[  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 '10.128.0.15' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [  764.008892] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
[ 1001.336234] INFO: task syz-executor617:7992 blocked for more than 140 seconds.
[ 1001.343845]       Not tainted 4.14.234-syzkaller #0
[ 1001.349879] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.358066] syz-executor617 D27272  7992   7991 0x00000004
[ 1001.363687] Call Trace:
[ 1001.366452]  __schedule+0x88b/0x1de0
[ 1001.370269]  ? mark_held_locks+0xa6/0xf0
[ 1001.374310]  ? io_schedule_timeout+0x140/0x140
[ 1001.378932]  schedule+0x8d/0x1b0
[ 1001.382293]  io_schedule+0xb5/0x120
[ 1001.385921]  bit_wait_io+0x12/0x90
[ 1001.389501]  __wait_on_bit_lock+0xc2/0x1d0
[ 1001.393729]  ? bit_wait+0x90/0x90
[ 1001.397226]  ? mark_buffer_dirty_inode+0x2ce/0x3a0
[ 1001.402147]  out_of_line_wait_on_bit_lock+0xbc/0xd0
[ 1001.407196]  ? __wait_on_bit_lock+0x1d0/0x1d0
[ 1001.411685]  ? bit_waitqueue+0x30/0x30
[ 1001.415554]  __lock_buffer+0x43/0x50
[ 1001.419309]  __sync_dirty_buffer+0x214/0x290
[ 1001.423738]  __ext4_handle_dirty_metadata+0x169/0x480
[ 1001.429041]  ext4_convert_inline_data_nolock+0x4ce/0xb40
[ 1001.434486]  ? ext4_read_inline_page+0x560/0x560
[ 1001.439283]  ext4_convert_inline_data+0x2ae/0x300
[ 1001.444117]  ? ext4_inline_data_truncate+0x940/0x940
[ 1001.449244]  ext4_punch_hole+0x17a/0x1000
[ 1001.453385]  ext4_fallocate+0x327/0x1d80
[ 1001.457483]  ? rcu_lockdep_current_cpu_online+0xed/0x140
[ 1001.462977]  ? ext4_insert_range+0x1340/0x1340
[ 1001.467592]  vfs_fallocate+0x346/0x790
[ 1001.471468]  SyS_fallocate+0x4a/0x80
[ 1001.475178]  ? compat_SyS_ftruncate+0x20/0x20
[ 1001.479704]  do_syscall_64+0x1d5/0x640
[ 1001.483623]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 1001.488826] RIP: 0033:0x4448e9
[ 1001.492016] RSP: 002b:00007ffc3ddbd098 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
[ 1001.499765] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004448e9
[ 1001.507081] RDX: 0000000000000000 RSI: 0000000100000003 RDI: 0000000000000003
[ 1001.514358] RBP: 0000000000000000 R08: 00000000004b0080 R09: 00000000004b0080
[ 1001.522140] R10: 00000000008001a0 R11: 0000000000000246 R12: 00007ffc3ddbd0c0
[ 1001.529448] R13: 0000000000000000 R14: 431bde82d7b634db R15: 00000000004004a0
[ 1001.536783] 
[ 1001.536783] Showing all locks held in the system:
[ 1001.543096] 1 lock held by khungtaskd/1533:
[ 1001.547494]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff8700af07>] debug_show_all_locks+0x7c/0x21a
[ 1001.556600] 1 lock held by in:imklog/7710:
[ 1001.560813]  #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff818d416b>] __fdget_pos+0x1fb/0x2b0
[ 1001.569272] 3 locks held by syz-executor617/7992:
[ 1001.574099]  #0:  (sb_writers#3){.+.+}, at: [<ffffffff81860921>] vfs_fallocate+0x5c1/0x790
[ 1001.582569]  #1:  (&ei->i_mmap_sem){++++}, at: [<ffffffff81bb21d2>] ext4_punch_hole+0x172/0x1000
[ 1001.591648]  #2:  (&ei->xattr_sem){++++}, at: [<ffffffff81b974ad>] ext4_convert_inline_data+0x19d/0x300
[ 1001.601286] 
[ 1001.602977] =============================================
[ 1001.602977] 
[ 1001.610323] NMI backtrace for cpu 1
[ 1001.613944] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.234-syzkaller #0
[ 1001.621388] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.630720] Call Trace:
[ 1001.633303]  dump_stack+0x1b2/0x281
[ 1001.636909]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.641379]  ? irq_force_complete_move+0x350/0x350
[ 1001.646371]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.651622]  watchdog+0x5b9/0xb40
[ 1001.655051]  ? hungtask_pm_notify+0x50/0x50
[ 1001.659540]  kthread+0x30d/0x420
[ 1001.662881]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.667529]  ret_from_fork+0x24/0x30
[ 1001.671309] Sending NMI from CPU 1 to CPUs 0:
[ 1001.675851] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8722ab9e
[ 1001.676806] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.689303] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.234-syzkaller #0
[ 1001.696731] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.706075] Call Trace:
[ 1001.708652]  dump_stack+0x1b2/0x281
[ 1001.712258]  panic+0x1f9/0x42d
[ 1001.715530]  ? add_taint.cold+0x16/0x16
[ 1001.720373]  watchdog+0x5ca/0xb40
[ 1001.724008]  ? hungtask_pm_notify+0x50/0x50
[ 1001.728409]  kthread+0x30d/0x420
[ 1001.732085]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.736752]  ret_from_fork+0x24/0x30
[ 1001.741603] Kernel Offset: disabled
[ 1001.745321] Rebooting in 86400 seconds..