I ran into it the first time in 2005 and it was a widely known issue, easy to find if you could find where your program was pseudo-randomly blocking (pun intend

I ran into it the first time in 2005 and it was a widely known issue, easy to find if you could find where your program was pseudo-randomly blocking (pun intended). FreeBSD already had unified random/urandom by that point. I’m not sure if the Linux folks find something wrong with existing, time tested approaches or if there’s some NIH going on, but it doesn’t seem like a multi-decade problem.