linux-kernel - Re: 2.6.23 regression: accessing invalid mmap'ed memory from gdb causes unkillable spinning

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Message-Id: <20071031.004425.12962203.davem@davemloft.net>
Date:	Wed, 31 Oct 2007 00:44:25 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	npiggin@...e.de
Cc:	duaneg@...da.com, mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: 2.6.23 regression: accessing invalid mmap'ed memory from gdb
 causes unkillable spinning

From: Nick Piggin <npiggin@...e.de>
Date: Wed, 31 Oct 2007 08:41:06 +0100

> On Tue, Oct 30, 2007 at 11:56:00PM -0700, David Miller wrote:
> > From: Nick Piggin <npiggin@...e.de>
> > Date: Wed, 31 Oct 2007 07:42:21 +0100
> > 
> > Anyways, my core suggestion is to add a hook here so platforms can
> > do the remote register fetch if they want.
> 
> You could possibly even do a generic "best effort" kind of thing with
> regular IPIs, that will timeout and continue if some CPUs don't handle
> them, and should be pretty easy to get working with existing smp_call_
> function stuff. Not exactly clean, but it would be better than nothing.

Without a doubt.
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