linux-kernel - Re: Linux 2.6.20-rc6

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Message-ID: <45C0B570.4000000@garzik.org>
Date:	Wed, 31 Jan 2007 10:27:44 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.20-rc6 - sky2 resume breakage

Ingo Molnar wrote:
> * Jeff Garzik <jeff@...zik.org> wrote:
> 
>> Easy to name an example, as they are pretty generic.  When sharing 
>> irqs -- usually ATA is configured to PCI native (IO-APIC-fasteoi) -- 
>> any interrupt storm causes the other devices sharing that irq to crap 
>> themselves (kernel turns off irq, suggests irqpoll, etc.)
> 
> ok. Can you suggest any way for me to reproduce such a bug artificially 
> on a test system? [i have both old and new systems, so if you can think 
> of a way for me to trigger this i'd be happy to try]

Should be pretty easy.  With either the old-IDE driver or libata, 
complete a command without acknowledging an interrupt.  For libata, that 
means poking around in ata_host_intr() and avoiding well-built hardware 
like AHCI.  Anything that uses ata_piix driver, basically all Intel 
machines, should be applicable in the "not well built" category... :)

	Jeff



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