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From: "mjw at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug testsuite/13332] New: skipped.exp testcase can freeze processes/system
Date: Sat, 22 Oct 2011 19:53:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=13332

             Bug #: 13332
           Summary: skipped.exp testcase can freeze processes/system
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
        AssignedTo: systemtap@sourceware.org
        ReportedBy: mjw@redhat.com
    Classification: Unclassified


When running skipped.exp (sudo make installcheck RUNTESTFLAGS=skipped.exp) my
machine sometimes acts up (frozen processes) and dmesg will show:
hrtimer: interrupt took 30006338 ns

Sometimes, though not often, the skipped.exp testcase itself will timeout.

This seem to be caused by this (guru) script:

global f
probe timer.profile { f++; snooze() }
function snooze() %{ udelay(10000); %}

It is run with:
stap -e $script -DMAXTRYLOCK=0 -DSTP_NO_OVERLOAD -tug

The purpose of the test seems to be to see whether global locks timeout.

Is there a better way to test this that doesn't cause such long interrupts
resulting in system/process freezes?

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