237.977747][  T951] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  237.987824][  T951] Call Trace:
[  237.991108][  T951]  dump_stack+0x172/0x1f0
[  237.995451][  T951]  nmi_cpu_backtrace.cold+0x70/0xb2
[  238.000637][  T951]  ? vprintk_func+0x86/0x189
[  238.005319][  T951]  ? lapic_can_unplug_cpu.cold+0x3a/0x3a
[  238.010943][  T951]  nmi_trigger_cpumask_backtrace+0x23b/0x28b
[  238.023964][  T951]  arch_trigger_cpumask_backtrace+0x14/0x20
[  238.029846][  T951]  watchdog+0xc8f/0x1350
[  238.034107][  T951]  kthread+0x361/0x430
[  238.038191][  T951]  ? reset_hung_task_detector+0x30/0x30
[  238.043732][  T951]  ? kthread_mod_delayed_work+0x1f0/0x1f0
[  238.049454][  T951]  ret_from_fork+0x24/0x30
[  238.054010][  T951] Sending NMI from CPU 1 to CPUs 0:
[  238.059785][    C0] NMI backtrace for cpu 0
[  238.059790][    C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc4-next-20191025 #0
[  238.059796][    C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  238.059799][    C0] RIP: 0010:__kasan_check_read+0xc/0x20
[  238.059809][    C0] Code: 48 8b 73 58 89 c2 48 c7 c7 78 d7 aa 88 f7 da e8 ee cf ad ff e9 0e ef ff ff 90 90 90 90 90 55 89 f6 31 d2 48 89 e5 48 8b 4d 08 <e8> cf 26 00 00 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 55 89
[  238.059812][    C0] RSP: 0018:ffff8880ae809e18 EFLAGS: 00000046
[  238.059820][    C0] RAX: 0000000000000000 RBX: 1ffff11015d013ca RCX: ffffffff81598e11
[  238.059824][    C0] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff89c828c0
[  238.059828][    C0] RBP: ffff8880ae809e18 R08: 0000000000005565 R09: fffffbfff14f3935
[  238.059833][    C0] R10: ffffffff88e7aa60 R11: ffffffff88e7a1c0 R12: ffffffff88fbaa08
[  238.059837][    C0] R13: ffffffff81675fd5 R14: ffff8880ae809ed0 R15: 0000000000000000
[  238.059842][    C0] FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
[  238.059846][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  238.059851][    C0] CR2: 0000000001e32000 CR3: 00000000a1a5c000 CR4: 00000000001406f0
[  238.059855][    C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  238.059860][    C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  238.059862][    C0] Call Trace:
[  238.059864][    C0]  <IRQ>
[  238.059868][    C0]  lock_release+0x1a1/0x960
[  238.059871][    C0]  ? lock_downgrade+0x920/0x920
[  238.059874][    C0]  ? lock_acquire+0x190/0x410
[  238.059877][    C0]  ? tick_irq_enter+0xb5/0x3f0
[  238.059880][    C0]  ktime_get+0xe2/0x2f0
[  238.059883][    C0]  ? tick_irq_enter+0xb5/0x3f0
[  238.059887][    C0]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[  238.059890][    C0]  tick_irq_enter+0xb5/0x3f0
[  238.059893][    C0]  irq_enter+0xbd/0xe0
[  238.059897][    C0]  smp_apic_timer_interrupt+0x3f/0x610
[  238.059900][    C0]  apic_timer_interrupt+0xf/0x20
[  238.059902][    C0]  </IRQ>
[  238.059905][    C0] RIP: 0010:native_safe_halt+0xe/0x10
[  238.059915][    C0] Code: a8 f4 59 fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 04 06 53 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d f4 05 53 00 fb f4 <c3> 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 3e d4 0b fa e8 79
[  238.059918][    C0] RSP: 0018:ffffffff88e07ce8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
[  238.059926][    C0] RAX: 1ffffffff11e643f RBX: ffffffff88e7a1c0 RCX: 0000000000000000
[  238.059931][    C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff88e7aa5c
[  238.059935][    C0] RBP: ffffffff88e07d18 R08: ffffffff88e7a1c0 R09: 0000000000000000
[  238.059940][    C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
[  238.059944][    C0] R13: ffffffff89c828c0 R14: 0000000000000000 R15: 0000000000000000
[  238.059948][    C0]  ? default_idle+0x4e/0x360
[  238.059951][    C0]  arch_cpu_idle+0xa/0x10
[  238.059954][    C0]  default_idle_call+0x84/0xb0
[  238.059957][    C0]  do_idle+0x3b7/0x6e0
[  238.059960][    C0]  ? arch_cpu_idle_exit+0x80/0x80
[  238.059964][    C0]  ? trace_hardirqs_on+0x67/0x240
[  238.059967][    C0]  ? __kasan_check_read+0x11/0x20
[  238.059971][    C0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[  238.059974][    C0]  ? debug_smp_processor_id+0x33/0x18a
[  238.059982][    C0]  cpu_startup_entry+0x1b/0x20
[  238.059985][    C0]  rest_init+0x23b/0x371
[  238.059988][    C0]  arch_call_rest_init+0xe/0x1b
[  238.059991][    C0]  start_kernel+0x904/0x943
[  238.059994][    C0]  ? mem_encrypt_init+0xb/0xb
[  238.059998][    C0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[  238.060001][    C0]  ? x86_family+0x41/0x50
[  238.060005][    C0]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[  238.060008][    C0]  x86_64_start_reservations+0x29/0x2b
[  238.060012][    C0]  x86_64_start_kernel+0x77/0x7b
[  238.060015][    C0]  secondary_startup_64+0xa4/0xb0
[  238.061336][  T951] Kernel panic - not syncing: hung_task: blocked tasks
[  238.435911][  T951] CPU: 1 PID: 951 Comm: khungtaskd Not tainted 5.4.0-rc4-next-20191025 #0
[  238.444398][  T951] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  238.454452][  T951] Call Trace:
[  238.457736][  T951]  dump_stack+0x172/0x1f0
[  238.462047][  T951]  panic+0x2e3/0x75c
[  238.465927][  T951]  ? add_taint.cold+0x16/0x16
[  238.470593][  T951]  ? lapic_can_unplug_cpu.cold+0x3a/0x3a
[  238.476327][  T951]  ? ___preempt_schedule+0x16/0x18
[  238.481440][  T951]  ? nmi_trigger_cpumask_backtrace+0x21b/0x28b
[  238.487571][  T951]  ? nmi_trigger_cpumask_backtrace+0x24c/0x28b
[  238.493711][  T951]  ? nmi_trigger_cpumask_backtrace+0x256/0x28b
[  238.499859][  T951]  ? nmi_trigger_cpumask_backtrace+0x21b/0x28b
[  238.505996][  T951]  watchdog+0xca0/0x1350
[  238.510233][  T951]  kthread+0x361/0x430
[  238.515844][  T951]  ? reset_hung_task_detector+0x30/0x30
[  238.521378][  T951]  ? kthread_mod_delayed_work+0x1f0/0x1f0
[  238.527277][  T951]  ret_from_fork+0x24/0x30
[  238.535485][  T951] Kernel Offset: disabled
[  238.539858][  T951] Rebooting in 86400 seconds..