Swap file on LUKS partition

[TLATER]

This is definitely not expected behavior. Can you keep dmesg -w running in a terminal (potentially via ssh) to watch for kernel messages before the freeze happens?

Before you do that, though, to prevent potentially destructive mistakes, are you using btrfs? If so, check for data corruption before continuing to use the system, you can’t simply use a raw swap file on btrfs, you need to specially prepare it: Swapfile — BTRFS documentation

I really disrecommend using swapfiles in general, if you need more swap space just resize your partitions:

@TLATER

Really, the more I think about this the more I disrecommend using swap files. They’re anything but noob-friendly, inherently cause reproducibility issues, technically less performant due to the possibility of fragmentation, and an inherent data destruction risk with certain file systems. The only benefit is that they’re easy to resize, but that inherently causes the very fragmentation that makes them imperformant, so you should never actually do that (and nobody tells you this…). Plus, this is not the early 2000s, resizing filesystems is quite possible.