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From: Paul Larson <plars@linuxtestproject.org>
To: lkml <linux-kernel@vger.kernel.org>
Subject: LTP - gettimeofday02 FAIL
Date: 12 Nov 2002 16:11:14 -0600	[thread overview]
Message-ID: <1037139074.10626.37.camel@plars> (raw)

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I've been getting a somewhat random error in a few of the recent 2.5
kernels with SMP machines.  I noticed this on a 2.5.47 bk pull, but I
was also able to reproduce it on 2.5.46.  I haven't tried any earlier
kernels yet.  The LTP gettimeofday02 test sometimes fails with this
message:
gettimeofday02    0  INFO  :  checking if gettimeofday is monotonous,
takes 30s
gettimeofday02    1  FAIL  :  Time is going backwards (old
1037138184.846333 vs new 1037138184.843346!

I have not been able to reproduce this on a single processor machine
though.

Basically, all the test does is:
gettimeofday(&tv1, NULL);
while(!done) {
	gettimeofday(&tv2, NULL);
	FAIL if tv2 < tv1
	tv1 = tv2;
}

Any ideas on what could be causing this?

Thanks,
Paul Larson

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             reply	other threads:[~2002-11-12 22:07 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-11-12 22:11 Paul Larson [this message]
2002-11-14 21:52 ` LTP - gettimeofday02 FAIL Chris Wedgwood
2002-11-18 17:34   ` Paul Larson
2002-11-18 21:58     ` Chris Wedgwood
  -- strict thread matches above, loose matches on Subject: below --
2002-11-19  1:27 Jim Houston
2002-11-19 12:03 ` Andi Kleen

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