Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/18465
FWIW, I don't know but I guess it happens randomly in the middle of any
tests. My wild guess is it is related with triggering many tests (or maybe
rebasing a lot to trigger the build). I saw it broke all other builds with -9
in all other PRs when it happens once. Resently I mapped the unknown codes
directly to be printed as above because I don't know the reason.
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