linux-kernel - Re: [PATCH 0/4] Remove interrupt stack table usage from x86

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Message-ID: <4956A142.6010207@redhat.com>
Date:	Sat, 27 Dec 2008 23:42:26 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"H. Peter Anvin" <hpa@...or.com>, jeremy@...p.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 0/4] Remove interrupt stack table usage from x86_64	kernel
 (v2)

Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
>
>   
>> They have the following commit IDs, and they are also in tip/master:
>>
>>  921e521: x86: move NMI back to interrupt stack
>>  36ef6c9: x86: make interrupt stack switching atomic
>>  dd64891: x86: consolidate irq stack switching to a single macro
>>  955a368: x86: drop the use of the tss interrupt stack table (IST)
>>
>> I also started testing them in tip-qa.
>>     
>
> testing failed quickly, the attached config crashes. I've pushed out the 
> bad kernel to the tip/tmp.master.bad branch:
>
>  fe3aac9: Merge branch 'x86/irq'
>
> (no crashlog available - all i know that the box crashed and rebooted, 
> when booted with the bzImage built out of the attached config.)
>   

I managed to reproduce this (after several hundred million interrupts 
and several dozen million NMIs - do you run anything special on your tests?)

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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