[  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 '10.128.1.47' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 1001.318712] INFO: task syz-executor235:7990 blocked for more than 140 seconds.
[ 1001.326131]       Not tainted 4.14.272-syzkaller #0
[ 1001.331447] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.339596] syz-executor235 D28560  7990   7988 0x00000004
[ 1001.345214] Call Trace:
[ 1001.347792]  __schedule+0x88b/0x1de0
[ 1001.351553]  ? lock_acquire+0x170/0x3f0
[ 1001.355528]  ? io_schedule_timeout+0x140/0x140
[ 1001.360157]  ? _raw_spin_unlock+0x29/0x40
[ 1001.364319]  ? fuse_writepage_locked+0xe80/0xe80
[ 1001.369123]  schedule+0x8d/0x1b0
[ 1001.372483]  fuse_wait_on_page_writeback.isra.0+0xdc/0x120
[ 1001.378084]  ? fuse_do_ioctl+0x1570/0x1570
[ 1001.382369]  ? end_page_writeback+0xe3/0x1c0
[ 1001.386769]  ? wait_woken+0x230/0x230
[ 1001.391151]  fuse_launder_page+0xa2/0xd0
[ 1001.395213]  invalidate_inode_pages2_range+0x547/0xc00
[ 1001.400643]  ? clear_shadow_entry+0x160/0x160
[ 1001.405130]  ? fuse_range_is_writeback+0x1f0/0x1f0
[ 1001.410195]  ? fuse_file_alloc+0x1ca/0x260
[ 1001.414421]  ? _raw_spin_unlock+0x29/0x40
[ 1001.418606]  ? fuse_do_open+0x18e/0x460
[ 1001.422569]  fuse_finish_open+0x262/0x500
[ 1001.426691]  fuse_open_common+0x234/0x290
[ 1001.430887]  do_dentry_open+0x44b/0xec0
[ 1001.434853]  ? fuse_open_common+0x290/0x290
[ 1001.439210]  ? __inode_permission+0xcd/0x2f0
[ 1001.443616]  vfs_open+0x105/0x220
[ 1001.447051]  path_openat+0x628/0x2970
[ 1001.450902]  ? path_lookupat+0x780/0x780
[ 1001.454950]  ? trace_hardirqs_on+0x10/0x10
[ 1001.459233]  do_filp_open+0x179/0x3c0
[ 1001.463020]  ? may_open_dev+0xe0/0xe0
[ 1001.466804]  ? lock_downgrade+0x740/0x740
[ 1001.471003]  ? do_raw_spin_unlock+0x164/0x220
[ 1001.475487]  ? _raw_spin_unlock+0x29/0x40
[ 1001.479683]  ? __alloc_fd+0x1be/0x490
[ 1001.483477]  do_sys_open+0x296/0x410
[ 1001.487167]  ? filp_open+0x60/0x60
[ 1001.490754]  ? do_syscall_64+0x4c/0x640
[ 1001.494722]  ? compat_SyS_openat+0x30/0x30
[ 1001.498997]  do_syscall_64+0x1d5/0x640
[ 1001.502874]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.508039] RIP: 0033:0x7f87e34004c9
[ 1001.511929] RSP: 002b:00007f87e33b12f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
[ 1001.520086] RAX: ffffffffffffffda RBX: 00007f87e34914c0 RCX: 00007f87e34004c9
[ 1001.527424] RDX: 00007f87e34004c9 RSI: 0000000000000000 RDI: 00000000200001c0
[ 1001.534737] RBP: 00007f87e345e164 R08: 0000000000000000 R09: 0000000000000000
[ 1001.542061] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
[ 1001.549363] R13: 00007f87e345a158 R14: 00007f87e345c160 R15: 00007f87e34914c8
[ 1001.556650] 
[ 1001.556650] Showing all locks held in the system:
[ 1001.563030] 1 lock held by khungtaskd/1532:
[ 1001.567416]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff8702281c>] debug_show_all_locks+0x7c/0x21a
[ 1001.576530] 2 locks held by syz-executor235/7990:
[ 1001.581439]  #0:  (sb_writers#10){.+.+}, at: [<ffffffff818df1da>] mnt_want_write+0x3a/0xb0
[ 1001.589900]  #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff822f1de4>] fuse_open_common+0x1a4/0x290
[ 1001.600023] 
[ 1001.601639] =============================================
[ 1001.601639] 
[ 1001.608689] NMI backtrace for cpu 1
[ 1001.612307] CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.272-syzkaller #0
[ 1001.619726] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.629051] Call Trace:
[ 1001.631614]  dump_stack+0x1b2/0x281
[ 1001.635216]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.639683]  ? irq_force_complete_move+0x350/0x350
[ 1001.644588]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.649838]  watchdog+0x5b9/0xb40
[ 1001.653263]  ? hungtask_pm_notify+0x50/0x50
[ 1001.657558]  kthread+0x30d/0x420
[ 1001.660896]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.665538]  ret_from_fork+0x24/0x30
[ 1001.669331] Sending NMI from CPU 1 to CPUs 0:
[ 1001.673866] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff87242a2e
[ 1001.675325] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.687184] CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.272-syzkaller #0
[ 1001.694602] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.703934] Call Trace:
[ 1001.706501]  dump_stack+0x1b2/0x281
[ 1001.710106]  panic+0x1f9/0x42d
[ 1001.713277]  ? add_taint.cold+0x16/0x16
[ 1001.717229]  watchdog+0x5ca/0xb40
[ 1001.720659]  ? hungtask_pm_notify+0x50/0x50
[ 1001.724954]  kthread+0x30d/0x420
[ 1001.728297]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.732939]  ret_from_fork+0x24/0x30
[ 1001.736902] Kernel Offset: disabled
[ 1001.740513] Rebooting in 86400 seconds..