[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 1001.335470] INFO: task syz-executor139:7978 blocked for more than 140 seconds.
[ 1001.342910]       Not tainted 4.14.273-syzkaller #0
[ 1001.348138] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.356241] syz-executor139 D28568  7978   7976 0x00000004
[ 1001.361857] Call Trace:
[ 1001.364431]  __schedule+0x88b/0x1de0
[ 1001.368201]  ? lock_acquire+0x170/0x3f0
[ 1001.372242]  ? io_schedule_timeout+0x140/0x140
[ 1001.376873]  ? _raw_spin_unlock+0x29/0x40
[ 1001.381011]  ? fuse_writepage_locked+0xe80/0xe80
[ 1001.385803]  schedule+0x8d/0x1b0
[ 1001.389164]  fuse_wait_on_page_writeback.isra.0+0xdc/0x120
[ 1001.394786]  ? fuse_do_ioctl+0x1570/0x1570
[ 1001.399083]  ? end_page_writeback+0xe3/0x1c0
[ 1001.403487]  ? wait_woken+0x230/0x230
[ 1001.407338]  fuse_launder_page+0xa2/0xd0
[ 1001.411394]  invalidate_inode_pages2_range+0x547/0xc00
[ 1001.416727]  ? clear_shadow_entry+0x160/0x160
[ 1001.421214]  ? fuse_range_is_writeback+0x1f0/0x1f0
[ 1001.426702]  ? fuse_file_alloc+0x1ca/0x260
[ 1001.430940]  ? _raw_spin_unlock+0x29/0x40
[ 1001.435101]  ? fuse_do_open+0x18e/0x460
[ 1001.439223]  fuse_finish_open+0x262/0x500
[ 1001.443368]  fuse_open_common+0x234/0x290
[ 1001.447560]  do_dentry_open+0x44b/0xec0
[ 1001.451532]  ? fuse_open_common+0x290/0x290
[ 1001.455908]  ? __inode_permission+0xcd/0x2f0
[ 1001.460328]  vfs_open+0x105/0x220
[ 1001.463764]  path_openat+0x628/0x2970
[ 1001.467717]  ? path_lookupat+0x780/0x780
[ 1001.471773]  ? trace_hardirqs_on+0x10/0x10
[ 1001.476057]  do_filp_open+0x179/0x3c0
[ 1001.479848]  ? may_open_dev+0xe0/0xe0
[ 1001.483633]  ? lock_downgrade+0x740/0x740
[ 1001.487821]  ? do_raw_spin_unlock+0x164/0x220
[ 1001.492313]  ? _raw_spin_unlock+0x29/0x40
[ 1001.496515]  ? __alloc_fd+0x1be/0x490
[ 1001.500316]  do_sys_open+0x296/0x410
[ 1001.504046]  ? filp_open+0x60/0x60
[ 1001.507628]  ? do_syscall_64+0x4c/0x640
[ 1001.511619]  ? compat_SyS_openat+0x30/0x30
[ 1001.515899]  do_syscall_64+0x1d5/0x640
[ 1001.519777]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.524945] RIP: 0033:0x7f7c7ae444c9
[ 1001.528690] RSP: 002b:00007f7c7adf52f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
[ 1001.536462] RAX: ffffffffffffffda RBX: 00007f7c7aed54c0 RCX: 00007f7c7ae444c9
[ 1001.543715] RDX: 00007f7c7ae444c9 RSI: 0000000000000000 RDI: 00000000200001c0
[ 1001.551018] RBP: 00007f7c7aea2164 R08: 0000000000000000 R09: 0000000000000000
[ 1001.558674] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
[ 1001.565973] R13: 00007f7c7ae9e158 R14: 00007f7c7aea0160 R15: 00007f7c7aed54c8
[ 1001.573275] 
[ 1001.573275] Showing all locks held in the system:
[ 1001.579651] 1 lock held by khungtaskd/1533:
[ 1001.584041]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff8702311c>] debug_show_all_locks+0x7c/0x21a
[ 1001.593142] 2 locks held by syz-executor139/7978:
[ 1001.598053]  #0:  (sb_writers#10){.+.+}, at: [<ffffffff818df1da>] mnt_want_write+0x3a/0xb0
[ 1001.606514]  #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff822f1dd4>] fuse_open_common+0x1a4/0x290
[ 1001.616553] 
[ 1001.618172] =============================================
[ 1001.618172] 
[ 1001.625483] NMI backtrace for cpu 0
[ 1001.629100] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.273-syzkaller #0
[ 1001.636664] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.646009] Call Trace:
[ 1001.648581]  dump_stack+0x1b2/0x281
[ 1001.652186]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.656659]  ? irq_force_complete_move+0x350/0x350
[ 1001.661582]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.666836]  watchdog+0x5b9/0xb40
[ 1001.670268]  ? hungtask_pm_notify+0x50/0x50
[ 1001.674565]  kthread+0x30d/0x420
[ 1001.677907]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.682556]  ret_from_fork+0x24/0x30
[ 1001.686366] Sending NMI from CPU 0 to CPUs 1:
[ 1001.690915] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8724332e
[ 1001.692362] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.704241] CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.273-syzkaller #0
[ 1001.711660] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.720990] Call Trace:
[ 1001.723556]  dump_stack+0x1b2/0x281
[ 1001.727179]  panic+0x1f9/0x42d
[ 1001.730351]  ? add_taint.cold+0x16/0x16
[ 1001.734303]  watchdog+0x5ca/0xb40
[ 1001.737733]  ? hungtask_pm_notify+0x50/0x50
[ 1001.742032]  kthread+0x30d/0x420
[ 1001.745371]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.750016]  ret_from_fork+0x24/0x30
[ 1001.753894] Kernel Offset: disabled
[ 1001.757510] Rebooting in 86400 seconds..