I'm having the same issue with my System76 Serval as well.
ATA device, with non-removable media
Model Number: Hitachi HTS542525K9SA00
Serial Number: <deleted>
Firmware Revision: BBFOC31P
Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions,
SATA Rev 2.5; Revision: ATA8-AST T13 Project D1697 Revision 0b
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spurious completions during NCQ Hitachi HTS722016K9A300
https://bugs.launchpad.net/bugs/137470
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