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Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, bisected, reproducable)

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From: Linus Torvalds <torvalds@...>
To: Andi Kleen <andi@...>
Cc: Al Viro <viro@...>, Bron Gondwana <brong@...>, Linux Kernel Mailing List <linux-kernel@...>, Nick Piggin <npiggin@...>, Andrew Morton <akpm@...>, Rob Mueller <robm@...>, Ingo Molnar <mingo@...>
Subject: Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, bisected, reproducable)
Date: Tuesday, June 17, 2008 - 5:49 pm

On Tue, 17 Jun 2008, Andi Kleen wrote:

No. 

I *know* that copy_to/from_user() is supposed to return the number of 
bytes not copied.

And if you loaded a value but didn't store it to the destination, then BY 
DEFINITION you didn't copy it.

Comprende?

Obviously you don't.

Gaah. Why do I keep bothering to even _try_ to educate you? Can't you 
accept that I just fixed a bug, which had a test-case an everything?

Andi, really. Take it from me. If I tell you something, I'm usually right. 
Think about that for a moment, instead of living in your own little 
dream-world where you think you understand everything.

		Linus
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Messages in current thread:
BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, b..., Bron Gondwana, (Tue Jun 17, 2:00 am)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Bron Gondwana, (Tue Jun 17, 2:02 am)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 1:08 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Bron Gondwana, (Tue Jun 17, 10:21 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 1:45 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 4:16 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 4:58 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:14 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:26 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:31 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:34 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:46 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Nick Piggin, (Wed Jun 18, 2:10 am)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:34 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 4:41 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:15 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:06 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:20 pm)
BUG: mmapfile/writev spurious zero bytes still in the wild, Bron Gondwana, (Fri Oct 3, 7:44 am)
Re: BUG: mmapfile/writev spurious zero bytes still in the wild, Andrew Morton, (Fri Oct 3, 9:07 am)
Re: BUG: mmapfile/writev spurious zero bytes still in the wild, Bron Gondwana, (Fri Oct 3, 8:13 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Bron Gondwana, (Tue Jun 17, 11:14 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Wed Jun 18, 12:03 am)
Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/writev..., Bron Gondwana, (Wed Jun 18, 1:11 am)
Re: Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/wr..., Linus Torvalds, (Wed Jun 18, 12:22 pm)
Re: Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/wr..., Robert Mueller, (Wed Jun 18, 7:45 pm)
Re: Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/wr..., Linus Torvalds, (Wed Jun 18, 8:20 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Bron Gondwana, (Tue Jun 17, 10:27 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:16 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:24 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Al Viro, (Tue Jun 17, 5:36 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:42 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Al Viro, (Tue Jun 17, 6:11 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 6:21 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386,, Nick Piggin, (Wed Jun 18, 2:22 am)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:49 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Andi Kleen, (Tue Jun 17, 5:30 pm)
Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i38..., Linus Torvalds, (Tue Jun 17, 5:37 pm)