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

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

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From: Linus Torvalds

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

Date: Tuesday, June 17, 2008 - 2:34 pm

On Tue, 17 Jun 2008, Linus Torvalds wrote:
quoted text> 
> It is "copy_user". Notice the lack of "from" or "to". That code handles 
> *both* copy_to_user and copy_from_user.

Oh, and yes, I said "copy_to_user_inatomic()" by mistake. The fact is that 
"write()" obviously does copy_from_user, but more importantly that on x86 
it's THE EXACT SAME ROUTINE. 

			Linus
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Messages in current thread:

BUG: mmapfile/writev spurious zero bytes (x86_64/not i386, ..., Bron Gondwana, (Mon Jun 16, 11:00 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Bron Gondwana, (Mon Jun 16, 11:02 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 10:08 am)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 10:45 am)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 1:16 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 1:41 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Andi Kleen, (Tue Jun 17, 1:58 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 2:06 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 2:14 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Andi Kleen, (Tue Jun 17, 2:15 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Andi Kleen, (Tue Jun 17, 2:16 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 2:20 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 2:24 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Andi Kleen, (Tue Jun 17, 2:26 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Andi Kleen, (Tue Jun 17, 2:30 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 2:31 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 2:34 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Andi Kleen, (Tue Jun 17, 2:34 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Al Viro, (Tue Jun 17, 2:36 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 2:37 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Andi Kleen, (Tue Jun 17, 2:42 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 2:46 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 2:49 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Al Viro, (Tue Jun 17, 3:11 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Andi Kleen, (Tue Jun 17, 3:21 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Bron Gondwana, (Tue Jun 17, 7:21 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Bron Gondwana, (Tue Jun 17, 7:27 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Bron Gondwana, (Tue Jun 17, 8:14 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Linus Torvalds, (Tue Jun 17, 9:03 pm)

Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/writ ..., Bron Gondwana, (Tue Jun 17, 10:11 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i ..., Nick Piggin, (Tue Jun 17, 11:10 pm)

Re: BUG: mmapfile/writev spurious zero bytes (x86_64/not i386,, Nick Piggin, (Tue Jun 17, 11:22 pm)

Re: Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/ ..., Linus Torvalds, (Wed Jun 18, 9:22 am)

Re: Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/ ..., Robert Mueller, (Wed Jun 18, 4:45 pm)

Re: Cyrus mmap vs lseek/write usage - (WAS: BUG: mmapfile/ ..., Linus Torvalds, (Wed Jun 18, 5:20 pm)

BUG: mmapfile/writev spurious zero bytes still in the wild, Bron Gondwana, (Fri Oct 3, 4:44 am)

Re: BUG: mmapfile/writev spurious zero bytes still in the wild, Andrew Morton, (Fri Oct 3, 6:07 am)

Re: BUG: mmapfile/writev spurious zero bytes still in the wild, Bron Gondwana, (Fri Oct 3, 5:13 pm)

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