windows libuv freeze when running tests #16556
Description
As seen every time appveyor times out lately. I get this locally once in a while, so it's probably not specific to the appveyor environment, but I've rarely if ever seen it happen on 32 bit appveyor.
I did attach gdb to this once and it looked like Julia was waiting in uv_poll, so this may be correlated with the libuv upgrade making this more frequent recently. I'll try to catch it again but could use debugging suggestions for how to start tracking down the underlying cause.