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

[Chuck Ebbert]

In-Reply-To: <1157049193.22667.19.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>

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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