12" Macbook kernel panics

The SSD is failing on that laptop as noted by the "nvme" (aka type of SSD) reference showing the "PCI link is down" meaning no communication with the SSD.. Unfortunately according to EveryMac.com, the 12" 2015-2017 models have the SSD integrated onto the Logic Board which means the entire Logic Board must be replaced to fix the problem which is very expensive. The M2 & M3 laptops will perform so much better than these older 12" models.

I hope you have a good backup since that SSD could fail completely at any time....you've already been give a warning by these Kernel Panics.

I would recommend putting any money for repairs towards a new laptop. Even a 2017 model is now old and will be considered "Vintage" later this year most likely. macOS 13.x Ventura is the last OS for a 2017 laptop so it will stop receiving updates by the end of 2025. If you have the 2015 or 2016 model, then they are even closer to the chopping block.

Just make sure to check that the used Logic Board does not have a firmware password lock enabled and is not still being managed by a previous owner....the latter is harder to identify and may not be noticed for days or even weeks depending how the previous owner would have managed the laptop. For the former, just Option Boot the laptop to see if you get a padlock on the screen. For the latter, look out for any messages or notifications about management....sometimes it will be obvious such as needing to enroll the computer during setup, while other times it will just be a macOS notification from time to time. You cannot do anything about either one so return it for a full refund if you encounter either condition.

Keep in mind the system serial number follows the Logic Board since it is embedded within the firmware.

Good luck.