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T13701 fails sporadically

    • Closed Issue created by Douglas Wilson @duog

    T13701 fails sporadically, comments in D3586 indicate that it happens while the system is under load.

    I reproduced this issue by duplicating T13701 7 times, making tests T13701[A-H], then running

    make test TEST="T13701A T13701B T13701C T13701D T13701E T13701F T13701G T13701H THREADS=8"

    on my box with 4 cpus.

    Comparing profiling reports of the test under and not under load, I found the additional allocations to be in SysTools.builderMainLoop.loop. This function busy-waits from when 2 EOFs are received until getProcessExitCode returns a Just. That this is the cause was verified by changing

    | otherwise -> loop chan hProcess t p exitcode

    to

    | otherwise -> threadDelay 10000 >> loop chan hProcess t p exitcode
    Trac metadata
    Trac field Value
    Version 8.3
    Type Bug
    TypeOfFailure OtherFailure
    Priority normal
    Resolution Unresolved
    Component Test Suite
    Test case
    Differential revisions
    BlockedBy
    Related
    Blocking
    CC
    Operating system
    Architecture
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