blocked for more than 120 seconds

[sctb512]

I always get the following error, is there any way to fix it？

162 [ 843.072392] INFO: task python3:5604 blocked for more than 120 seconds.
163 [ 843.092463] Tainted: G OE 4.4.0-140-generic #166~14.04.1-Ubuntu
164 [ 843.112863] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
165 [ 843.133422] python3 D ffff880838017788 0 5604 3943 0x00000000
166 [ 843.133427] ffff880838017788 0000000100000000 ffff880857d15400 ffff880838018000
167 [ 843.133429] 0000000000000000 7fffffffffffffff ffff88107fff5908 ffffffff818205c0
168 [ 843.133432] ffff8808380177a0 ffffffff8181fe75 ffff88085ee97300 ffff880838017848
169 [ 843.133434] Call Trace:
170 [ 843.133443] [] ? bit_wait+0x50/0x50
171 [ 843.133446] [] schedule+0x35/0x80
172 [ 843.133449] [] schedule_timeout+0x23b/0x2d0
173 [ 843.133455] [] ? blk_flush_plug_list+0xc4/0x200
174 [ 843.133460] [] ? ktime_get+0x3e/0xb0
175 [ 843.133462] [] ? bit_wait+0x50/0x50
176 [ 843.133464] [] io_schedule_timeout+0xa6/0x110
177 [ 843.133467] [] bit_wait_io+0x1b/0x60
178 [ 843.133469] [] __wait_on_bit+0x62/0x90
179 [ 843.133473] [] ? pageout.isra.43+0x1a5/0x280
180 [ 843.133478] [] wait_on_page_bit+0xc0/0xd0
181 [ 843.133483] [] ? autoremove_wake_function+0x40/0x40
182 [ 843.133486] [] shrink_page_list+0x6d4/0x770
183 [ 843.133489] [] shrink_inactive_list+0x1e9/0x500
184 [ 843.133491] [] shrink_lruvec+0x59e/0x740
185 [ 843.133494] [] shrink_zone+0xdc/0x2c0
186 [ 843.133496] [] do_try_to_free_pages+0x153/0x3e0
187 [ 843.133499] [] ? get_page_from_freelist+0x422/0x920
188 [ 843.133504] [] ? find_next_bit+0x19/0x20
189 [ 843.133506] [] try_to_free_mem_cgroup_pages+0xb7/0x170
190 [ 843.133511] [] try_charge+0x180/0x630
191 [ 843.133514] [] mem_cgroup_try_charge+0x63/0x1b0
192 [ 843.133517] [] handle_mm_fault+0x1295/0x1b60
193 [ 843.133520] [] ? __schedule+0x2a2/0x820
194 [ 843.133522] [] ? __schedule+0x296/0x820
195 [ 843.133524] [] ? __schedule+0x296/0x820
196 [ 843.133529] [] __do_page_fault+0x19e/0x430
197 [ 843.133531] [] do_page_fault+0x22/0x30
198 [ 843.133535] [] page_fault+0x28/0x30