[  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 '10.128.1.248' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 1001.353288] INFO: task syz-executor204:7962 blocked for more than 140 seconds.
[ 1001.360704]       Not tainted 4.14.253-syzkaller #0
[ 1001.367718] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.375741] syz-executor204 D28376  7962   7959 0x00000004
[ 1001.381372] Call Trace:
[ 1001.384107]  __schedule+0x88b/0x1de0
[ 1001.388002]  ? lock_acquire+0x170/0x3f0
[ 1001.391955]  ? io_schedule_timeout+0x140/0x140
[ 1001.396637]  ? _raw_spin_unlock+0x29/0x40
[ 1001.400813]  ? fuse_writepage_locked+0xe80/0xe80
[ 1001.405625]  schedule+0x8d/0x1b0
[ 1001.408984]  fuse_wait_on_page_writeback.isra.0+0xdc/0x120
[ 1001.414654]  ? fuse_do_ioctl+0x1570/0x1570
[ 1001.418933]  ? end_page_writeback+0xe3/0x1c0
[ 1001.423421]  ? wait_woken+0x230/0x230
[ 1001.427216]  fuse_launder_page+0xa2/0xd0
[ 1001.431418]  invalidate_inode_pages2_range+0x547/0xc00
[ 1001.436745]  ? clear_shadow_entry+0x160/0x160
[ 1001.441240]  ? fuse_range_is_writeback+0x1f0/0x1f0
[ 1001.446220]  ? fuse_file_alloc+0x1ca/0x260
[ 1001.450448]  ? _raw_spin_unlock+0x29/0x40
[ 1001.455208]  ? fuse_do_open+0x18e/0x460
[ 1001.459173]  fuse_finish_open+0x262/0x500
[ 1001.463521]  fuse_open_common+0x1fc/0x250
[ 1001.467724]  do_dentry_open+0x44b/0xec0
[ 1001.471691]  ? fuse_open_common+0x250/0x250
[ 1001.476058]  ? __inode_permission+0xcd/0x2f0
[ 1001.480460]  vfs_open+0x105/0x220
[ 1001.483992]  path_openat+0x628/0x2970
[ 1001.487803]  ? path_lookupat+0x780/0x780
[ 1001.491855]  ? trace_hardirqs_on+0x10/0x10
[ 1001.496136]  do_filp_open+0x179/0x3c0
[ 1001.499930]  ? may_open_dev+0xe0/0xe0
[ 1001.503783]  ? lock_downgrade+0x740/0x740
[ 1001.507919]  ? do_raw_spin_unlock+0x164/0x220
[ 1001.512392]  ? _raw_spin_unlock+0x29/0x40
[ 1001.516580]  ? __alloc_fd+0x1be/0x490
[ 1001.520375]  do_sys_open+0x296/0x410
[ 1001.524137]  ? filp_open+0x60/0x60
[ 1001.527690]  ? do_syscall_64+0x4c/0x640
[ 1001.531643]  ? compat_SyS_openat+0x30/0x30
[ 1001.536035]  do_syscall_64+0x1d5/0x640
[ 1001.540007]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.545241] RIP: 0033:0x7fc5be92f539
[ 1001.548973] RSP: 002b:00007fc5be8bf2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
[ 1001.556777] RAX: ffffffffffffffda RBX: 00007fc5be9c04d0 RCX: 00007fc5be92f539
[ 1001.564145] RDX: 00007fc5be92f539 RSI: 0000000000000000 RDI: 0000000020000280
[ 1001.571490] RBP: 00007fc5be98d164 R08: 0000000000000000 R09: 0000000000000000
[ 1001.578790] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
[ 1001.586212] R13: 00007fc5be989158 R14: 00007fc5be98b160 R15: 00007fc5be9c04d8
[ 1001.593540] 
[ 1001.593540] Showing all locks held in the system:
[ 1001.599847] 1 lock held by khungtaskd/1517:
[ 1001.604276]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff87016d5c>] debug_show_all_locks+0x7c/0x21a
[ 1001.613433] 2 locks held by syz-executor204/7962:
[ 1001.618262]  #0:  (sb_writers#10){.+.+}, at: [<ffffffff818de3aa>] mnt_want_write+0x3a/0xb0
[ 1001.626828]  #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff822f0237>] fuse_open_common+0x177/0x250
[ 1001.636889] 
[ 1001.638505] =============================================
[ 1001.638505] 
[ 1001.645558] NMI backtrace for cpu 0
[ 1001.649178] CPU: 0 PID: 1517 Comm: khungtaskd Not tainted 4.14.253-syzkaller #0
[ 1001.656602] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.665932] Call Trace:
[ 1001.668523]  dump_stack+0x1b2/0x281
[ 1001.672143]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.676677]  ? irq_force_complete_move+0x350/0x350
[ 1001.681637]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.686917]  watchdog+0x5b9/0xb40
[ 1001.690349]  ? hungtask_pm_notify+0x50/0x50
[ 1001.694675]  kthread+0x30d/0x420
[ 1001.698026]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.702686]  ret_from_fork+0x24/0x30
[ 1001.706508] Sending NMI from CPU 0 to CPUs 1:
[ 1001.711049] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff87236c8e
[ 1001.712030] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.724400] CPU: 0 PID: 1517 Comm: khungtaskd Not tainted 4.14.253-syzkaller #0
[ 1001.731822] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.741152] Call Trace:
[ 1001.743719]  dump_stack+0x1b2/0x281
[ 1001.747323]  panic+0x1f9/0x42d
[ 1001.750497]  ? add_taint.cold+0x16/0x16
[ 1001.754451]  watchdog+0x5ca/0xb40
[ 1001.757880]  ? hungtask_pm_notify+0x50/0x50
[ 1001.762178]  kthread+0x30d/0x420
[ 1001.765526]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.770168]  ret_from_fork+0x24/0x30
[ 1001.774021] Kernel Offset: disabled
[ 1001.777639] Rebooting in 86400 seconds..