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From: Alexandra Yates <alexandra.yates at linux.intel.com>
Subject: Re: [Powertop] close_display() sigsegv
Date: Thu, 20 Nov 2014 17:06:32 -0800
Message-ID: <51714.10.24.1.226.1416531992.squirrel@linux.intel.com>
In-Reply-To: CAG27Bk0_Aur0GxHEC=T6zD+o9zLHigiNvwajUB-yJtXOupRcaA@mail.gmail.com
To: powertop@lists.01.org
List-ID: <powertop@lists.01.org>

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> On 20 November 2014 19:47, Alexandra Yates
> <alexandra.yates(a)linux.intel.com> wrote:
>
> Hi Alexandra,
>
>> Followed all steps, in two platforms still cant reproduce.  (Difference)
>> I'm running Ubuntu.
>
> I just reproduced the issue with g++, without CFLAGS, or anything in
> environment that I could tell would effect to compilation. Backtrace
> is pretty similar.
>
> (gdb) bt full
> #0  0x000000000040a14e in _M_lower_bound (this=3D<optimized out>,
> __k=3D<error reading variable: Cannot access memory at address
> 0xffffffffffffffe8>, __y=3D0x477368 <tab_windows+8>, __x=3D0x363e930)
>     at /usr/include/c++/4.9.2/bits/stl_tree.h:1260
> No locals.
> #1  lower_bound (__k=3D<error reading variable: Cannot access memory at
> address 0xffffffffffffffe8>, this=3D0x477360 <tab_windows>) at
> /usr/include/c++/4.9.2/bits/stl_tree.h:927
> No locals.
> #2  lower_bound (__x=3D<error reading variable: Cannot access memory at
> address 0xffffffffffffffe8>, this=3D0x477360 <tab_windows>) at
> /usr/include/c++/4.9.2/bits/stl_map.h:902
> No locals.
> #3  operator[] (__k=3D<error reading variable: Cannot access memory at
> address 0xffffffffffffffe8>, this=3D0x477360 <tab_windows>) at
> /usr/include/c++/4.9.2/bits/stl_map.h:496
>         __i =3D <optimized out>
> #4  close_display () at display.cpp:93
>         i =3D 5
> #5  0x0000000000411e5e in clean_shutdown () at main.cpp:378
> No locals.
> #6  0x0000000000406d6d in main (argc=3D1, argv=3D0x7fff51015798) at
> main.cpp:519
>         option_index =3D 0
>         c =3D <optimized out>
>         iterations =3D 1
>         filename =3D '\000' <repeats 2928 times>...
>         workload =3D '\000' <repeats 4095 times>
>         auto_tune =3D 0
>
> Maybe comparing my config.log with your will give a hint what could be
> going on.
>
> http://ut3.org/~kerolasa/config.log.gz
>
>> I will revert the culprit commit.  I would appreciate you testing again.
>
> I think the line below should be removed as well.
>

Where you able to test that you issue is resolved without these lines?

> main.cpp: In function 'void clean_shutdown()':
> main.cpp:378:16: error: 'close_display' was not declared in this scope
>   close_display();
>
> --
> Sami Kerola
> http://www.iki.fi/kerolasa/
>



Thank you,
Alexandra.

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