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DragonFly bugs List (threaded) for 2009-10
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Re: bad awk output on vkernel

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Fri, 2 Oct 2009 14:15:26 -0700 (PDT)

:I'd like to add this as a bug so as it's not forgotten, or attract
:someone else's attention.  It also seems to affect pkgsrc packages
:using awk in its configure script, for instance.
:> I'd say it's not a pipe issue, but specific to running awk on vkernel,
:> because this perl version never produces bad output on vkernel:

    I've reproduced the problem in the vkernel.

    I reproduced your sorting test, where commenting out the
    core of the sort code makes the problem occur less often.
    When it did mess up I got:

    /usr/bin/awk: trying to access out of range field -2147483648
     input record number 819, file common.opt
      source line number 41

    I replaced the /bin/sh last=`...` backtick assignment with a
    redirect to a file and that file showed corruption, so we can
    rule out /bin/sh's variable assignment.

    I think what we are seeing is either VM memory corruption in the
    vkernel implementation, which seems unlikely because the VM system
    is not being stressed, or execution state corruption.  I kinda
    suspect the cpu flags... maybe the direction flag is getting
    corrupted.  I am looking into it.

					Matthew Dillon 

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