Plotter crashed overnight, don't understand exception in debug log

Woke up to the gui having closed down on my machine, and this exception in debug.log:

2021-04-30T03:32:57.727 full_node full_node_server        : WARNING  Peer surpassed rate limit 127.0.0.1, message: request_block_header, port 35792 but not disconnecting
2021-04-30T03:32:57.728 wallet wallet_server              : WARNING  Peer surpassed rate limit 127.0.0.1, message: respond_block_header, port 8444 but not disconnecting
2021-04-30T03:32:57.729 full_node full_node_server        : WARNING  Peer surpassed rate limit 127.0.0.1, message: request_block_header, port 35792 but not disconnecting
2021-04-30T03:32:57.730 wallet wallet_server              : WARNING  Peer surpassed rate limit 127.0.0.1, message: respond_block_header, port 8444 but not disconnecting
2021-04-30T03:32:57.732 full_node full_node_server        : WARNING  Peer surpassed rate limit 127.0.0.1, message: request_block_header, port 35792 but not disconnecting
2021-04-30T03:32:57.732 wallet wallet_server              : WARNING  Peer surpassed rate limit 127.0.0.1, message: respond_block_header, port 8444 but not disconnecting
2021-04-30T04:10:17.186 daemon __main__                   : ERROR    Unexpected exception trying to send to websocket: code = 1006 (connection closed abnormally [internal]), no reason Traceback (most recent call last):
  File "/home/rick/chia-blockchain/venv/lib/python3.8/site-packages/websockets/protocol.py", line 838, in transfer_data
    await asyncio.shield(self._put_message_waiter)
asyncio.exceptions.CancelledError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "../chia/daemon/server.py", line 182, in safe_handle
    await socket.send(response)
  File "/home/rick/chia-blockchain/venv/lib/python3.8/site-packages/websockets/protocol.py", line 555, in send
    await self.ensure_open()
  File "/home/rick/chia-blockchain/venv/lib/python3.8/site-packages/websockets/protocol.py", line 812, in ensure_open
    raise self.connection_closed_exc()
websockets.exceptions.ConnectionClosedError: code = 1006 (connection closed abnormally [internal]), no reason

2021-04-30T04:23:47.473 daemon __main__                   : ERROR    Unexpected exception trying to send to websocket: code = 1006 (connection closed abnormally [internal]), no reason Traceback (most recent call last):
  File "/home/rick/chia-blockchain/venv/lib/python3.8/site-packages/websockets/protocol.py", line 838, in transfer_data
    await asyncio.shield(self._put_message_waiter)
asyncio.exceptions.CancelledError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "../chia/daemon/server.py", line 182, in safe_handle
    await socket.send(response)
  File "/home/rick/chia-blockchain/venv/lib/python3.8/site-packages/websockets/protocol.py", line 555, in send
    await self.ensure_open()
  File "/home/rick/chia-blockchain/venv/lib/python3.8/site-packages/websockets/protocol.py", line 812, in ensure_open
    raise self.connection_closed_exc()
websockets.exceptions.ConnectionClosedError: code = 1006 (connection closed abnormally [internal]), no reason

And there is this weird line at the end of the most recent plotter log:

Bucket 127 uniform sort. Ram: 4.328GiB, u_sort min: 0.563GiB, qs min: 0.281GiB.
Total matches: 4295067512
Forward propagation table time: 780.990 seconds. CPU (201.460%) Fri Apr 30 05:19:49 2021
Computing table 3
Bucket 0 uniform sort. Ram: 4.328GiB, u_sort min: 2.250GiB, qs min: 0.563GiB.
Bucket 1 uniform sort. Ram: 4.328GiB, u_sort min: 1.125GiB, qs min: 0.562GiB.
Bucket 2 uniform sort. Ram: 4.328GiB, u_sort min: 1.125GiB, qs min: 0.562GiB.
Bucket 3 uniform sort. Ram: 4.328GiB, u_sort min: 2.250GiB, qs min: 0.563GiB.
Bucket 4 uniform sort. Ram: 4.328GiB, u_sort min: 2.250GiB, qs min: 0.563GiB.
Bucket 5 uniform sort. Ram: 4.328GiB, u_sort min: 2.250GiB, qs min: 0.563GiB.
Bucket 6 uniform sort. Ram: 4.328GiB, u_sort min: 1.125GiB, qs min: 0.562GiB.
Bucket 7 uniform sort. Ram: 4.328GiB, u_sort min: 1.125GiB, qs min: 0.562GiB.
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@

I was plotting 12 k32 plots in parallel, 4 threads and 4500MiB, 30min stagger.

OS : Ubuntu Budgie 20.04, packages up to date
CPU : AMD Ryzen 9 5950X
RAM : 2x 32GB Corsair Vengeance LPX DDR4-3600 CL18-22-22-42
MBD : Asus Prime B550-Plus
SSD : 2x 2TB Corsair MP600
HDD : 12TB WD My Book over USB
PSU : Corsair HX750
GPU : Nvidia GeForce GT240

same here in windows. Tried reload and force reload but nothing.
If I kill everything I will kill plotting jobs :frowning:

same problem for me…did you get any solution please let me know i also have same configuration

Not sure if this was related, but I experienced daily crashing due to a faulty md driver in ubuntu server’s kernel soon after this issue. If you’re running your SSDs in RAID0, either try running them separately or use something other than XFS as a filesystem and see if that helps.