Re: [Bugme-new] [Bug 8479] New: gettimeofday returning 1000000 in tv_usec on core2duo

[Andrew Morton <akpm@linux-foundation.org>]

On Mon, 14 May 2007 21:17:47 -0700 bugme-daemon@bugzilla.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@suse.de
>          Submitter: dang@gentoo.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.