linux-kernel - Re: [PATCH] x86: sysctl to allow panic on IOCK NMI error

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Message-ID: <20090630223040.GA3802@suse.de>
Date:	Tue, 30 Jun 2009 15:30:40 -0700
From:	Greg KH <gregkh@...e.de>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Kurt Garloff <garloff@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: sysctl to allow panic on IOCK NMI error

On Tue, Jun 30, 2009 at 11:27:57PM +0100, Maciej W. Rozycki wrote:
> On Wed, 24 Jun 2009, Greg KH wrote:
> 
> > This patch introduces a sysctl /proc/sys/kernel/panic_on_io_nmi, which
> > defaults to 0 (off).
> > 
> > When enabled, the kernel panics when the kernel receives an NMI caused
> > by an IO error.
> > 
> > The IO error triggered NMI indicates a serious system condition, which
> > could result in IO data corruption. Rather than contiuing, panicing and
> > dumping might be a better choice, so one can figure out what's causing
> > the IO error.
> > 
> > This could be especially important to companies running IO intensive
> > applications where corruption must be avoided, e.g. a banks databases.
> 
>  These days an IOCK NMI typically happens in response to a PCI SERR -- it 
> may be useful to traverse PCI buses to find the offender and dump this 
> information on this occasion too.  The south bridge may have additional 
> status too.

Sure, that would be great to have.  Care to make a patch?  :)

thanks,

greg k-h
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