[  OK  ] Started OpenBSD Secure Shell server.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.81' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 1001.329386] INFO: task syz-executor213:8000 blocked for more than 140 seconds.
[ 1001.336807]       Not tainted 4.14.298-syzkaller #0
[ 1001.342769] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.350894] syz-executor213 D28008  8000   7998 0x00000004
[ 1001.356511] Call Trace:
[ 1001.359082]  __schedule+0x88b/0x1de0
[ 1001.362833]  ? lock_acquire+0x170/0x3f0
[ 1001.366805]  ? io_schedule_timeout+0x140/0x140
[ 1001.371417]  ? _raw_spin_unlock+0x29/0x40
[ 1001.375555]  ? fuse_writepage_locked+0xe80/0xe80
[ 1001.380335]  schedule+0x8d/0x1b0
[ 1001.383695]  fuse_wait_on_page_writeback.isra.0+0xdc/0x120
[ 1001.389358]  ? fuse_do_ioctl+0x1570/0x1570
[ 1001.393576]  ? end_page_writeback+0xe3/0x1c0
[ 1001.397960]  ? wait_woken+0x230/0x230
[ 1001.402304]  fuse_launder_page+0xa2/0xd0
[ 1001.406363]  invalidate_inode_pages2_range+0x547/0xc00
[ 1001.411671]  ? clear_shadow_entry+0x160/0x160
[ 1001.416158]  ? fuse_range_is_writeback+0x1f0/0x1f0
[ 1001.421112]  ? fuse_file_alloc+0x1ca/0x260
[ 1001.425340]  ? _raw_spin_unlock+0x29/0x40
[ 1001.429568]  ? fuse_do_open+0x18e/0x460
[ 1001.433531]  fuse_finish_open+0x262/0x500
[ 1001.437665]  fuse_open_common+0x234/0x290
[ 1001.441925]  do_dentry_open+0x44b/0xec0
[ 1001.445887]  ? fuse_open_common+0x290/0x290
[ 1001.450242]  ? __inode_permission+0xcd/0x2f0
[ 1001.454632]  vfs_open+0x105/0x220
[ 1001.458062]  path_openat+0x628/0x2970
[ 1001.461894]  ? path_lookupat+0x780/0x780
[ 1001.465943]  ? trace_hardirqs_on+0x10/0x10
[ 1001.470216]  do_filp_open+0x179/0x3c0
[ 1001.474001]  ? may_open_dev+0xe0/0xe0
[ 1001.477779]  ? lock_downgrade+0x740/0x740
[ 1001.481947]  ? do_raw_spin_unlock+0x164/0x220
[ 1001.486430]  ? _raw_spin_unlock+0x29/0x40
[ 1001.490607]  ? __alloc_fd+0x1be/0x490
[ 1001.494395]  do_sys_open+0x296/0x410
[ 1001.498085]  ? filp_open+0x60/0x60
[ 1001.501649]  ? do_syscall_64+0x4c/0x640
[ 1001.505610]  ? compat_SyS_openat+0x30/0x30
[ 1001.509875]  do_syscall_64+0x1d5/0x640
[ 1001.513754]  entry_SYSCALL_64_after_hwframe+0x5e/0xd3
[ 1001.518939] 
[ 1001.518939] Showing all locks held in the system:
[ 1001.525292] 1 lock held by khungtaskd/1532:
[ 1001.529765]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff8702a559>] debug_show_all_locks+0x7c/0x21a
[ 1001.538800] 1 lock held by in:imklog/7630:
[ 1001.543049]  #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff818d8b5b>] __fdget_pos+0x1fb/0x2b0
[ 1001.551534] 2 locks held by syz-executor213/8000:
[ 1001.556358]  #0:  (sb_writers#10){.+.+}, at: [<ffffffff818e1bca>] mnt_want_write+0x3a/0xb0
[ 1001.564787]  #1:  (&sb->s_type->i_mutex_key#17){+.+.}, at: [<ffffffff822f7664>] fuse_open_common+0x1a4/0x290
[ 1001.574829] 
[ 1001.576438] =============================================
[ 1001.576438] 
[ 1001.583964] NMI backtrace for cpu 0
[ 1001.587586] CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.298-syzkaller #0
[ 1001.595008] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
[ 1001.604338] Call Trace:
[ 1001.606901]  dump_stack+0x1b2/0x281
[ 1001.610503]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.614970]  ? irq_force_complete_move+0x350/0x350
[ 1001.619875]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.625126]  watchdog+0x5b9/0xb40
[ 1001.628555]  ? hungtask_pm_notify+0x50/0x50
[ 1001.632849]  kthread+0x30d/0x420
[ 1001.636186]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.640843]  ret_from_fork+0x24/0x30
[ 1001.644607] Sending NMI from CPU 0 to CPUs 1:
[ 1001.649138] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8724adce
[ 1001.650102] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.662465] CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.298-syzkaller #0
[ 1001.669895] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
[ 1001.679222] Call Trace:
[ 1001.681794]  dump_stack+0x1b2/0x281
[ 1001.685397]  panic+0x1f9/0x42d
[ 1001.688563]  ? add_taint.cold+0x16/0x16
[ 1001.692514]  watchdog+0x5ca/0xb40
[ 1001.695941]  ? hungtask_pm_notify+0x50/0x50
[ 1001.700233]  kthread+0x30d/0x420
[ 1001.703571]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.708225]  ret_from_fork+0x24/0x30
[ 1001.712169] Kernel Offset: disabled
[ 1001.715781] Rebooting in 86400 seconds..