nealrichardson opened a new pull request #7222:
URL: https://github.com/apache/arrow/pull/7222
Errors like:
```
:: Processing package changes...
upgrading msys2-runtime...
1 [main] pacman (5452)
C:\hostedtoolcache\windows\Ruby\2.6.6\x64\msys64\usr\bin\pacman.exe: *** fatal
error - cygheap base mismatch detected - 0x180330408/0x180317408.
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
installed the cygwin distribution. Rebooting is also suggested if you
are unable to find another cygwin DLL.
0 [main] pacman 444 dofork: child -1 - forked process 5452 died
unexpectedly, retry 0, exit code 0xC0000142, errno 11
```
Trying the workaround noted on
https://github.com/actions/virtual-environments/issues/594
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