vmm_tests: Fix serial interrupt test race - #4186
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Steven Malis (smalis-msft) merged 2 commits intoAug 7, 2026
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Pull request overview
This PR updates the PCIe multiarch VMM test that verifies IOAPIC interrupt remapping by generating larger serial output, reducing a race where the “after” /proc/interrupts snapshot could be taken before the serial transmission triggered interrupts.
Changes:
- Replace a small repeated
echoloop with a largerddwrite to overflow the tty transmit buffer and force interrupt-driven draining. - Add test-local documentation explaining why a larger write is required.
- Introduce a
TX_PAGESconstant to parameterize the amount of serial traffic generated.
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Chris Oo (chris-oo)
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Aug 7, 2026
Steven Malis (smalis-msft)
merged commit Aug 7, 2026
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Matt LaFayette (Kurjanowicz) (mattkur)
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Backported to release/1.8.2607 in #4194 |
Ben Hillis (benhillis)
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Write a larger amount of data to the serial device to ensure that it triggers interrupts as needed.