Re: kernel BUG at mm/page-writeback.c:2317!

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On Tue, Oct 08, 2013 at 12:36:11AM +0200, Jan Killius wrote:
> Hello,
> I'm hitting similar bug with the patch from Lui Bo.
> But If I revert: 573aecafca1cf7a974231b759197a1aebcf39c2a,
> Btrfs: actually limit the size of delalloc range) everything works fine.
> 
> Here are the 2 backtraces from my machines with 3.12-rc4:
> http://imgur.com/sVkjGK6,mWUtzMV#0
> http://imgur.com/sVkjGK6,mWUtzMV#1
> 
> Sorry for the screenshots but It was the only way to capture the backtraces.
> I get the bug at the end of a 2GB scp transfer almost everytime.

So I thought about it and I came up with this patch but as I was writing out the
explanation I realized I was wrong in some of my assumptions.  However I'd still
like you to give it a whirl and see if it fixes the problem and I'll take a
fresh look at it tomorrow

http://paste.fedoraproject.org/44986/38119874/

Thanks,

Josef
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