[  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 '10.128.1.81' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 1001.349040] INFO: task syz-executor125:7987 blocked for more than 140 seconds.
[ 1001.356463]       Not tainted 4.14.275-syzkaller #0
[ 1001.362515] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.370530] syz-executor125 D27840  7987   7985 0x00000004
[ 1001.376160] Call Trace:
[ 1001.378729]  __schedule+0x88b/0x1de0
[ 1001.383030]  ? lock_acquire+0x170/0x3f0
[ 1001.387012]  ? io_schedule_timeout+0x140/0x140
[ 1001.391670]  ? _raw_spin_unlock+0x29/0x40
[ 1001.395822]  ? fuse_writepage_locked+0xe80/0xe80
[ 1001.400709]  schedule+0x8d/0x1b0
[ 1001.404083]  fuse_wait_on_page_writeback.isra.0+0xdc/0x120
[ 1001.409816]  ? fuse_do_ioctl+0x1570/0x1570
[ 1001.414063]  ? end_page_writeback+0xe3/0x1c0
[ 1001.418466]  ? wait_woken+0x230/0x230
[ 1001.422318]  fuse_launder_page+0xa2/0xd0
[ 1001.426466]  invalidate_inode_pages2_range+0x547/0xc00
[ 1001.431793]  ? clear_shadow_entry+0x160/0x160
[ 1001.436281]  ? fuse_range_is_writeback+0x1f0/0x1f0
[ 1001.441268]  ? fuse_file_alloc+0x1ca/0x260
[ 1001.445518]  ? _raw_spin_unlock+0x29/0x40
[ 1001.449723]  ? fuse_do_open+0x18e/0x460
[ 1001.453713]  fuse_finish_open+0x262/0x500
[ 1001.457873]  fuse_open_common+0x234/0x290
[ 1001.462071]  do_dentry_open+0x44b/0xec0
[ 1001.466115]  ? fuse_open_common+0x290/0x290
[ 1001.471037]  ? __inode_permission+0xcd/0x2f0
[ 1001.475449]  vfs_open+0x105/0x220
[ 1001.478952]  path_openat+0x628/0x2970
[ 1001.482749]  ? path_lookupat+0x780/0x780
[ 1001.486811]  ? trace_hardirqs_on+0x10/0x10
[ 1001.491115]  do_filp_open+0x179/0x3c0
[ 1001.494918]  ? may_open_dev+0xe0/0xe0
[ 1001.498701]  ? lock_downgrade+0x740/0x740
[ 1001.502912]  ? do_raw_spin_unlock+0x164/0x220
[ 1001.507491]  ? _raw_spin_unlock+0x29/0x40
[ 1001.512205]  ? __alloc_fd+0x1be/0x490
[ 1001.516010]  do_sys_open+0x296/0x410
[ 1001.519904]  ? filp_open+0x60/0x60
[ 1001.523443]  ? do_syscall_64+0x4c/0x640
[ 1001.527402]  ? do_sys_open+0x410/0x410
[ 1001.531349]  do_syscall_64+0x1d5/0x640
[ 1001.535265]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.540487] RIP: 0033:0x7f4b48e764c9
[ 1001.544201] RSP: 002b:00007f4b48e272f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
[ 1001.552170] RAX: ffffffffffffffda RBX: 00007f4b48f074c0 RCX: 00007f4b48e764c9
[ 1001.559497] RDX: 0000000000000000 RSI: 0000000000000700 RDI: 0000000020000100
[ 1001.566917] RBP: 00007f4b48ed4164 R08: 0000000000000000 R09: 0000000000000000
[ 1001.574420] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
[ 1001.581838] R13: 00007f4b48ed0158 R14: 00007f4b48ed2160 R15: 00007f4b48f074c8
[ 1001.589178] 
[ 1001.589178] Showing all locks held in the system:
[ 1001.595579] 1 lock held by khungtaskd/1529:
[ 1001.599994]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff87022f4c>] debug_show_all_locks+0x7c/0x21a
[ 1001.609127] 1 lock held by in:imklog/7709:
[ 1001.613347]  #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff818d616b>] __fdget_pos+0x1fb/0x2b0
[ 1001.621828] 2 locks held by syz-executor125/7987:
[ 1001.626661]  #0:  (sb_writers#10){.+.+}, at: [<ffffffff818df1da>] mnt_want_write+0x3a/0xb0
[ 1001.635131]  #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff822f1dd4>] fuse_open_common+0x1a4/0x290
[ 1001.645240] 
[ 1001.646860] =============================================
[ 1001.646860] 
[ 1001.654411] NMI backtrace for cpu 0
[ 1001.658038] CPU: 0 PID: 1529 Comm: khungtaskd Not tainted 4.14.275-syzkaller #0
[ 1001.665460] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.674802] Call Trace:
[ 1001.677384]  dump_stack+0x1b2/0x281
[ 1001.680992]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.685484]  ? irq_force_complete_move+0x350/0x350
[ 1001.690391]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.695646]  watchdog+0x5b9/0xb40
[ 1001.699077]  ? hungtask_pm_notify+0x50/0x50
[ 1001.703390]  kthread+0x30d/0x420
[ 1001.706743]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.711399]  ret_from_fork+0x24/0x30
[ 1001.715312] Sending NMI from CPU 0 to CPUs 1:
[ 1001.719882] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8724315e
[ 1001.720853] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.733312] CPU: 0 PID: 1529 Comm: khungtaskd Not tainted 4.14.275-syzkaller #0
[ 1001.740730] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.750064] Call Trace:
[ 1001.752642]  dump_stack+0x1b2/0x281
[ 1001.756267]  panic+0x1f9/0x42d
[ 1001.759443]  ? add_taint.cold+0x16/0x16
[ 1001.763402]  watchdog+0x5ca/0xb40
[ 1001.766857]  ? hungtask_pm_notify+0x50/0x50
[ 1001.771183]  kthread+0x30d/0x420
[ 1001.774548]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.779208]  ret_from_fork+0x24/0x30
[ 1001.783527] Kernel Offset: disabled
[ 1001.787160] Rebooting in 86400 seconds..