linux-kernel - Re: [BUG] kernel BUG at arch/x86/kernel/tlb

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Date:	Wed, 21 Jan 2009 06:31:42 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Nick Piggin <npiggin@...e.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mike Travis <travis@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [BUG] kernel BUG at arch/x86/kernel/tlb_32.c:130!

On Wed, 2009-01-21 at 08:44 +0800, Li Zefan wrote:
> >>> okay, a testsystem of mine just triggered this crash too.
> >>>
> >>> Li Zefan, Jaswinder, does the patch below fix it for you?
> >>>
> >> I'll test it, but I have to run for several hours to confirm it, since 
> >> the bug is not easy to trigger. :)
> > 
> > yes. It triggered on an old 32-bit dual-socket HyperThreading system for 
> > me and that is because HyperThreading is very good at triggering narrow 
> > SMP races. (which this one certainly is)
> > 
> > (I'd expect Nehalem to trigger this TLB flushing race more easily too, 
> > where HyperThreading made a comeback.)
> > 
> 
> Nothing bad happaned in the last 16+ hours. :)
> 
> Tested-by: Li Zefan <lizf@...fujitsu.com>
> 

And my HT machine is also happy with this patch :-)

--
JSR

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