[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 1001.318282] INFO: task syz-executor328:7987 blocked for more than 140 seconds.
[ 1001.325707]       Not tainted 4.14.272-syzkaller #0
[ 1001.332461] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.340859] syz-executor328 D28240  7987   7985 0x00000004
[ 1001.346482] Call Trace:
[ 1001.349653]  __schedule+0x88b/0x1de0
[ 1001.353360]  ? lock_acquire+0x170/0x3f0
[ 1001.357310]  ? io_schedule_timeout+0x140/0x140
[ 1001.362661]  ? _raw_spin_unlock+0x29/0x40
[ 1001.366801]  ? fuse_writepage_locked+0xe80/0xe80
[ 1001.372189]  schedule+0x8d/0x1b0
[ 1001.375564]  fuse_wait_on_page_writeback.isra.0+0xdc/0x120
[ 1001.381762]  ? fuse_do_ioctl+0x1570/0x1570
[ 1001.385988]  ? end_page_writeback+0xe3/0x1c0
[ 1001.390974]  ? wait_woken+0x230/0x230
[ 1001.394767]  fuse_launder_page+0xa2/0xd0
[ 1001.399374]  invalidate_inode_pages2_range+0x547/0xc00
[ 1001.404640]  ? clear_shadow_entry+0x160/0x160
[ 1001.410473]  ? fuse_range_is_writeback+0x1f0/0x1f0
[ 1001.415406]  ? fuse_file_alloc+0x1ca/0x260
[ 1001.420221]  ? _raw_spin_unlock+0x29/0x40
[ 1001.424364]  ? fuse_do_open+0x18e/0x460
[ 1001.428919]  fuse_finish_open+0x262/0x500
[ 1001.433056]  fuse_open_common+0x234/0x290
[ 1001.437210]  do_dentry_open+0x44b/0xec0
[ 1001.441924]  ? fuse_open_common+0x290/0x290
[ 1001.446240]  ? __inode_permission+0xcd/0x2f0
[ 1001.451263]  vfs_open+0x105/0x220
[ 1001.454711]  path_openat+0x628/0x2970
[ 1001.459034]  ? path_lookupat+0x780/0x780
[ 1001.463102]  ? trace_hardirqs_on+0x10/0x10
[ 1001.467317]  do_filp_open+0x179/0x3c0
[ 1001.471850]  ? may_open_dev+0xe0/0xe0
[ 1001.475642]  ? lock_downgrade+0x740/0x740
[ 1001.480305]  ? do_raw_spin_unlock+0x164/0x220
[ 1001.484788]  ? _raw_spin_unlock+0x29/0x40
[ 1001.489490]  ? __alloc_fd+0x1be/0x490
[ 1001.493293]  do_sys_open+0x296/0x410
[ 1001.496985]  ? filp_open+0x60/0x60
[ 1001.501238]  ? do_syscall_64+0x4c/0x640
[ 1001.505197]  ? compat_SyS_openat+0x30/0x30
[ 1001.509934]  do_syscall_64+0x1d5/0x640
[ 1001.513809]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.519537] RIP: 0033:0x7f386f0c64c9
[ 1001.523233] RSP: 002b:00007f386f0772f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
[ 1001.531498] RAX: ffffffffffffffda RBX: 00007f386f1574c0 RCX: 00007f386f0c64c9
[ 1001.539100] RDX: 00007f386f0c64c9 RSI: 0000000000000000 RDI: 00000000200001c0
[ 1001.546355] RBP: 00007f386f124164 R08: 0000000000000000 R09: 0000000000000000
[ 1001.554195] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
[ 1001.561862] R13: 00007f386f120158 R14: 00007f386f122160 R15: 00007f386f1574c8
[ 1001.569482] 
[ 1001.569482] Showing all locks held in the system:
[ 1001.575801] 1 lock held by khungtaskd/1531:
[ 1001.580227]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff8702281c>] debug_show_all_locks+0x7c/0x21a
[ 1001.589351] 1 lock held by in:imklog/7704:
[ 1001.593563]  #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff818d616b>] __fdget_pos+0x1fb/0x2b0
[ 1001.602071] 2 locks held by syz-executor328/7987:
[ 1001.606900]  #0:  (sb_writers#10){.+.+}, at: [<ffffffff818df1da>] mnt_want_write+0x3a/0xb0
[ 1001.615383]  #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff822f1de4>] fuse_open_common+0x1a4/0x290
[ 1001.625492] 
[ 1001.627099] =============================================
[ 1001.627099] 
[ 1001.634615] NMI backtrace for cpu 1
[ 1001.638314] CPU: 1 PID: 1531 Comm: khungtaskd Not tainted 4.14.272-syzkaller #0
[ 1001.645762] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.655093] Call Trace:
[ 1001.657659]  dump_stack+0x1b2/0x281
[ 1001.661267]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.665741]  ? irq_force_complete_move+0x350/0x350
[ 1001.670647]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.675900]  watchdog+0x5b9/0xb40
[ 1001.679331]  ? hungtask_pm_notify+0x50/0x50
[ 1001.683633]  kthread+0x30d/0x420
[ 1001.686976]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.691619]  ret_from_fork+0x24/0x30
[ 1001.695456] Sending NMI from CPU 1 to CPUs 0:
[ 1001.700026] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff87242a2e
[ 1001.701079] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.713348] CPU: 1 PID: 1531 Comm: khungtaskd Not tainted 4.14.272-syzkaller #0
[ 1001.720770] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.730099] Call Trace:
[ 1001.732669]  dump_stack+0x1b2/0x281
[ 1001.736273]  panic+0x1f9/0x42d
[ 1001.739439]  ? add_taint.cold+0x16/0x16
[ 1001.743396]  watchdog+0x5ca/0xb40
[ 1001.746838]  ? hungtask_pm_notify+0x50/0x50
[ 1001.751149]  kthread+0x30d/0x420
[ 1001.754493]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.759147]  ret_from_fork+0x24/0x30
[ 1001.763108] Kernel Offset: disabled
[ 1001.766718] Rebooting in 86400 seconds..