linux-kernel - Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c

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Date:	Tue, 26 Aug 2008 12:35:16 -0700
From:	Mike Travis <travis@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"Alan D. Brunelle" <Alan.Brunelle@...com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Luck, Tony" <tony.luck@...el.com>, Jack Steiner <steiner@....com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c - bisected

Linus Torvalds wrote:
> 
> On Tue, 26 Aug 2008, Mike Travis wrote:
>> The need to allow distros to set NR_CPUS=4096 (and NODES_SHIFT=9) is
>> critical to our upcoming SGI systems using what we have been calling
>> "UV".
> 
> That's fine. You can do it. The default kernel will not, because it's 
> clearly not safe.
> 
> I really don't care what you do to _your_ images. But I will not 
> distribute a known-broken kernel, and I will not debug random stack 
> overflows that happen in it.
> 
> If you want the default kernel to support 4k cores, we'll need to fix the 
> stack usage.  I don't think that is impossible, but IT IS NOT GOING TO 
> HAPPEN for 2.6.27.
> 
> And quite frankly, if some vendor like RedHat enables NR_CPUS=4096 by 
> default, they are totally and utterly crazy.
> 
> But some SGI-specific binary that is meant for SGI machines only, and has 
> been extensively tested with the setup used on SGI machines is a different 
> thing.
> 
> 			Linus

Ok, thanks for the reply, and looking into this issue.  We will "strongly
encourage" our distros to base the relevant releases on 2.6.28. :-)  

[Supplying an SGI-specific kernel would not be acceptable to many of our
customers because of the certification issues I mentioned.] 

Mike
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