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

From: Russell King
Date: Tue Sep 01 2009 - 10:26:50 EST

On Tue, Sep 01, 2009 at 02:54:54PM +0100, Catalin Marinas wrote:
> venki kaps <venkiece2005@xxxxxxxxx> 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 -
maintainer of:
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