On Jun 11, 2015, at 2:06 PM, Frank Morauf <fr...@morauf.de> wrote:
> 
> Running the following lines let windows physical memory grow until no
> more left (task-manager: physical memory).

I’ve run it here in two separate sessions of about 10 minutes each.  Memory 
usage isn’t growing.  Windows 10 preview, 64-bit OS and 64-bit Cygwin.

> The taken memory is never
> freed until os restart.

I don’t think Cygwin could do that even if it wanted to, given that you don’t 
have any Cygwin services running.  Once the last Cygwin process dies, the OS 
*will* release the memory it was holding.

cygcheck didn’t seem to find any BLODA on your system, but that seems a more 
likely explanation than that Cygwin — a purely user-space program — has somehow 
caused a kernel-level memory leak.

> Tested on three different Windows 7 x64 machines with actual
> cygwin 2.x (32 and 64 bit).

Try testing with all antimalware software disabled, or better, uninstalled.
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