linux-kernel - Re: [Bugme-new] [Bug 8479] New: gettimeofday returning 1000000 in tv

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Message-ID: <464F09F6.6080000@tmr.com>
Date:	Sat, 19 May 2007 10:30:14 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Eric Dumazet <dada1@...mosbay.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>,
	linux-kernel@...r.kernel.org,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>, dang@...too.org,
	Andi Kleen <ak@...e.de>, stable@...nel.org
Subject: Re: [Bugme-new] [Bug 8479] New: gettimeofday returning 1000000 in
   tv_usec on core2duo

Andrew Morton wrote:
> On Tue, 15 May 2007 08:06:52 +0200 Eric Dumazet <dada1@...mosbay.com> wrote:
> 
>> Andrew Morton a écrit :
>>> On Mon, 14 May 2007 21:17:47 -0700 bugme-daemon@...zilla.kernel.org wrote:
>>>
>>>> http://bugzilla.kernel.org/show_bug.cgi?id=8479
>>>>
>>>>            Summary: gettimeofday returning 1000000 in tv_usec on core2duo
>>>>     Kernel Version: 2.6.21
>>>>             Status: NEW
>>>>           Severity: normal
>>>>              Owner: ak@...e.de
>>>>          Submitter: dang@...too.org
>>>>
>>>>
>>>> Most recent kernel where this bug did *NOT* occur: 2.6.20
>>>> Distribution: Gentoo
>>>> Hardware Environment: core2duo T7200 (all reporters had this same CPU)
>>>> Software Environment: Linux 2.6.21, glibc 2.5
>>>> Problem Description:
>>>>
>>>> gettimeofday returns 1 - 1000000 in tv_usec, not 0 - 999999 
>>>> This does not happen on any of my AMD-based 32 or 64 bit boxes, only on my
>>>> core2duo; I have 2 other reports of this problem, all on T7200's
>>>>
>>>> Steps to reproduce:
>>>>
>>>> call gettimeofday a lot.  Eventually, you'll get 1000000 returned in tv_usec. My
>>>> average is ~1 in 1000000 calls.  I've attached my test program, with output from
>>>> various boxes.  One of the other reporters tried the test program too, and got
>>>> similar output.  .config will be attached too.
>>> err, whoops.
>> I remember I already hit this and corrected it
>>
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blobdiff;f=arch/x86_64/kernel/vsyscall.c;h=dc32cef961950915fbaa185e36ab802d5f7cea3b;hp=ba330f87067996a17495f7d03466d646c718b52c;hb=c8118c6c07f2edfd697aaa0b93e08c3b65a5a675;hpb=272a3713bb9e302e0455c894c41180a482d2c8a3
> 
> Oh, OK.
> 
>> Maybe a stable push is necessary ?
> 
> yup.  Please always think of -stable when preparing fixes.  I'm sure many
> useful fixes are slipping past simply because those who _are_ looking out
> for backportable fixes are missing things.
> 
That makes me feel better, I have been occasionally suggesting fixes 
posted here as candidates for stable, I was afraid I was being a PITA. I 
forgot about the "stable" address and have been bugging greg, I'll stop 
that.

> Greg, Chris: please consider c8118c6c07f2edfd697aaa0b93e08c3b65a5a675
> for -stable, if it isn't already there.


-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

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