Recently got a new laptop with a fresh install of Ubuntu 18.04 and now
updated to kernel 4.19.21-041921-generic.

It still happens even with 16 GB of memory and 4GB more in swap on SSD.
What is more dangerous is now that laptop has hyperthreading it goes
absolutely crazy and heats up insanely. At that point, the system is so
frozen no commands can fix it as one never gets to write them.
Restarting the machine with a button is the only option.

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https://bugs.launchpad.net/bugs/1518457

Title:
  kswapd0 100% CPU usage

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