Re: [Bug #11970] gettimeofday return a old time in mmbench

[Ingo Molnar]

* Rafael J. Wysocki <rjw@xxxxxxx> wrote:

> This message has been generated automatically as a part of a report
> of recent regressions.
> 
> The following bug entry is on the current list of known regressions
> from 2.6.27.  Please verify if it still should be listed and let me know
> (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11970
> Subject		: gettimeofday return a old time in mmbench
> Submitter	: alexs <alex.shi@xxxxxxxxx>
> Date		: 2008-11-06 23:57 (28 days old)
> First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=99ebcf8285df28f32fd2d1c19a7166e70f00309c
> Handled-By	: Ingo Molnar <mingo@xxxxxxx>
> 		  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> 		  Yanmin Zhang <yanmin_zhang@xxxxxxxxxxxxxxx>

fixed by the patch below from John Stultz, queued up in 
tip/timers/urgent.

The bisection-blamed merge commit above likely just causes a random shift 
in the timings or compiler optimization conditions of this code - making 
the bug more likely to trigger. The bug/race itself is old.

	Ingo

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