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

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.154' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 1001.353673] INFO: task syz-executor126:7984 blocked for more than 140 seconds.
[ 1001.361095]       Not tainted 4.14.275-syzkaller #0
[ 1001.367445] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.375754] syz-executor126 D28696  7984   7979 0x00000004
[ 1001.381388] Call Trace:
[ 1001.384534]  __schedule+0x88b/0x1de0
[ 1001.388258]  ? lock_acquire+0x170/0x3f0
[ 1001.392209]  ? io_schedule_timeout+0x140/0x140
[ 1001.397536]  ? _raw_spin_unlock+0x29/0x40
[ 1001.401679]  ? fuse_writepage_locked+0xe80/0xe80
[ 1001.407019]  schedule+0x8d/0x1b0
[ 1001.410389]  fuse_wait_on_page_writeback.isra.0+0xdc/0x120
[ 1001.416536]  ? fuse_do_ioctl+0x1570/0x1570
[ 1001.420759]  ? end_page_writeback+0xe3/0x1c0
[ 1001.425698]  ? wait_woken+0x230/0x230
[ 1001.429485]  fuse_launder_page+0xa2/0xd0
[ 1001.434065]  invalidate_inode_pages2_range+0x547/0xc00
[ 1001.439328]  ? clear_shadow_entry+0x160/0x160
[ 1001.444411]  ? fuse_range_is_writeback+0x1f0/0x1f0
[ 1001.449323]  ? fuse_file_alloc+0x1ca/0x260
[ 1001.453958]  ? _raw_spin_unlock+0x29/0x40
[ 1001.458095]  ? fuse_do_open+0x18e/0x460
[ 1001.462061]  fuse_finish_open+0x262/0x500
[ 1001.466246]  fuse_open_common+0x234/0x290
[ 1001.470377]  do_dentry_open+0x44b/0xec0
[ 1001.474403]  ? fuse_open_common+0x290/0x290
[ 1001.478722]  ? __inode_permission+0xcd/0x2f0
[ 1001.483109]  vfs_open+0x105/0x220
[ 1001.486586]  path_openat+0x628/0x2970
[ 1001.490379]  ? path_lookupat+0x780/0x780
[ 1001.495013]  ? trace_hardirqs_on+0x10/0x10
[ 1001.499236]  do_filp_open+0x179/0x3c0
[ 1001.503017]  ? may_open_dev+0xe0/0xe0
[ 1001.506837]  ? lock_downgrade+0x740/0x740
[ 1001.511060]  ? do_raw_spin_unlock+0x164/0x220
[ 1001.515604]  ? _raw_spin_unlock+0x29/0x40
[ 1001.519741]  ? __alloc_fd+0x1be/0x490
[ 1001.523571]  do_sys_open+0x296/0x410
[ 1001.527270]  ? filp_open+0x60/0x60
[ 1001.530786]  ? do_syscall_64+0x4c/0x640
[ 1001.534804]  ? compat_SyS_openat+0x30/0x30
[ 1001.539039]  do_syscall_64+0x1d5/0x640
[ 1001.542905]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.548116] RIP: 0033:0x7fd11c48d4c9
[ 1001.551812] RSP: 002b:00007fd11c41d2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
[ 1001.559576] RAX: ffffffffffffffda RBX: 00007fd11c51e4d0 RCX: 00007fd11c48d4c9
[ 1001.566970] RDX: 00007fd11c48d4c9 RSI: 0000000000000000 RDI: 0000000020000140
[ 1001.574294] RBP: 00007fd11c4eb164 R08: 0000000000000000 R09: 0000000000000000
[ 1001.581547] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
[ 1001.588847] R13: 00007fd11c4e7158 R14: 00007fd11c4e9160 R15: 00007fd11c51e4d8
[ 1001.596192] 
[ 1001.596192] Showing all locks held in the system:
[ 1001.602500] 1 lock held by khungtaskd/1532:
[ 1001.606906]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff87022f4c>] debug_show_all_locks+0x7c/0x21a
[ 1001.616010] 1 lock held by in:imklog/7685:
[ 1001.620219]  #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff818d616b>] __fdget_pos+0x1fb/0x2b0
[ 1001.628673] 2 locks held by syz-executor126/7984:
[ 1001.633549]  #0:  (sb_writers#10){.+.+}, at: [<ffffffff818df1da>] mnt_want_write+0x3a/0xb0
[ 1001.641967]  #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff822f1dd4>] fuse_open_common+0x1a4/0x290
[ 1001.651989] 
[ 1001.653675] =============================================
[ 1001.653675] 
[ 1001.660987] NMI backtrace for cpu 0
[ 1001.664839] CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.275-syzkaller #0
[ 1001.672269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.681609] Call Trace:
[ 1001.684178]  dump_stack+0x1b2/0x281
[ 1001.687782]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.692252]  ? irq_force_complete_move+0x350/0x350
[ 1001.697516]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.702769]  watchdog+0x5b9/0xb40
[ 1001.706196]  ? hungtask_pm_notify+0x50/0x50
[ 1001.710579]  kthread+0x30d/0x420
[ 1001.713920]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.718563]  ret_from_fork+0x24/0x30
[ 1001.722329] Sending NMI from CPU 0 to CPUs 1:
[ 1001.726888] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8724315e
[ 1001.734232] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.740357] CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.275-syzkaller #0
[ 1001.747828] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.757158] Call Trace:
[ 1001.759736]  dump_stack+0x1b2/0x281
[ 1001.763340]  panic+0x1f9/0x42d
[ 1001.766544]  ? add_taint.cold+0x16/0x16
[ 1001.770499]  watchdog+0x5ca/0xb40
[ 1001.773949]  ? hungtask_pm_notify+0x50/0x50
[ 1001.778242]  kthread+0x30d/0x420
[ 1001.781592]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.786238]  ret_from_fork+0x24/0x30
[ 1001.790201] Kernel Offset: disabled
[ 1001.793810] Rebooting in 86400 seconds..