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

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.15.198' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 1001.347995] INFO: task syz-executor406:7968 blocked for more than 140 seconds.
[ 1001.355481]       Not tainted 4.14.281-syzkaller #0
[ 1001.361766] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.370311] syz-executor406 D28128  7968   7966 0x00000004
[ 1001.376120] Call Trace:
[ 1001.379383]  __schedule+0x88b/0x1de0
[ 1001.383099]  ? lock_acquire+0x170/0x3f0
[ 1001.387060]  ? io_schedule_timeout+0x140/0x140
[ 1001.392403]  ? _raw_spin_unlock+0x29/0x40
[ 1001.396544]  ? fuse_writepage_locked+0xe80/0xe80
[ 1001.401936]  schedule+0x8d/0x1b0
[ 1001.405294]  fuse_wait_on_page_writeback.isra.0+0xdc/0x120
[ 1001.411450]  ? fuse_do_ioctl+0x1570/0x1570
[ 1001.415673]  ? end_page_writeback+0xe3/0x1c0
[ 1001.420581]  ? wait_woken+0x230/0x230
[ 1001.424377]  fuse_launder_page+0xa2/0xd0
[ 1001.429256]  invalidate_inode_pages2_range+0x547/0xc00
[ 1001.434522]  ? clear_shadow_entry+0x160/0x160
[ 1001.439524]  ? fuse_range_is_writeback+0x1f0/0x1f0
[ 1001.444442]  ? fuse_file_alloc+0x1ca/0x260
[ 1001.449194]  ? _raw_spin_unlock+0x29/0x40
[ 1001.453331]  ? fuse_do_open+0x18e/0x460
[ 1001.457297]  fuse_finish_open+0x262/0x500
[ 1001.462182]  fuse_open_common+0x234/0x290
[ 1001.466317]  do_dentry_open+0x44b/0xec0
[ 1001.470778]  ? fuse_open_common+0x290/0x290
[ 1001.475284]  ? __inode_permission+0xcd/0x2f0
[ 1001.480264]  vfs_open+0x105/0x220
[ 1001.483715]  path_openat+0x628/0x2970
[ 1001.487495]  ? path_lookupat+0x780/0x780
[ 1001.492283]  ? trace_hardirqs_on+0x10/0x10
[ 1001.496507]  do_filp_open+0x179/0x3c0
[ 1001.500911]  ? may_open_dev+0xe0/0xe0
[ 1001.504706]  ? lock_downgrade+0x740/0x740
[ 1001.510044]  ? do_raw_spin_unlock+0x164/0x220
[ 1001.514531]  ? _raw_spin_unlock+0x29/0x40
[ 1001.519210]  ? __alloc_fd+0x1be/0x490
[ 1001.523118]  do_sys_open+0x296/0x410
[ 1001.526815]  ? filp_open+0x60/0x60
[ 1001.531075]  ? do_syscall_64+0x4c/0x640
[ 1001.535036]  ? compat_SyS_openat+0x30/0x30
[ 1001.539779]  do_syscall_64+0x1d5/0x640
[ 1001.543663]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.549439] RIP: 0033:0x7f06a6c134c9
[ 1001.553134] RSP: 002b:00007f06a6bc42f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
[ 1001.561695] RAX: ffffffffffffffda RBX: 00007f06a6ca44c0 RCX: 00007f06a6c134c9
[ 1001.569286] RDX: 00007f06a6c134c9 RSI: 0000000000000140 RDI: 00000000200001c0
[ 1001.576545] RBP: 00007f06a6c71164 R08: 0000000000000000 R09: 0000000000000000
[ 1001.584326] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
[ 1001.592004] R13: 00007f06a6c6d158 R14: 00007f06a6c6f160 R15: 00007f06a6ca44c8
[ 1001.599642] 
[ 1001.599642] Showing all locks held in the system:
[ 1001.605959] 1 lock held by khungtaskd/1528:
[ 1001.610353]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff87026b7c>] debug_show_all_locks+0x7c/0x21a
[ 1001.619468] 1 lock held by in:imklog/7677:
[ 1001.623681]  #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff818d6ceb>] __fdget_pos+0x1fb/0x2b0
[ 1001.632179] 2 locks held by syz-executor406/7968:
[ 1001.637006]  #0:  (sb_writers#10){.+.+}, at: [<ffffffff818dfd5a>] mnt_want_write+0x3a/0xb0
[ 1001.646079]  #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff822f2e34>] fuse_open_common+0x1a4/0x290
[ 1001.656171] 
[ 1001.657821] =============================================
[ 1001.657821] 
[ 1001.664905] NMI backtrace for cpu 1
[ 1001.668625] CPU: 1 PID: 1528 Comm: khungtaskd Not tainted 4.14.281-syzkaller #0
[ 1001.676051] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.686684] Call Trace:
[ 1001.689256]  dump_stack+0x1b2/0x281
[ 1001.692862]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.697333]  ? irq_force_complete_move+0x350/0x350
[ 1001.702260]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.707520]  watchdog+0x5b9/0xb40
[ 1001.710963]  ? hungtask_pm_notify+0x50/0x50
[ 1001.715262]  kthread+0x30d/0x420
[ 1001.718602]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.723246]  ret_from_fork+0x24/0x30
[ 1001.727080] Sending NMI from CPU 1 to CPUs 0:
[ 1001.731659] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff87246b5e
[ 1001.732643] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.744982] CPU: 1 PID: 1528 Comm: khungtaskd Not tainted 4.14.281-syzkaller #0
[ 1001.754399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.763814] Call Trace:
[ 1001.766384]  dump_stack+0x1b2/0x281
[ 1001.770160]  panic+0x1f9/0x42d
[ 1001.773338]  ? add_taint.cold+0x16/0x16
[ 1001.777291]  watchdog+0x5ca/0xb40
[ 1001.780737]  ? hungtask_pm_notify+0x50/0x50
[ 1001.785034]  kthread+0x30d/0x420
[ 1001.788376]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.793025]  ret_from_fork+0x24/0x30
[ 1001.796888] Kernel Offset: disabled
[ 1001.800504] Rebooting in 86400 seconds..