Comment 14 for bug 1891773

4.15.0-118 still have the issue:

Oct 11 02:20:36 localhost kernel: [1043143.644035] INFO: task kcompactd0:39 blocked for more than 120 seconds.
Oct 11 02:20:36 localhost kernel: [1043143.645095] Not tainted 4.15.0-118-generic #119-Ubuntu
Oct 11 02:20:36 localhost kernel: [1043143.645969] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 11 02:20:36 localhost kernel: [1043143.647159] kcompactd0 D 0 39 2 0x80000000
Oct 11 02:20:36 localhost kernel: [1043143.647161] Call Trace:
Oct 11 02:20:36 localhost kernel: [1043143.647169] __schedule+0x24e/0x880
Oct 11 02:20:36 localhost kernel: [1043143.647172] schedule+0x2c/0x80
Oct 11 02:20:36 localhost kernel: [1043143.647173] io_schedule+0x16/0x40
Oct 11 02:20:36 localhost kernel: [1043143.647176] __lock_page+0xff/0x140
Oct 11 02:20:36 localhost kernel: [1043143.647179] ? page_cache_tree_insert+0xe0/0xe0
Oct 11 02:20:36 localhost kernel: [1043143.647182] migrate_pages+0x91f/0xb80
Oct 11 02:20:36 localhost kernel: [1043143.647184] ? __ClearPageMovable+0x10/0x10
Oct 11 02:20:36 localhost kernel: [1043143.647186] ? isolate_freepages_block+0x3b0/0x3b0
Oct 11 02:20:36 localhost kernel: [1043143.647187] compact_zone+0x681/0x950
Oct 11 02:20:36 localhost kernel: [1043143.647189] kcompactd_do_work+0xfe/0x2a0
Oct 11 02:20:36 localhost kernel: [1043143.647191] ? __switch_to_asm+0x35/0x70
Oct 11 02:20:36 localhost kernel: [1043143.647193] ? __switch_to_asm+0x41/0x70
Oct 11 02:20:36 localhost kernel: [1043143.647195] kcompactd+0x86/0x1c0
Oct 11 02:20:36 localhost kernel: [1043143.647196] ? kcompactd+0x86/0x1c0
Oct 11 02:20:36 localhost kernel: [1043143.647199] ? wait_woken+0x80/0x80
Oct 11 02:20:36 localhost kernel: [1043143.647202] kthread+0x121/0x140
Oct 11 02:20:36 localhost kernel: [1043143.647203] ? kcompactd_do_work+0x2a0/0x2a0
Oct 11 02:20:36 localhost kernel: [1043143.647204] ? kthread_create_worker_on_cpu+0x70/0x70
Oct 11 02:20:36 localhost kernel: [1043143.647206] ret_from_fork+0x35/0x40