linux-kernel - Re: [patch] i386: fix one case of stuck dwarf2 unwinder II

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Message-Id: <200608071004.37849.ak@suse.de>
Date:	Mon, 7 Aug 2006 10:04:37 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Jan Beulich" <jbeulich@...ell.com>
Cc:	"Chuck Ebbert" <76306.1226@...puserve.com>,
	"Jesper Juhl" <jesper.juhl@...il.com>,
	"Andrew Morton" <akpm@...l.org>, "Dave Jones" <davej@...hat.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [patch] i386: fix one case of stuck dwarf2 unwinder II

On Monday 07 August 2006 10:00, Jan Beulich wrote:
> >> Yes that's the problem. If you check for <= stext/_stext then the unwinder
> >> won't catch the L6 (which is above it) and report a "stuck" again
> >
> >Maybe I'm being dense here, but:
> >
> >c0100210 t L6
> >c0100212 t check_x87
> >c010023a t setup_idt
> >c0100257 t rp_sidt
> >c0100264 t ignore_int
> >c0100298 T stext
> >c0100298 T _stext
> >
> >It looks like L6 is before _stext to me.
> 
> So it would seem to me. Nevertheless, in my opinion the proper fix is to annotate the call site
> (in head.S) to specify a zero EIP as return address (which denotes the bottom of a frame).

Can you please send a patch to do that?

That seems to be missing in some other places too, e.g. i386 sysenter path, x86-64 kernel_thread,
more?

-Andi

 
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