linux-kernel - Re: ARM + jprobes/kretprobes SEGV/hangs/OOPS in 2.6.29 kernel

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Date:	Tue, 1 Sep 2009 15:25:49 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	venki kaps <venkiece2005@...il.com>, Nicolas Pitre <nico@....org>,
	"sagar.abhishek@...il.com" <sagar.abhishek@...il.com>,
	"jkenisto@...ibm.com" <jkenisto@...ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"prasanna@...ibm.com" <prasanna@...ibm.com>
Subject: Re: ARM + jprobes/kretprobes SEGV/hangs/OOPS in 2.6.29 kernel

On Tue, Sep 01, 2009 at 02:54:54PM +0100, Catalin Marinas wrote:
> venki kaps <venkiece2005@...il.com> wrote:
> > I have found the exact problem with respect to ARM jprobes.
> >
> > The problem with configure i.e, CONFIG_ARM_UNWIND = y; is enabled.
> 
> I haven't followed the kprobes implementation for ARM but does it make
> any assumptions about the existence of a frame pointer on the stack?
> Enabling stack unwinding automatically disables the framepointer.

If it uses CALLER_ADDRESSx() then it won't work with unwinding enabled.
See 5613/1 (which is pending in the devel branch.)

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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