linux-kernel - Re: Was: boot failure, "DWARF2 unwinder stuck at 0xc0100199"

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Message-ID: <200609010615_MC3-1-C9FA-ECE6@compuserve.com>
Date:	Fri, 1 Sep 2006 06:12:51 -0400
From:	Chuck Ebbert <76306.1226@...puserve.com>
To:	Badari Pulavarty <pbadari@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Jan Beulich <jbeulich@...ell.com>,
	Andrew Morton <akpm@...l.org>
Subject: Re: Was: boot failure, "DWARF2 unwinder stuck at 0xc0100199"

In-Reply-To: <1157049193.22667.19.camel@...9047017100.beaverton.ibm.com>

On Thu, 31 Aug 2006 11:33:13 -0700, Badari Pulavarty wrote:

> As you can see from the following stack - it shows 
> 
>       msync_interval() -> 
>               set_page_dirty() -> 
>                       __set_page_dirty_buffers()
> 
> But actual trace is (looking at the code):
> 
>       msync_interval() -> 
>               msync_page_range() ->
>                  msync_pud_range() -> 
>                     msync_pgd_range() ->
>                        msync_pte_range() ->   
>                               set_page_dirty() -> 
>                                       __set_page_dirty_buffers()
> 
> Why is it skipping all msync_page/pud/pgd/pte_range() routines ?

Sometimes this is caused by tail calls, i.e. when the last line
of a function calls another function it can many times be optimized
into a jump.

You can disable this by compiling with CONFIG_FRAME_POINTER=y.

-- 
Chuck

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