release-20.1: kv: declare write access to AbortSpan on all aborting EndTxn reqs #48410
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Backport 1/1 commits from #48245.
/cc @cockroachdb/release
Fixes #43707.
Fixes #48046.
Fixes #48189.
Part of the change made by #42765 was to clear AbortSpan entries on
non-poisoning, aborting EndTxn requests. Specifically, this change was
made in 1328787. The change forgot to update the corresponding span
declaration logic to reflect the fact that we were now writing to the
AbortSpan in cases where we previously weren't.
This was triggering an assertion in race builds that tried to catch this
kind of undeclared span access. The assertion failure was very rare
because it required the following conditions to all be met:
We should backport this when we get a change (once v20.1.0 has
stabilized), but I don't expect that this could actually cause any
issues. The AbortSpan update was strictly a matter of performance and we
should never be racing with another request that is trying to read the
same AbortSpan entry.