linux-kernel - RE: linux-next: Tree for June 3

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Message-ID: <987664A83D2D224EAE907B061CE93D530114C3DC47@orsmsx505.amr.corp.intel.com>
Date:	Fri, 4 Jun 2010 13:46:49 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Dave Young <hidave.darkstar@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: RE: linux-next: Tree for June 3

> What does a NaT consumption fault mean, and does it give the invalid 
> address it was loaded off?

This almost always means that we dereferenced a NULL pointer ... though
any access into the bottom PAGE_SIZE of kernel virtual address space
will result in this trap.  This happens on ia64 because we have a "NaT"
page mapped at 0x0 so that speculative loads that chase NULL pointers
at the end of lists behave more rationally.

Sadly I don't have the actual address. The register that was used
for the dereference isn't included in the OOPS output.

-Tony
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