ARROW-8857: [CI] MinGW builds break on system upgrade

[nealrichardson]

Errors like this on MinGW GitHub Actions (Ruby and R) builds:

:: 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

Example: https://github.com/apache/arrow/pull/7218/checks?check_run_id=687127312

Trying the workaround noted on actions/runner-images#594

[github-actions]

Thanks for opening a pull request!

Could you open an issue for this pull request on JIRA?
https://issues.apache.org/jira/browse/ARROW

Then could you also rename pull request title in the following format?

ARROW-${JIRA_ID}: [${COMPONENT}] ${SUMMARY}

See also:

• Other pull requests
• Contribution Guidelines - How to contribute patches

[nealrichardson]

That didn't help. @kou any ideas? For the R and Ruby builds, I see it passing 19 hours ago and the first failure was 9 hours ago.

Interestingly, the R Windows job using the new RTools toolchain (still mingw) does not crash like this. It seems that it is the pacman system upgrade that triggers this, and that other job doesn't call that (it's conditionally enabled here: https://github.com/apache/arrow/blob/master/ci/scripts/r_windows_build.sh#L26-L30).

[nealrichardson]

Old issue that sounds similar: Alexpux/MSYS2-pacman#38

[nealrichardson]

Looks like skipping the system upgrade fixes the R build, but GLib needs updated meson? Maybe that can be updated selectively.

[github-actions]

https://issues.apache.org/jira/browse/ARROW-8857

[kou]

Could you try updating pacman separately like https://github.com/apache/arrow/pull/7229/files#diff-f9a9850561dea0df3b66b2ff57181037 ?

[nealrichardson]

I think I don't need to update pacman for the R jobs. Is there a reason I must?

[kou]

OK. Then we don't need to update in the R jobs.
Could you revert the change in ci/scripts/msys2_system_upgrade.sh? It's fixed by #7229 .

[nealrichardson]

I pulled that change into #7218 so I'll close this.