Today I was using CPAN to upgrade a Perl library under Cygwin. Between 5 and 10 out of 40 or 50 upgrade candidates (from an 'r' command) resulted in a problem like this:

cpan[2]> install Math::BigRat
Running install for module 'Math::BigRat'
Running make for L/LE/LETO/Math-BigRat-0.24.tar.gz
Checksum for /home/usb06693/.cpan/sources/authors/id/L/LE/LETO/Math-Bi
+gRat-0.24.tar.gz ok

  CPAN.pm: Going to build L/LE/LETO/Math-BigRat-0.24.tar.gz

      5 [main] perl 588 C:\cygwin\bin\perl.exe: *** fatal error - unab
+le to remap \\?\C:\cygwin\lib\perl5\5.10\i686-cygwin\auto\Digest
\SHA\SHA.dll to same address as parent: 0x542D0000 != 0x64940000
   2263 [main] perl 2564 fork: child 588 - died waiting for dll loadin
+g, errno 11
5396575 [main] perl 3484 C:\cygwin\bin\perl.exe: *** fatal error - una
+ble to remap \\?\C:\cygwin\lib\perl5\5.10\i686-cygwin\auto\Diges
t\SHA\SHA.dll to same address as parent: 0x542D0000 != 0x64940000
5408695 [main] perl 2564 fork: child 3484 - died waiting for dll loadi
+ng, errno 11
10685099 [main] perl 2860 C:\cygwin\bin\perl.exe: *** fatal error - un
+able to remap \\?\C:\cygwin\lib\perl5\5.10\i686-cygwin\auto\Dige
st\SHA\SHA.dll to same address as parent: 0x542D0000 != 0x64940000
10697460 [main] perl 2564 fork: child 2860 - died waiting for dll load
+ing, errno 11
[download]

The error kept recurring (with larger numbers preceding [main]) and I had to use the "Close" item in the upper-left corner of the Cygwin window to kill the execution.

Is such a problem familiar to anyone? Is there something I can do to fix it so these modules can be upgraded?

Best Regards,
cmac