AW: segmentation fault of dynamic executables with ld-uClibc.so.0 from0.9.29 on mipsel

[Joakim Tjernlund]

On Fri, 2007-06-01 at 08:42 +0200, Carsten Lange wrote:
> I used LD_DEBUG=all ./app but nothing was shown at all.

And you had enabled SUPPORT_LD_DEBUG in uClibc?

> Investigating the code shows that this functionality is disabled for
> __mips__ anyway.
> ... snip from dl-string.h
> 
> /* The following macros may be used in dl-startup.c to debug
> 
> * ldso before ldso has fixed itself up to make function calls */
> 
> /* On some (wierd) arches, none of this stuff works at all, so
> 
> * disable the whole lot... */
> 
> #if defined(__mips__)
> 
> # define SEND_STDERR(X)
> 
> # define SEND_ADDRESS_STDERR(X, add_a_newline)
> 
> # define SEND_NUMBER_STDERR(X, add_a_newline)
> 
> #else
> 
> ... snap
> 

These are only used if SUPPORT_LD_DEBUG_EARLY is set and is used for
very early debug.

>  
> Using gdbserver is not easy because I have to link it static. I will
> set up such debug environment
>  
> I hoped that someone has run into the same problem and has found the
> reason/workaroug for this.
>  
> Carsten
>  
>         -----Ursprüngliche Nachricht-----
>         Von: Joakim Tjernlund [mailto:joakim.tjernlund at transmode.se]
>         Gesendet: Donnerstag, 31. Mai 2007 23:31
>         An: Carsten Lange; uclibc at uclibc.org
>         Betreff: RE: segmentation fault of dynamic executables with
>         ld-uClibc.so.0 from0.9.29 on mipsel
>         
>         
>         Try enabling SUPPORT_LD_DEBUG and run:
>         LD_DEBUG=all ./app
>          
>         you could try using gdb as well
>         
>                 
>                 ______________________________________________________
>                 From: uclibc-bounces at uclibc.org
>                 [mailto:uclibc-bounces at uclibc.org] On Behalf Of
>                 Carsten Lange
>                 Sent: den 31 maj 2007 11:02
>                 To: uclibc at uclibc.org
>                 Subject: segmentation fault of dynamic executables
>                 with ld-uClibc.so.0 from0.9.29 on mipsel
>                 
>                 
>                 
>                 Hi all, 
>                 I used buildroot to build 3 toolchains for mipsel with
>                 different uClibc versions and same versions of
>                 binutils and gcc: 
>                 
>                 binutils version 2.17
>                 gcc version 4.1.2
>                 kernel-headers 2.4.25
>                 uClibc versions
>                 0.9.28
>                 0.9.28.3
>                 0.9.29 
>                 I discovered that dynamically linked executables do
>                 segfault when I use 0.9.29.
>                 uClibc version 0.9.28 and 0.9.28.3 are working fine.
>                 When I copy ld-uClibc.so.0 from uClibc version 0.9.28
>                 and 0.9.28.3 onto the target replacing the
>                 ld-uClibc.so.0 from 0.9.29 everything works fine as
>                 well.
>                 
>                 Any help is very much welcome! 
>                 Carsten 
>                 
>                 
>                 
>