linux-kernel - Re: nanosleep truncated on 64 bit Linux by 292 billion years

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Message-ID: <alpine.DEB.2.11.1410281644070.5308@nanos>
Date:	Tue, 28 Oct 2014 16:45:00 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Pádraig Brady <P@...igBrady.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Paul Eggert <eggert@...ucla.edu>,
	bug-gnulib <bug-gnulib@....org>
Subject: Re: nanosleep truncated on 64 bit Linux by 292 billion years

On Mon, 27 Oct 2014, Pádraig Brady wrote:
> I noticed that nanosleep() on 64 bit, "only" supports 292 years,
> rather than the full potential 292 billion years with 64 bit time_t, due to:
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/linux/time.h?id=refs/tags/v3.16#n87
> 
> Attached is a program from Paul Eggert that illustrates the bug.
> Running this program on a buggy host outputs something like this:
> 
>   Setting alarm for 1 second from now ...
>   Sleeping for 9223372036854775807.999999999 seconds...
>   After alarm sent off, remaining time is 9223357678.462306617 seconds;
>   i.e., nanosleep claimed that it slept for about 293079448610.606445 years.

I'm aware of the issue. It's on my ever growing todo list.

Thanks,

	tglx