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

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Message-Id: <1213682570.13708.1258839317@webmail.messagingengine.com>
Date:	Tue, 17 Jun 2008 16:02:50 +1000
From:	"Bron Gondwana" <brong@...tmail.fm>
To:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Nick Piggin" <npiggin@...e.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	" Rob Mueller" <robm@...tmail.fm>
Subject: Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386,
 bisected, reproducable)


On Tue, 17 Jun 2008 16:00:10 +1000, "Bron Gondwana" <brong@...tmail.fm> said:
> I apologise for the length of the attached C program.  I tried
> to make it shorter, but kept not tickling the bug.  There's also
> another advantage of keeping it like this - it closely mirrors the
> Cyrus behaviour, to the point where the output is a valid skiplist
> file.

And I appear to have sent the one without the usage comments at the top.
Here they are:

 * USAGE:
 *    $ gcc -g maptest.c
 *    $ ./a.out z
 *    $ hexdump -C z.NEW
 *
 * Notice the block of zero byte records appearing within
 * the output.
 *
 * Run with a second argument:
 *
 *    $ ./a.out z 1
 *    $ hexdump -C z.NEW
 *
 * No more zeros!

Bron.
-- 
  Bron Gondwana
  brong@...tmail.fm

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