This is what happens when you knit socks out of 100% merino wool sock yarn. This happened after only two seasons in rotation in my sock drawer. This is why I will never knit socks out of yarn without a nylon content, ever again.
Shall I name names? This is a sock knit out of Claudia Hand Painted. I have also, in the last year, had to throw away socks knit out of Blue Moon Fiber Arts lightweight and Knitpicks Sock Garden. These are all lovely yarns with exceptional dye jobs. I own many skeins of all of them. I may buy more in the future. But I will never, never, never knit another pair of socks from them.
I have never worn a hole in a sock with nylon content, and some of those I’ve been wearing for five winters now.
Choose your yarns wisely, everybody. I’d also advise against any alpaca content in any garment that will receive any wear friction or need to be washed, ever.