Entry point not found issues with cygwin DLLs

Ken Brown kbrown@cornell.edu
Mon Jul 2 19:35:00 GMT 2018

On 7/2/2018 3:08 PM, Heavenly Avenger wrote:
> I'm having hard times with cygwin here, random libraries stop working 
> once I update or install new ones.

This can happen if you update a package without updating its 
dependencies.  For example, the dependency might have introduced a new API.

> If I run ssh with 'strace' ('strace ssh'), it pops up a windows dialog 
> saying:
> 'the procedure entry point __memcpy_chk could not be located

It is in cygwin1.dll as of cygwin-2.10; see 

> cygwin's dll is: cygwin1.dll file version: 2008.0.0.0, version: 2.8.0.

You need to update the cygwin package.  For best results, you should 
update all of your installed packages to their current versions.  (If 
you're running setup with the --packages option to update or install 
certain packages, then it's a good idea to also use the --upgrade-also 


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