linux-kernel - Re: BUG: mmapfile/writev spurious zero bytes (x86

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Message-ID: <20080618022115.GA1383@brong.net>
Date:	Wed, 18 Jun 2008 12:21:15 +1000
From:	Bron Gondwana <brong@...tmail.fm>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Bron Gondwana <brong@...tmail.fm>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rob Mueller <robm@...tmail.fm>
Subject: Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386,
	bisected, reproducable)

On Tue, Jun 17, 2008 at 10:08:24AM -0700, Linus Torvalds wrote:
> On Tue, 17 Jun 2008, Bron Gondwana wrote:
> > 
> > And I appear to have sent the one without the usage comments at the top.
> > Here they are:
> 
> Very interesting. There's certainly something there. 
> 
> That said, there's a distracting bug which is visible when doing an strace
> 
>  lseek(4, 140333890921392, SEEK_SET)     = -1 EINVAL (Invalid argument)
>  write(4, "\0\0\0\0", 4)                 = 4

Bah - crap.  Sorry about that.  I sent you the wrong version of the
code.  That's what I get for not putting it in revision control.

That bug exists because I did an htonl on a value that I shouldn't
have.

Bron ( now to read the rest of the thread! )
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