Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts.
executing program
[  758.814256] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue
[ 1001.331669] INFO: task syz-executor981:7994 blocked for more than 140 seconds.
[ 1001.339084]       Not tainted 4.14.285-syzkaller #0
[ 1001.344723] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1001.352736] syz-executor981 D26496  7994   7993 0x00000004
[ 1001.358345] Call Trace:
[ 1001.360916]  __schedule+0x88b/0x1de0
[ 1001.364662]  ? mark_held_locks+0xa6/0xf0
[ 1001.368725]  ? io_schedule_timeout+0x140/0x140
[ 1001.373369]  schedule+0x8d/0x1b0
[ 1001.376724]  io_schedule+0xb5/0x120
[ 1001.380329]  bit_wait_io+0x12/0x90
[ 1001.383897]  __wait_on_bit_lock+0xc2/0x1d0
[ 1001.388246]  ? bit_wait+0x90/0x90
[ 1001.391737]  ? mark_buffer_dirty_inode+0x2ce/0x3a0
[ 1001.396670]  out_of_line_wait_on_bit_lock+0xbc/0xd0
[ 1001.401719]  ? __wait_on_bit_lock+0x1d0/0x1d0
[ 1001.406206]  ? bit_waitqueue+0x30/0x30
[ 1001.410071]  __lock_buffer+0x43/0x50
[ 1001.413961]  __sync_dirty_buffer+0x214/0x290
[ 1001.418357]  __ext4_handle_dirty_metadata+0x169/0x480
[ 1001.423578]  ext4_convert_inline_data_nolock+0x4e1/0xbd0
[ 1001.429027]  ? ext4_read_inline_page+0x560/0x560
[ 1001.433833]  ext4_convert_inline_data+0x25f/0x400
[ 1001.438666]  ? ext4_inline_data_truncate+0x940/0x940
[ 1001.443794]  ? ext4_page_mkwrite+0x1d0/0xf70
[ 1001.448194]  ext4_page_mkwrite+0x1d8/0xf70
[ 1001.452471]  ? ext4_change_inode_journal_flag+0x3a0/0x3a0
[ 1001.457992]  ? _vm_normal_page+0x162/0x3b0
[ 1001.462253]  ? lock_downgrade+0x740/0x740
[ 1001.466391]  do_page_mkwrite+0xd4/0x2e0
[ 1001.470344]  do_wp_page+0x7e2/0x1db0
[ 1001.474107]  ? __handle_mm_fault+0x129c/0x4620
[ 1001.478676]  ? finish_mkwrite_fault+0x5e0/0x5e0
[ 1001.483372]  ? populate_vma_page_range+0x17b/0x210
[ 1001.488290]  __handle_mm_fault+0x234f/0x4620
[ 1001.492741]  ? vm_insert_page+0x7c0/0x7c0
[ 1001.496882]  ? mark_held_locks+0xa6/0xf0
[ 1001.500925]  handle_mm_fault+0x455/0x9c0
[ 1001.505123]  __do_page_fault+0x549/0xad0
[ 1001.509176]  ? spurious_fault+0x640/0x640
[ 1001.513368]  ? do_page_fault+0x60/0x500
[ 1001.517332]  ? page_fault+0x2f/0x50
[ 1001.520937]  page_fault+0x45/0x50
[ 1001.524416] RIP: 0000:0x431bde82d7b634db
[ 1001.528465] RSP: 69662f2e:0000000000000000 EFLAGS: 7ffcd67c6160
[ 1001.528498] 
[ 1001.528498] Showing all locks held in the system:
[ 1001.540917] 1 lock held by khungtaskd/1533:
[ 1001.545331]  #0:  (tasklist_lock){.+.+}, at: [<ffffffff8701daf9>] debug_show_all_locks+0x7c/0x21a
[ 1001.554444] 1 lock held by in:imklog/7596:
[ 1001.558658]  #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff818d752b>] __fdget_pos+0x1fb/0x2b0
[ 1001.567117] 4 locks held by syz-executor981/7994:
[ 1001.572018]  #0:  (&mm->mmap_sem){++++}, at: [<ffffffff812413a9>] __do_page_fault+0x2b9/0xad0
[ 1001.580816]  #1:  (sb_pagefaults){.+.+}, at: [<ffffffff81bc2988>] ext4_page_mkwrite+0x198/0xf70
[ 1001.589770]  #2:  (&ei->i_mmap_sem){++++}, at: [<ffffffff81bc29c0>] ext4_page_mkwrite+0x1d0/0xf70
[ 1001.598883]  #3:  (&ei->xattr_sem){++++}, at: [<ffffffff81b9b274>] ext4_convert_inline_data+0x1b4/0x400
[ 1001.608474] 
[ 1001.610092] =============================================
[ 1001.610092] 
[ 1001.617280] NMI backtrace for cpu 1
[ 1001.620897] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.285-syzkaller #0
[ 1001.628320] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.637652] Call Trace:
[ 1001.640220]  dump_stack+0x1b2/0x281
[ 1001.643860]  nmi_cpu_backtrace.cold+0x57/0x93
[ 1001.648336]  ? irq_force_complete_move+0x350/0x350
[ 1001.653340]  nmi_trigger_cpumask_backtrace+0x13a/0x180
[ 1001.658610]  watchdog+0x5b9/0xb40
[ 1001.662044]  ? hungtask_pm_notify+0x50/0x50
[ 1001.666343]  kthread+0x30d/0x420
[ 1001.669686]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.674348]  ret_from_fork+0x24/0x30
[ 1001.678147] Sending NMI from CPU 1 to CPUs 0:
[ 1001.682723] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff8723e1ee
[ 1001.683701] Kernel panic - not syncing: hung_task: blocked tasks
[ 1001.696049] CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.285-syzkaller #0
[ 1001.703479] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1001.712810] Call Trace:
[ 1001.715376]  dump_stack+0x1b2/0x281
[ 1001.718980]  panic+0x1f9/0x42d
[ 1001.722148]  ? add_taint.cold+0x16/0x16
[ 1001.726103]  watchdog+0x5ca/0xb40
[ 1001.729532]  ? hungtask_pm_notify+0x50/0x50
[ 1001.733832]  kthread+0x30d/0x420
[ 1001.737173]  ? kthread_create_on_node+0xd0/0xd0
[ 1001.741816]  ret_from_fork+0x24/0x30
[ 1001.745784] Kernel Offset: disabled
[ 1001.749398] Rebooting in 86400 seconds..