Seems to me aioEnable somehow triggers this. It maintains buffers of size FD_SETSIZE (1024 on Linux)*, so an fd parameter** >= that, could probably trigger such an error. Maybe you could put a halt in whichever method in OSSubprocess/OSProcess calls the primitive triggered when condition occurs, to see if that is the cause? If so, identifying *why* you end up with fd's that high (which, afaik, isn't normal), will probably lead to a workaround/solution...
Cheers, Henry * https://github.com/pharo-project/pharo-vm/blob/e0ce2d9d78c3c7b37bbc12cd8730c6a15f1f057c/opensmalltalk-vm/platforms/unix/vm/aio.c ** https://github.com/pharo-project/pharo-vm/blob/c50dec02d2875de56c84d11889c78484e2d5cda8/mc/VMConstruction-Plugins-AioPlugin.package/UnixAioPlugin.class/instance/primitiveAioEnable.st -- Sent from: http://forum.world.st/Pharo-Smalltalk-Developers-f1294837.html
