linux-kernel - Re: [tip:x86/mm] x86, mm: NX protection for kernel data

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Message-ID: <817ecb6f1003100706l88ceffp72fd8c72d34a9fd8@mail.gmail.com>
Date:	Wed, 10 Mar 2010 10:06:58 -0500
From:	Siarhei Liakh <sliakh.lkml@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>, mingo@...hat.com,
	jmorris@...ei.org, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com, tglx@...utronix.de, jiang@...ncsu.edu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/mm] x86, mm: NX protection for kernel data

>> Any suggestions on how should I proceed forward in troubleshooting this issue?
>
> Can you reproduce it in KVM?

Yes, it crashes in KVM.

> If yes then that might give you a more debuggable state than a crashed native
> system.

Running kernel in KVM under kgdb with a watchpoint set for
($eip>=_etext)&&($eip<=_edata) still produces a dump but without ever
triggering the watchpoint.
I was hoping that some Kernel Locking Guru would say "take a look at
__xxx_yyy_zzz(), the things it does always looked suspicious to me."
:)

But joking aside, I would really appreciate ANY advice on debugging
this problem, as my best idea at this point is to pretty much
single-step through the whole thing... And since I am not familiar
with lock debugging at all, this will take a long time to figure out
on my own.

Thank you, guys.
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