ARP1_0029445_126 https://www.worldcommunitygrid.org/contribution/workunit/151203465

# OS (64 bit) Status     Sent (UTC)          Due or Return       CPU Hours
0 Win10 Pro  User Abort  2022-02-13 20:37:20 2022-02-19 08:15:12
1 Win10 Pro  Error       2022-02-13 20:38:29 2022-02-13 20:43:54
2 Win11 Pro  Error       2022-02-13 20:44:36 2022-02-13 22:30:03
3 Win11 Pro  Pending Va. 2022-02-13 22:30:13 2022-02-14 13:34:42 15/15.01
4 Win10 Core Error       2022-02-19 08:15:24 2022-02-19 08:19:10 ------- My PC
5 Win10	Core In Progress 2022-02-19 08:19:12 2022-02-22 08:19:12
6 Win10 Pro  In Progress 2022-02-19 15:38:44 2022-02-22 15:38:44

Errors on 1, 2, and 4 are all the same, download MD5 check errors. Task number 4 on this workunit was sent 6 days later to still have this random MD5 check error.

WU download error: couldn't get input files:
<file_xfer_error>
<file_name>c7ef6b3ff39ae6707aa33bbac87415fb.</file_name>
<error_code>-119 (md5 checksum failed for file)</error_code>
<error_message>MD5 check failed</error_message>
</file_xfer_error>

I have seen this happen, about 1% or 2% chance over the past year, mostly ARP1 tasks. This error, i guess, kills reliable host and can possibly stop getting any more tasks for a while, but looks like my computer (Ryzen 3900x) have enough pending validation to soon become reliable again 1 day later.

My guess is, server could possibly have data mismatch error on RAID1 storage or other redundant filesystem, which can cause random 50% chance to download or get corrupt data. Or possibly some other data corruption between server and client such as network routers, ethernet switch, or load balancers. Could also be failing ethernet cables or SATA storage/cables.