Difficulty: Medium · Puzzle 5 of 6 · Topic: Debugging Riddles
A test sometimes passes then later crashes with timeout fatal. Why can this happen?
fork
begin
wait(done);
end
begin
#1000 `uvm_fatal("TIMEOUT", "No completion")
end
join_any
// missing disable forkWhat happens to the losing forked branch after join_any?
1) join_any returns when first branch finishes (e.g., done becomes true).
2) Other branch keeps running unless explicitly killed.
3) Timeout branch later reaches #1000 and calls fatal, even though operation succeeded.
4) Add disable fork immediately after join_any, or use structured timeout utility that cancels losing branch.Answer: Missing `disable fork` leaves timeout thread alive; it fires later as a false fatal.
Believing join_any automatically terminates other branches.
How would you write the same logic using `process` handles for explicit kill?