BUG: mmapfile/writev spurious zero bytes still in the wild

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To: Linus Torvalds <torvalds@...>
Cc: Bron Gondwana <brong@...>, Linux Kernel Mailing List <linux-kernel@...>, Nick Piggin <npiggin@...>, Andrew Morton <akpm@...>, Rob Mueller <robm@...>, Andi Kleen <andi@...>, Ingo Molnar <mingo@...>
Date: Friday, October 3, 2008 - 7:44 am

On Tue, Jun 17, 2008 at 02:20:49PM -0700, Linus Torvalds wrote:

[reminder from way back: this bug was caused by writev containing 
mmaped pages that weren't paged in, it's 64 bit only.  It
particularly affects Cyrus Imapd's database formats]


Has this been revisited since?  I haven't noticed, but I really only
skim LKML - have to save some time in the day for my real job[tm] of
keeping an email service running!


It's been fine for us since, but unfortunately most of the world is
still running distribution "stable" kernels.  I've just been helping a
user who's getting corrupted flat file databases on Ubuntu's stable 64
bit xen kernels, and it looks like it's the same issue.

Is there a standard way to tell backporters "you really need to add this
patch for your users' sanity"?

Bron ( I tried reporting it in Launchpad, but kept getting timeout
       errors, so I figured reposting here might get noticed.  Besides,
			 I can follow up on the "more complete fix" at the same time! )
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BUG: mmapfile/writev spurious zero bytes still in the wild, Bron Gondwana, (Fri Oct 3, 7:44 am)