Fresh OS, fresh cygwin install, unable to resolve "couldn't allocate heap, Win32 error 487" error

Bill Bierman
Wed Mar 6 08:33:00 GMT 2019

I'm sorry I forgot to attach the cygcheck output file.

On Tue, Mar 5, 2019 at 10:17 PM Bill Bierman <> wrote:
> Hello.  I have a VirtualBox VM running Windows 10 Pro x64 with all current updates at the time of writing this email.  There are no third-party anti-viruses installed.  For that matter, the only thing I have installed apart from cygwin is Visual Studio 2017, Google Chrome, Notepad++ and  7-zip. I have installed 32-bit cygwin (and yes I need to use the 32 bit version).
> I am currently receiving this error when attempting to compile libgmp:
>  *** fatal error in forked process - couldn't allocate heap, Win32 error 487, base 0x28B0000, top 0x2930000, reserve_size 520192, allocsize 524288, page_const 4096
> I have been researching this all day and have gotten to a point where I am no longer finding new things to try on Google, and have grown somewhat desperate.
> Things I have tried:
> 1. /usr/bin/rebase-trigger full
> 2. listdlls and ash /usr/bin/rebaseall -b
> 3. Checking the BLODA, found nothing
> 4. Reinstalling cygwin
> 5. Rebooting the system
> I have used this same setup before many times and have never seen this problem before.
> I am writing to request advice on what to try next, or some way to narrow down why this is happening.  If volunteering to be a guinea pig of some kind could help to fix this issue permanently, I so volunteer.
> Thank you!
> Bill Bierman
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