[Bug 273481] kyua occasionally crashing during CI runs

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273481

            Bug ID: 273481
           Summary: kyua occasionally crashing during CI runs
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: markj@FreeBSD.org
                CC: lwhsu@FreeBSD.org

Most recently: https://ci.freebsd.org/job/FreeBSD-main-amd64-test/24090/console

10:15:02 bin/cp/cp_test:matching_srctgt_link  ->  passed  [0.034s]
10:15:02 bin/cp/cp_test:matching_srctgt_nonexistent  ->  passed  [0.034s]
10:15:02 bin/cp/cp_test:recursive_link_Hflag  ->  passed  [0.031s]
10:15:02 bin/cp/cp_test:recursive_link_Lflag  ->  ***
/usr/src/contrib/kyua/utils/process/executor.cpp:779: Invariant check failed:
PID 39046 already in all_exec_handles; not properly cleaned up or reused too
fast
10:15:02 *** Fatal signal 6 received
10:15:02 *** Log file is /.kyua/logs/kyua.20230831-145331.log
10:15:02 *** Please report this problem to kyua-discuss@googlegroups.com
detailing what you were doing before the crash happened; if possible, include
the log file mentioned above
10:15:02 pid 790 (kyua), jid 0, uid 0: exited on signal 6 (core dumped)

Lately it looks like 1 out of every ~5 runs suffers from the same problem.  It
doesn't appear to be triggered by any specific tests.

It looks like kyua is invoked with a plain "kyua test", i.e., no parallelism.

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