Readynas 104 won't boot. Error 354 out_of_memory. After upgrade to 6.4.1 #26323717

Count me in, I just ran into this as well - Reported in #26383504 . 

The scenario is nearly identical to the author and other users who have reported. 

Although my original ticket was regarding an NFS mount issue, I ran into this as a result of upgrading from 6.2.2 -> 6.4.1 per troubleshooting steps. There was a version I had to step through, I can't recall right now which one exactly and I cannot access any logs at the moment. So far I'm hesistant to try more reboots or boot into other modes until instructed by support.

Upon first boot after the upgrade to 6.4.1, immediately noticed "calculating" on the volume was taking quite some time and never-ending.

The unit ran for approximately 12 hours (give or take) seemingly okay in terms of r/w operations..I may have even rebooted once more in those 12 hours..in any case then the issue began at some point.

When I hard reboot (unplug) after encountering the error/crash, UI doesn't ever seem to fully load but I am able to get an active terminal. free disk was above 60%, and maybe unrelated but saw a spike in kswapd cpu usage just as it crashed. This probably happens all within a minute or two at most before hitting err 354 again. I'm not running anything out of the ordinary (ssh, https, http, rsync, nfs, smb, and No AV or other apps).

I have an abundant number of snapshots that I don't care for. Is my understanding correct that support can delete the snapshots + disable quotas to alleviate this issue? For disabling quotas is that simply a config change or something further..? 

Thanks all!