cygwin stopped working

[Andreas Schiffler <aschiffler@ferzkopp.net>]

Terminal (bash) fails with:

Error: Could not fork child process: Resource temporarily unavailable (-1).
DLL rebasing may be required; see 'rebaseall / rebase --help'.

PC was rebooted and the cygwin was "refreshed".

Installer (version 2.884, 32bit) fails with:

Package: 0/Perpetual
     0p_000_autorebase.dash exit code 127
     0p_update-info-dir.dash exit code 127
Package: _/base-cygwin
     000-cygwin-post-install.sh exit code 254
Package: _/coreutils
     coreutils.sh exit code 254
Package: _/bash
     bash.sh exit code 254
Package: _/base-files
     base-files-mketc.sh exit code 254
     base-files-profile.sh exit code 254
Package: _/ca-certificates
     ca-certificates.sh exit code 254
Package: _/man-db
     man-db.sh exit code 254
Package: _/mintty
     mintty.sh exit code 254


The shell C:\Cygwin\bin\bash.exe can be launched, but any command fails 
to execute with:

bash-4.4$ ls
       1 [main] bash (6316) C:\Cygwin\bin\bash.exe: *** fatal error - 
cygheap base mismatch detected - 0x3922410/0x3962410.
This problem is probably due to using incompatible versions of the 
cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version 
*should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have


I do have another version of the cygwin dll file on the system (Plex 
installation) but that never caused any issues in the past.

Thanks for any tips?

--Andreas

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