[Bug testsuite/13332] New: skipped.exp testcase can freeze processes/system

[Bug testsuite/13332] New: skipped.exp testcase can freeze processes/system

[mjw at redhat dot com]

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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[Bug testsuite/13332] skipped.exp testcase can freeze processes/system

[mjw at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13332

--- Comment #1 from Mark Wielaard <mjw at redhat dot com> 2011-11-07 10:53:15 UTC ---
Since this test keep messing up systems I have made it UNTESTED for now:

commit 3780aaa7c3ddd4af58adcb24c186af0738340935
Author: Mark Wielaard <mjw@redhat.com>
Date:   Mon Nov 7 11:52:17 2011 +0100

    PR13332 skipped.exp testcase can freeze processes/system.

    Mark skipped.exp as untested for now.

diff --git a/testsuite/systemtap.base/skipped.exp
b/testsuite/systemtap.base/skipped.exp
index 0239efc..bfb74ee 100644
--- a/testsuite/systemtap.base/skipped.exp
+++ b/testsuite/systemtap.base/skipped.exp
@@ -5,6 +5,10 @@ if {! [installtest_p]} { untested $test; return }
 set nr_cpus [exec sh -c "grep ^processor /proc/cpuinfo | wc -l"]
 if {$nr_cpus < 2} { unsupported $test; return }

+# See PR13332 skipped.exp testcase can freeze processes/system
+untested "$test PR13332 skipped.exp testcase can freeze processes/system"
+return
+
 set script {
 global f
 probe timer.profile { f++; snooze() }

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