debugging gdb

debugging gdb

[Maik Beckmann]

Hello,

gdb-archer segfaults on me at a certain point in my source code.  To give a 
proper bug report I did wanted to get a backtrace.  So I did
  ulimit -c unlimited
to get a core dump.

However, I all I get by running my systems gdb-6.8 on the core file
  gdb --core=core
is
{{{
$ gdb --core=core
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
(no debugging symbols found)
Core was generated by `/home/maik/abs/gdb-archer/src/gdb-archer/build/gdb/gdb 
--annotate=3 pong'.
Program terminated with signal 11, Segmentation fault.
[New process 21841]
#0  0x0000000000633ff4 in ?? ()
(gdb) bt
#0  0x0000000000633ff4 in ?? ()
(gdb)
}}}

Can you guys give me a hand on how to move forward from here?


Thanks,
-- Maik

PS: I configured archer with
{{{
  export CFLAGS=" -g -O1 "
  export CXXFLAGS=" -g -O1 "
  ../configure --enable-debug \
      --prefix=/usr \
      --disable-nls \
      --mandir=/usr/share/man \
      --disable-werror \
      --infodir=/usr/share/info
}}}
ran make but didn't install it.

Re: debugging gdb

[Daniel Jacobowitz]

On Mon, Jun 22, 2009 at 08:48:01PM +0200, Maik Beckmann wrote:
> Hello,
> 
> gdb-archer segfaults on me at a certain point in my source code.  To give a 
> proper bug report I did wanted to get a backtrace.  So I did
>   ulimit -c unlimited
> to get a core dump.
> 
> However, I all I get by running my systems gdb-6.8 on the core file
>   gdb --core=core

Give GDB a binary, in addition to a core file.  It'll do much better.

-- 
Daniel Jacobowitz
CodeSourcery

Re: debugging gdb

[Maik Beckmann]

Daniel Jacobowitz schrieb am Montag 22 Juni 2009 um 20:53:
> On Mon, Jun 22, 2009 at 08:48:01PM +0200, Maik Beckmann wrote:
> >
> > However, I all I get by running my systems gdb-6.8 on the core file
> >   gdb --core=core
>
> Give GDB a binary, in addition to a core file.  It'll do much better.

Oh boy,  sorry for being stupid.
 
Thank you,
--Maik


PS: output
Core was generated by `/home/maik/abs/gdb-archer/src/gdb-archer/build/gdb/gdb 
./pong'.
Program terminated with signal 11, Segmentation fault.
[New process 24461]
#0  0x0000000000633eaf in d_print_comp (dpi=0x7fff1e3310b0, dc=0x2734c28) at 
../../libiberty/cp-demangle.c:3271
3271            d_append_buffer (dpi, dc->u.s_name.s, dc->u.s_name.len);