pfSense

I was seeing that when I had the RAM disk size set larger than the free memory (but smaller than RAM+SWAP) but not when there was enough free RAM to hold the disks.

See #13508 for some more info there on why it's tricky to solve that case.

It's possible my last change there introduced a new bug, but it was working on my test system before I committed it.

This was indeed broken by my last change on #13508 somehow. Since that fix was only partial anyhow, reverting that is the best way to fix this since the old code was working and a better fix is going to be more risky at this stage.

Same here. On a system where I hit that error on the previous builds, a current build works without error. RAM disks are mounted and working.