1.9.2/1.9.3 exhibit SEGV with many threads+tcp connections
ruby -v is 1.9.2-p290, but we're seeing this in 1.9.3-p194 as well.
This does not exhibit on OS X, only linux, we tested on Ubuntu 12.04.
I can get more information if desired.
Just guessing, this appears to be a bug in how FD_SETSIZE is handled.