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

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Message-ID: <49766FF0.9040401@cn.fujitsu.com>
Date:	Wed, 21 Jan 2009 08:44:32 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	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!

>>> 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>


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