ENOMEM on uv_spawn on Windows with env set

[SinisterRectus]

Code:

local uv = require('uv')

local command = 'cmd.exe'
local options = {
	env = {},
}

local handle, pid = uv.spawn(command, options, function(...)
	print('exit:', ...)
end)

print('spawn:', handle, pid)

Output:

spawn:  nil     ENOMEM: not enough memory

Removing the env field from the options table does not produce the issue. Tested with luv 1.27.0 via luvi 2.9.3 on Windows 10 Home 1903. Cannot reproduce on ubuntu 16.04 using an equivalent command. All 64-bit.

I don't know if this issue is in luv or in libuv or if it's fixed in a newer version. I ran into it while trying to build luvit on Windows and test-process and test-process-exec failed.

[squeek502]

Related: this comment and the comments after it

This test case should help a lot in getting to the bottom of it.

[squeek502]

This is a Libuv bug that was fixed in 1.31.0:

* win: fix uv_spawn() ENOMEM on empty env (Ben Noordhuis)

[SinisterRectus]

Good stuff.