[C++][CI] Thread sanitizer failure in SerialExecutor

[asfimport]

Another ThreadSanitizer failure was found possibly resulting from ARROW-12208

Log: https://github.com/ursacomputing/crossbow/runs/2340248774 

Reporter: David Li / @lidavidm
Assignee: Antoine Pitrou / @pitrou

Related issues:

• [C++][CI] Thread sanitizer failure (relates to)
• [C++] Add the ability to run async tasks without using the CPU thread pool (relates to)

PRs and other links:

• GitHub Pull Request #10025

_{Note: This issue was originally created as ARROW-12379. Please see the migration documentation for further details.}

[asfimport]

David Li / @lidavidm:
Issue resolved by pull request 10025
#10025