> [Checker] Start a DFS exploration. Reduction is: dpor.
> [Checker] Execute 1: BARRIER_ASYNC_LOCK(barrier: 0) (stack depth: 1, state: 1, 0 interleaves)
> [Checker] Execute 1: BARRIER_WAIT(barrier: 0) (stack depth: 2, state: 2, 0 interleaves)
+> [Checker] There remains 0 actors, but none to interleave (depth 4).
> [Checker] Execution came to an end at 1;1;0 (state: 3, depth: 3)
> [Checker] Backtracking from 1;1;0
> [Checker] DFS exploration ended. 3 unique states visited; 1 backtracks (3 transition replays, 0 states visited overall)
> [Checker] Dependent Transitions:
> [Checker] BARRIER_ASYNC_LOCK(barrier: 0) (state=1)
> [Checker] BARRIER_WAIT(barrier: 0) (state=4)
+> [Checker] There remains 0 actors, but none to interleave (depth 6).
> [Checker] Execution came to an end at 1;2;1;2;0 (state: 5, depth: 5)
> [Checker] Backtracking from 1;2;1;2;0
> [Checker] Execute 2: BARRIER_ASYNC_LOCK(barrier: 0) (stack depth: 1, state: 1, 0 interleaves)
> [Checker] Dependent Transitions:
> [Checker] BARRIER_ASYNC_LOCK(barrier: 0) (state=6)
> [Checker] BARRIER_WAIT(barrier: 0) (state=8)
+> [Checker] There remains 0 actors, but none to interleave (depth 6).
> [Checker] Execution came to an end at 2;1;1;2;0 (state: 9, depth: 5)
> [Checker] Backtracking from 2;1;1;2;0
> [Checker] DFS exploration ended. 9 unique states visited; 2 backtracks (10 transition replays, 0 states visited overall)
> [Checker] Dependent Transitions:
> [Checker] BARRIER_ASYNC_LOCK(barrier: 0) (state=2)
> [Checker] BARRIER_WAIT(barrier: 0) (state=6)
+> [Checker] There remains 0 actors, but none to interleave (depth 8).
> [Checker] Execution came to an end at 1;2;3;1;2;3;0 (state: 7, depth: 7)
> [Checker] Backtracking from 1;2;3;1;2;3;0
> [Checker] Execute 3: BARRIER_ASYNC_LOCK(barrier: 0) (stack depth: 2, state: 2, 0 interleaves)
> [Checker] Dependent Transitions:
> [Checker] BARRIER_ASYNC_LOCK(barrier: 0) (state=8)
> [Checker] BARRIER_WAIT(barrier: 0) (state=11)
+> [Checker] There remains 0 actors, but none to interleave (depth 8).
> [Checker] Execution came to an end at 1;3;2;1;2;3;0 (state: 12, depth: 7)
> [Checker] Backtracking from 1;3;2;1;2;3;0
> [Checker] DFS exploration ended. 12 unique states visited; 2 backtracks (14 transition replays, 1 states visited overall)
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