Warning: Permanently added '10.128.1.71' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 1001.340646] INFO: task syz-executor130:7971 blocked for more than 140 seconds.
[ 1001.348086]       Not tainted 4.14.272-syzkaller #0
[ 1001.354117] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.362109] syz-executor130 D28368  7971   7969 0x00000004
[ 1001.367717] Call Trace:
[ 1001.370289]  __schedule+0x88b/0x1de0
[ 1001.374041]  ? lock_acquire+0x170/0x3f0
[ 1001.378015]  ? io_schedule_timeout+0x140/0x140
[ 1001.382620]  ? _raw_spin_unlock+0x29/0x40
[ 1001.386760]  ? fuse_writepage_locked+0xe80/0xe80
[ 1001.391692]  schedule+0x8d/0x1b0
[ 1001.395091]  fuse_wait_on_page_writeback.isra.0+0xdc/0x120
[ 1001.400891]  ? fuse_do_ioctl+0x1570/0x1570
[ 1001.405126]  ? end_page_writeback+0xe3/0x1c0
[ 1001.409511]  ? wait_woken+0x230/0x230
[ 1001.413359]  fuse_launder_page+0xa2/0xd0
[ 1001.417417]  invalidate_inode_pages2_range+0x547/0xc00
[ 1001.422729]  ? clear_shadow_entry+0x160/0x160
[ 1001.427217]  ? fuse_range_is_writeback+0x1f0/0x1f0
[ 1001.432184]  ? fuse_file_alloc+0x1ca/0x260
[ 1001.436416]  ? _raw_spin_unlock+0x29/0x40
[ 1001.440603]  ? fuse_do_open+0x18e/0x460
[ 1001.444565]  fuse_finish_open+0x262/0x500
[ 1001.448712]  fuse_open_common+0x234/0x290
[ 1001.452892]  do_dentry_open+0x44b/0xec0
[ 1001.456996]  ? fuse_open_common+0x290/0x290
[ 1001.461346]  ? __inode_permission+0xcd/0x2f0
[ 1001.465746]  vfs_open+0x105/0x220
[ 1001.469179]  path_openat+0x628/0x2970
[ 1001.473026]  ? path_lookupat+0x780/0x780
[ 1001.477079]  ? trace_hardirqs_on+0x10/0x10
[ 1001.481345]  do_filp_open+0x179/0x3c0
[ 1001.485134]  ? may_open_dev+0xe0/0xe0
[ 1001.488918]  ? lock_downgrade+0x740/0x740
[ 1001.493100]  ? do_raw_spin_unlock+0x164/0x220
[ 1001.497622]  ? _raw_spin_unlock+0x29/0x40
[ 1001.501800]  ? __alloc_fd+0x1be/0x490
[ 1001.505593]  do_sys_open+0x296/0x410
[ 1001.509283]  ? filp_open+0x60/0x60
[ 1001.512858]  ? do_syscall_64+0x4c/0x640
[ 1001.516820]  ? compat_SyS_openat+0x30/0x30
[ 1001.521077]  do_syscall_64+0x1d5/0x640
[ 1001.524957]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.530123] RIP: 0033:0x7f50ee0cd4c9
[ 1001.533865] RSP: 002b:00007f50ee07e2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
[ 1001.541606] RAX: ffffffffffffffda RBX: 00007f50ee15e4c0 RCX: 00007f50ee0cd4c9
[ 1001.548859] RDX: 00007f50ee0cd4c9 RSI: 0000000000000000 RDI: 00000000200001c0
[ 1001.556162] RBP: 00007f50ee12b164 R08: 0000000000000000 R09: 0000000000000000
[ 1001.563461] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
[ 1001.570765] R13: 00007f50ee127158 R14: 00007f50ee129160 R15: 00007f50ee15e4c8
[ 1001.578134] 
[ 1001.578134] Showing all locks held in the system:
[ 1001.584494] 1 lock held by khungtaskd/1533:
[ 1001.588885]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff8702281c>] debug_show_all_locks+0x7c/0x21a
[ 1001.597979] 2 locks held by syz-executor130/7971:
[ 1001.602866]  #0:  (sb_writers#10){.+.+}, at: [<ffffffff818df1da>] mnt_want_write+0x3a/0xb0
[ 1001.611321]  #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff822f1de4>] fuse_open_common+0x1a4/0x290
[ 1001.621334] 
[ 1001.622947] =============================================
[ 1001.622947] 
[ 1001.630027] NMI backtrace for cpu 1
[ 1001.633710] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.272-syzkaller #0
[ 1001.641141] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.650478] Call Trace:
[ 1001.653049]  dump_stack+0x1b2/0x281
[ 1001.656654]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.661125]  ? irq_force_complete_move+0x350/0x350
[ 1001.666033]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.671284]  watchdog+0x5b9/0xb40
[ 1001.674714]  ? hungtask_pm_notify+0x50/0x50
[ 1001.679014]  kthread+0x30d/0x420
[ 1001.682358]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.687003]  ret_from_fork+0x24/0x30
[ 1001.690761] Sending NMI from CPU 1 to CPUs 0:
[ 1001.695314] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff87242a2e
[ 1001.696259] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.708640] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.272-syzkaller #0
[ 1001.716062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.725393] Call Trace:
[ 1001.727966]  dump_stack+0x1b2/0x281
[ 1001.731590]  panic+0x1f9/0x42d
[ 1001.734759]  ? add_taint.cold+0x16/0x16
[ 1001.738716]  watchdog+0x5ca/0xb40
[ 1001.742147]  ? hungtask_pm_notify+0x50/0x50
[ 1001.746451]  kthread+0x30d/0x420
[ 1001.749812]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.754466]  ret_from_fork+0x24/0x30
[ 1001.758431] Kernel Offset: disabled
[ 1001.762060] Rebooting in 86400 seconds..