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test: harden test_vmm_allocate_zero_size against parallel-run flakes #3010

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Merged
leofang merged 1 commit into from
Oct 3, 2026
+5 −2
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test: harden test_vmm_allocate_zero_size against parallel-run flakes #3010

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7 changes: 5 additions & 2 deletions cuda_core/tests/test_memory.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1765,6 +1765,7 @@ def test_vmm_host_modify_allocation_rejects_exportable_handle_type(init_cuda):


@pytest.mark.agent_authored(model="claude-fable-5-1")
@pytest.mark.thread_unsafe(reason="records process-global warnings")
def test_vmm_allocate_zero_size(init_cuda):
"""allocate(0) returns an empty buffer without a driver call; a grow of it inherits its stream."""
device = _vmm_device_or_skip()
Expand All @@ -1780,10 +1781,12 @@ def test_vmm_allocate_zero_size(init_cuda):
# The grown buffer's deallocation is ordered on the stream passed to
# allocate(0): its close waits for the work queued there. The sleep
# kernel does not touch the buffer, so a missing wait fails the event
# check instead of faulting.
# check instead of faulting. The close is wrapped so a skipped sync
# surfaces as a CUDAWarning instead of a bare event-check failure.
NanosleepKernel(device, sleep_duration_ms=200).launch(s)
done = s.record()
grown.close()
with assert_no_cuda_warning():
grown.close()
assert done.is_done
buf.close()
finally:
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